Brings back many happy memories Matt. First bike at 17 in 197?. First bike I ever worked on properly - because it had to work well enough to get me to work. First bike I ever tuned - with a lot of advice from my Dad. He was brilliant with all types of engines, even ones he'd never seen before. Following my Dad's advice to the letter, I polished the inlets, outlets, combustion chamber and piston crown. Then I reseated the valves. And just as I was ready to put the bugger back together, my Dad asked how much slack there was in the cam chain tensioner. He said he was concerned I might have reduced the compression ratio a bit. We both knew he was joking. At the strip down stage we had already established there was a ton of clearance between the open valves and the piston crown - by putting little lumps of plastacene on the piston. This was the beginning of turning my 1968 C50 into a Fizzer beater. We set off first to the glass wholesaler to get a few squares of thick float glass. Then to the panel beaters and paint spray suppliers to get a few grades of Emery cloth and coarse wet and dry. The plan of course was to remove 1mm from the head. Not an easy task to do accurately using this method, but it had worked on a pushrod Velocette several decades before, we saw no reason why it shouldn't work now. A few hours later it was done. I washed the head in paraffin and petrol to get rid of all traces of grit. The rebuild began on the Sunday morning. The adjustments to the timing were done by lunch, and the engine was back in and re-lubed by tea time. The baffle came out of the back of the silencer, and the brakes were looked at. Oh and I played with the carb settings a bit to get it to run just right. Result? Slightly harder to start, from cold smoother running, Much improved acceleration, a healthier noise and about 5-6mph on the top end. Depending upon who's speedo you believed, after downward adjustment, this meant 55-58mph! I had mates with YDS7, Suzi 250d, BSA Starfire, and all the mopeds of the day from Honda SS50s and Yam FS1Es, to Puch the more exotic Gileras and Fantic etc. They called me a gay old man for riding a Honda step through. But I beat nearly all of them. The Gilera was very quick though, as was another Italian or Spanish thing I can't recall the name of. Morbidelli? That was essentially a race bike. Best engine ever made. And yes, of course the fucking points go in there! Have you never worked on a '70s Honda before? Build it into a lightweight frame and race the bugger ;)))
When i was about 12, I had an old C90 we used to rag around fields etc, it was permanently stuck on full throttle (didnt know how to fix carbs back then lol) so we just used the key to control it. One day my mate was on it, flat out across a field with a big ditch at the end, just before meeting a road. The key popped out of the ignition as he was doing about 50 towards the ditch, he bailed off and Ghostied the bike into the ditch, it hit the other side so hard it snapped in half and the engine flew about 15 feet in the air. Always had more fun on banged up old mopeds than anything else.
Hey Matt, here's a story for ya. As a newbie biker of only 2 years experience it has dawned on me that my YZF (that has been active all year round and lives in the rain,) is falling apart faster than I can afford to fix it. Cue youtube to the rescue and after an intense 3 days of binge watching I took my first steps in bike mechanical maintenance... I bought tools. I cleaned my brake calipers, followed by bleeding the brakes. I gave myself a hearty slap on the back for a job well done and being all manly and shit. Then I found your channel, did more research and realised that Tomorrow I'll be taking those calipers off again to remove the copper grease. Cheers Del. Seriously though Matt. Thanks for clearing that up. The Legend of copper grease runs deep. Everywhere tells you to use it.
Marketed to hell in every consumer parts store, hint its for the 18+ wheeler croude to make it through weigh station inspections. and it takes buckets of it to mask faults. Strange they don't have it at the truck stops, or not.
Many many years ago, (the 80's) when boys were still tort mechanical design and engineering in high school as a matter of course, are teacher told us that the Honda Cub engine was the greatest peace of engine design ever. He then when on for the hole two hour lesson to tell us, in minute detail, exactly why as he dismantled one. As, at the time, I was a teenager who was constantly devising new and interesting ways to get a detention on the same day as D.E., I didn't listen to a word of it. Why did I want detention? Miss Chan and the chance to glimpse a stocking top. Thursday's detention was always very popular with the boys!
I've got a late '69 engine out of a ct90 I ended up replacing with a ATC125 engine. That cover on the head is for the points/cdi pick up on later models.
I've got a 1964 Cub C100 (50cc, pushrod) in the garage. It's a little jewel. 6v electrics, happily starts with a flat battery. I must take it for an MOT and then ride it around just to make me smile.
If they'd put copper grease on the valve seats and the cast iron rings it would still be running. Maybe there is a market for "Sea Foam, now with copper grease!"
They put these engines in so many different frames, I rode a CT70 and then an ST90, both had basically that engine, just with different displacement and gearing. They're as bulletproof as the early XL/XR engines, my friends and I ran the CT, ST, and an 83' XL124s hard for years and they never gave us problems like the newer bikes we got later. Honda used to make some seriously hard to break stuff.
Hope this tear down continues, I have 4 of these (2x125’s & 2x90’s) for my grandsons speedway bikes, albeit Chinese clones, of which there are probably more of than there are Honda’s
One of the most reliable motorcycle engine designs out there! Me and my old man rebuilt a Honda Mini-trail 50cc engine because it was tired and low on power (it still ran) and on inspection we found that the oil pump had seized and the timing chain had worn away half the oil pump drive sprocket!!! We couldn't afford genuine gaskets so we cut out some gaskets from a cereal box and they worked fine for the rest of the time I had the bike with no leaks and we even took the bike around Australia for 4 months with us when I was a kid :) That bike has been through multiple generations of kids and adults and is still probably running to this day :) Such amazing reliable engines and if you've ever had one or worked on one I'm sure you'd agree :) P.S. Under that cover was the points plate and behind that a mechanical ignition advance cam runs on the camshaft with weights that throw out as the engine increases revs and it changes the cam position which in turn changes when the points open and close advancing the ignition timing.
Amazing intro!;) ....I hate regular screws on engines. Had an engine once, and I wanted to take the clutch cover off... all screws were destroyed (before I got it). I need a hammer impact screwdriver thingy.. I want hex stuff on an engine. Everywhere.
Mines a 1983 C90G, one of the very 1st 12v models and the very last exported ones made in Japan. Just thought I'd throw out a bit of what i know about these engines for anyone whos interested. -The C90E designation is just an iteration and doesn't mean economy. Also the letters aren't done in any particular order. -All the engines originally have one copper washer in the bottom left cylinder stud while the rest are steel (not sure why). -Some engines had the points on the side of the cylinder head but as far as I know a lot more of them had them in the left hand stator area. -Later model camshafts for the 12v ones used ballbearings instead of plain bearings.
"-All the engines originally have one copper washer in the bottom left cylinder stud while the rest are steel (not sure why)." - this will be the head oil feed one, don't know why I didn't put 2 and 2 together. "-Some engines had the points on the side of the cylinder head but as far as I know a lot more of them had them in the left hand stator area." - After reading up a little, this model has a cdi (missing) so the points weren't needed. Wait till you see the stator LOL
bulletproof design, and the C50 was the first bike I popped a wheelie on ! (and the first bike i was pulled over on..."Barry Sheene are we....In a hurry are we sir....")
I was been tongue in cheek lol proper engine no mamby pamby electronics crap. and basically just about every other 4 stroke bike engine from the 70 onwards is based on it just more cylinders more gears and a proper clutch oh and then extra cam shafts. as a footnote i used to have a 65 honda 50cc that had pushrods not an overhead cam.
aw i was going to practice with you so dell boy can make it up to you lol. im pissing my self with laughing watching you grapple with that wonderful piece of engineering. i got that good with em i could take one apart and re-aasmble to working in 20 mins
Hi Josh lots of folks have done what you propose and some made it commercially. Big hint instead of of lethal lithium battery packs try banks of capacitors as well they store far more energy or maybe even a combo. you haver to remember there are mega vested intrest in pushing battery power.
4:07 and 15:22 That stud does feed oil to the top end. It originally had the domed nut at the top along with the copper washer to seal the oil. The missing part in the section you removed before getting to the cam chain is the automatic timing advance mechanism.
The Workshop longer is good when there's stuff happening, the theoretical stuff could do with shortening or done in parts. I think that would suit viewers and your watch time better.
I thought everyone into motorcycles have or had one. I had many. My 1969 trail 90 blew the plug out of the head on a long trail ride and i hammered a block of wood in between the head and plug. It survived for a year that way until (I as a poor 11-12 year old who had to pay my own way) could rebuild the engine. I bet it would of lasted longer hahaha.
When rebuilding make sure you get the right piston. Honda have many different shaped domes/heads for those c90 engines. I have been caught out before with a ct90 when running the piston was slightly hitting the head.
Back in 1995 my best mate brought a crunch 90 off another mate for 10 Lambert and butler and a teenth!! ....oh to be 15 again with contraband as currency!
Yeah boy awesome video mate, those Honda 90 and 110cc engines are great. Can't wait for part two. Id love to see you tear down and rebuild a Yamaha YZF/WRF 400/426/450 engine, I love that Yamaha five valve engine.
Those engines were almost bullet proof, one of the first bikes I road was an early 70's CL70. we had a shop full of the mid to late 60's and early 70's of those style of engines ranging from 60cc up to 70cc. Bunch of kids I knew had the old trail 70cc and 90cc bikes.
What could it mean if i can’t feel any air displacement from the spark plug hole whilst kicking it? I’m thinking about getting this cub working but Not sure how much work it is
You could get a pitbike roller cheap to bolt the motor in to. I use to have a road legal 120 pitbike did about 50mph flat out good fun on the back roads
Those marks on the camshaft may have been from someone trying to hold it with a pipe wrench while trying to crack the timing chain gear bolts loose. Pro tip, use the impact gun for those bolts. They'll back right out without trying to rotate the cam gear.
That looks like a pretty big combustion chamber for 90cc. Now I'm quite curious what the static comp-ratio is on these, maybe one of the key reliability features is that hemi along with a rather low compression ratio.
Good practice to place a cloth under the engine so screws dont bounce on the floor. Stuck gaskets: use a razor blade to cut the paper at least 1/2 way round then tap a thin screwdriver in to separate the cap. Use magnetic trays to keep track of parts.
@@dirtygarageguy because it gouges the aluminum? That only happens if your fingers are numb and you cant see fer shit. Ya got to have fine motor skills of a surgeon sometimes. i have tapped in the blade of a pen knife edge long and it worked fine.
Very true and I get ya. But you have to look at this from my point of view. The moment I do that then kids/newbies to this say 'well matt stuck a screwdriver in' and fuck their cases. So I have to 1) not do that 2) don't pass that on 3) disagree with the any mention of it LOL if you get what I mean.
Tough? We wired one wide open in neutral and left it, it stopped after 45 minutes but only because the wiring to the ignition melted, we stripped it down and mechanically it was still golden.
Fuckin' love the cub. First "real" motorbike I ever had, passed my test on it. Remember going to the MCN bash in Peterborough back in the 80s, they had a competition to win - umm - fucked if I can remember, some sportbike or other, but the competition involved a cub with all the oil drained out of it, you got 10 minutes thrashing the thing round a field and the one who melted it won the prize. It lasted 2 days of fat cunts running it flat out with no oil. Mine broke down on the A4 once, I got towed 40 miles by a madman on a Z900. Rope on the bars, hang on for dear life. Fastest the damn thing ever went, but not an experience I want to relive.
quick question about boxer engines or engines laying over like this. does one side (bottom side closest to the ground) of the piston/rings wear out a bit faster?
Honda has built over 100 Million CK-90 or Cub motorbikes There is a Man from the UK has TH-cam channel CK-90 Adventure has ridden CK-90's all over the World rebuilds them on the side of the road. I took a 1972 Honda SL 125 motor .. bored & stroked to 160 CC's Powroll ported the head reground cam shaft .. I used the 24 MM Mikuni off from my GYT Kit Yamaha 80 then I put that motor into a 1977 Honda CR 125 frame .. about two years after I build my 4 stoke Dirt Bike Honda came out with the XR-200 4 valve head shorter stroke bigger bore more high rpm motor .. My points ignition has no spark .. I am looking for a CDI for it .. I had to run a battery as it is now ..
Nice stuff. Loving the greasy bits. Seeing those marks on your cam makes me a bit sad. When I did the rebuild on an m20b20 engine some dickhead also previously worked on the rocker shafts with a wrench. Those shafts and rockers were an absolute pain to remove because of the scoring.
Couldn't agree with you more i was lucky and grew up through all the great changes good and bad i even defected to racing rice burners i was much more competitive even won a formula 5 championship with a very very highly modified RD400 used to make tz 350 look like they where going backwards. Thing is matt now the old British bikes and marque are much in vogue these days so maybe the lazy old twats are having the last laugh
More to do with outdated tooling and selective fit construction, rather than the Japanese quality control. Arrogance did play a part yes. The sohc 750 was the nail in the coffin.
No doubt syncmaster2015. The same speed for less money and no oil leaks. List everything from the BSA Bantam to the big boys, EVERYTHING, Honda did began with this engine! Check out the Velocette LE styling, but vastly improved and lightened.
what bit was on the impact? Got some simmulair fucked screws on the sprocket cover of the GS500 i recently bought, wanna try to get them out decently before going to drilling them out. Cause that bit seems to work magic! Also looking forward to the other parts!
hemi? PERK!!! LOL, I pulled one of these apart for a coworker in the late 70's, who bought it from a guy who assured him it ran, when he dropped it off and told him the thing was seized he asked me to do what i can, well when I pulled the cylinder off, the piston came off with it, the rod had snapped at the wrist pin when the piston was at tdc and totally wrecked the case, looked as if it had never seen a drop of oil (oiling hole was never drilled in the piston rod) I think we paid like $25? for a replacement used engine/w wrecked bike included ;-) from a local junker, that thing got him to work for years! almost 30 miles a day
Yeah its gonna happen - we've been pissing around with his moped recently and these recent videos were recorded when I was on holiday and Isaac was a college
I had a mustard/beige 90 and a blue 70, i used to go for miles on my 70, my first road bike was a Honda ss50 when i was 16, have you seen the street cub builds?
The points, or CDI trigger in the case of the Xl185 I had which had a similar head) shoud've been under that cover, someone's removed it & not put it back.
@@dirtygarageguy It went into my local bike shop for a new clutch, then on the way home it kinda siezed as it got warm then released, i took it back then a day later they gave me it back and it did it again. Back and forth again then it started to smoke lots at higher engine speed. I've since took it to a different shop and it's having a rebore etc... You seem to know exactly what you're doing and wondered if you fancied having a look at it, but sorted now, thank you. All the best...
Did you know that Jawa took Honda to court in 1966 because Honda had exactly copied and produced the automatic clutch / gear (Blatant patent infringement)?? In 1966 the world's biggest motorcycle manufacturer with Honda then second so it was the big boys going head to head in court. The case created a legal precedent and is referred to as "The Case of the Clutch - Jawa versus Honda" in law books. In the end Honda apologised and settled out of court agreeing to pay royalties to Jawa for every motor Honda sold with the Jawa system installed. Since then Honda and Jawa have become friendly and their engineers have collaborated on various research projects. One example is the Honda DN01 automatic cruiser motorcycle that saw the Czech engineers who created the Babetta 50cc 2 speed fully automatic self shifting gearbox working for Honda R&D. (Something for the Workshop to explain, though the Del Boy version would have more comedy value.....) I've rebuilt Honda Cub motors in the past and they're quite mechanic friendly. With a friend, we designed a sliding camshaft tapered cam lobed variable valve timing prototype on a Honda C90 engine back in 2004, approached General Motors and were told in a letter that, "GM can see no requirement or future in variable valve timing 4 cycle engines". When Suzuki announced a very close but inferior system 2 years later we gave up. Ours was better though as it used a cyclic rack instead of a second shaft and guide forks.
"Did you know that Jawa took Honda to court in 1966 because Honda had exactly copied and produced the automatic clutch / gear (Blatant patent infringement)??" - No I didn't very interesting
I remember the press stuff every one laughed and scorned Jawa at the time .Thinking that some eastern block country couldn't possibly be that clever and be much smarter than the Japanese. David and Goliath allways springs to mind
I love. The. Honda motor own a early 60s S90. I beleive the engine is listed in World records as the Worlds most produced small engine of all time mine is actually on the original motorcycle. That has been stored indoors since the sixties as my Dad bought the bike but did not ride it as he intended to ?
Two questions. 1. What's a torque gun? It sounds different to an impact driver / wrench. 2. What kind of bit did you use in it? Or was it just an Easy Out type thing?
"1. What's a torque gun? It sounds different to an impact driver / wrench." - LOL same thing. "2. What kind of bit did you use in it? Or was it just an Easy Out type thing?" - JIS number 2
One of these tried to kill me back in the 70's.the engine maybe brilliant but the bikes they put them in weren't,the Honda trail 90 I was riding(not my bike)has no real suspension in front despite the word trail on the bike.i tried to jump over a small ditch at say 40mph.worst beating i ever took.the bike was fine though LOL.
Someone's nicked your ignition. There should be points, points cam etc under that left hand cover on the head. Get a socket adapter for your rattle gun. It would have made short work of those timing sprocket bolts. At one point I had about half a dozen 50s and 70s. Over time the auto clutches wear and start sticking. One I had was pretty bad so I ended up converting it to a normal hand clutch with mostly just basic workshop tools, apart from the release fork I made up which I had to weld. It worked rather well. The only issue was a bit of an oil leak as I didn't have a proper oil seal where the release pivot came out through the clutch cover.
"Someone's nicked your ignition. There should be points, points cam etc under that left hand cover on the head." - The C90e had a CDI, hence why the points are missing. "Get a socket adapter for your rattle gun. It would have made short work of those timing sprocket bolts." - I have, that's what's on the end of the gun.
"The C90e had a CDI, hence why the points are missing." I'm pretty sure the CDI C90s have a different cam sprocket cover, without the points stuff. There's no point having a double cover with an oil seal if you don't need it. They also have more wires coming out from the alternator. Points ran from the battery, CDI had extra windings on the alternator. Yes, I am sad enough to remember this shit. If yours truly was CDI it must have been some odd transition model.
"There's no point having a double cover with an oil seal if you don't need it." - I believer this was the first year of switch over to CDI and generally what Honda did was to make the same engine (use the same tooling for the injection moulding) just mitigate the points. After all was good they then redesigned and re-tooled for the upgraded engine - but this isn't gospel.
OK, I did a bit of research and as I thought yours is a 6V points model. Only the later 12V had CDI. That engine was quite a bit different. The engine number does not correspond to the model number so just to be confusing C90E engine numbers were before the C90E model. You only have 3 wires coming from the alternator - gnd, battery charge and headlight (6V were direct lighting). If there is no timing trigger from the alternator it must come from points. Oh, by the way another hint is the bolt in the end of the camshaft - it's to hold the advance mechanism in place.
jompa zx they are actually JIS (Japanese industry standard) screws. Most people use 'Philips' type drivers on them, that don't fit properly and bugger them up!
Clutch isn't centrifugal, it's operated by the gear shift, as the gear shift linkage moves, it engages/disengages the clutch Copper washer is on one head bolt, as it's to seal the oil gallery from the oil pump to the head That's a 6v engine so it's has points on the head. Later 12v engines have CDI ignition with a trigger coil on the flywheel. Are you using a JIS screwdriver bit? Honda use JIS not Philips, Philips/Posidrive cam out in JIS fasteners. That's not the cam chain tensioner, it's the guide sprocket, the tensioner is next to the oil drain on engines with the hydraulic tensioner. Fin rot on the bottom of the cylinder is normal, doesn't mean water has got in the engine, it's caused be road muck spraying on the bottom of the cylinder.
I was making food for a vegetarian friend of mine yesterday and when cooking instead of thinking "wait, vegetarian or vegan?" while reaching for butter, my brain went "is butter meat?"
Those "Phillips" screws aren't actually "Phillips" rather JIS screws. JIS is the Japanese version of screws and drivers. Over years of people mistakenly using Phillip's head tools on them...they strip.
It's probably been said but I can't be arsed to read it all. That's not a c90e engine, it's a c90zz. The e. Is electronic ignition and at 87cc not the 89.5 of the 90z. The z engine was really only used on the ct90 and the c90z. The points cover on the end of the cam is the give away! Got one in the garage I'm working on atm.
It's an "E" code engine but it's not out of a c90E. It's out of a C90Z. I just checked mine to be sure and it's an "E" code engine. It doesn't stand for economy or anything. It's just the code letter.
I'm not arguing - I just read this - The C90-E models, also known as the 'Super Cub' or 'Economy' models, are largely the same as the -C models but feature heavily revised cycle parts with more angular styling and are fitted with larger, rectangular flashing indicator lamps and head lamps; a fuel gauge is fitted and the handlebar controls improved. 4-stroke.net/library/identification/how-to-identify-a-honda-c90 I'll have to check the serial number....
yup thats the later model. i have a "z" made in '81 i'm restoring atm. they were the last of the round headlight/points ignition models using te engine out of the ct90 trail. the engine itself isn't the same dimensions as a pit bike motor either as they are based on the models with the ignition behind the flywheel. :)
I have a c90 with an inspection sticker from 1968. It ran and would drive but after about 2-3 minutes it would get hot as hell and start knockin like hell. I have taken it to a few people and they dont know whats up with it. I am planning to tear it down and rebuild it. Im using your video as reference. Would be happen to share pics with you to compare as you mentioned in this video
Put some thicker synthetic oil in it to cushion all the worn out bearings a little bit better. Is the head and cylinder painted? If it is that's part of your problem depending how thick the coats are.
That's a c90zz engine or earlier. The later cub90 engine is a bored and stroked c50 engine. The zz engine is a proper 90. My mate races a zz and we race a cub. You can make an Indian royal enfield electronic ignition work on them. They convert to 12 volt dead easy. The very early 90 engines have a slightly different gearbox and a note on the side of the engine for different oils to use for different temperatures.
I didn't know the difference when we started. Having ridden loads of them over the years. The round headlamp one's are usually z engines one's like the one you have. The square headlight one's like ours have the 50 based engine which is lighter and slightly faster but not as well built. The Chinese 110 engines are based on the cub engines, so almost all of the tuning parts you can buy are for that style engine. Which is why most people run them. Do you want me to see if we have the missing points and advance bits you are missing from that engine?
in the presence of greatness lol! i grew up on these old honda engines i love them. ya your missing the points set up that runs off the cam. newer ones turned to cdi with a timing adjuster on the cam its a pretty cool set up
yeah!!! i need to repair one is detroyed and abondoned sooo thanks and dont dare left the serie video whithout finish! sorry mi englhis still a really crap state.
Brings back many happy memories Matt. First bike at 17 in 197?. First bike I ever worked on properly - because it had to work well enough to get me to work. First bike I ever tuned - with a lot of advice from my Dad. He was brilliant with all types of engines, even ones he'd never seen before.
Following my Dad's advice to the letter, I polished the inlets, outlets, combustion chamber and piston crown. Then I reseated the valves.
And just as I was ready to put the bugger back together, my Dad asked how much slack there was in the cam chain tensioner. He said he was concerned I might have reduced the compression ratio a bit. We both knew he was joking.
At the strip down stage we had already established there was a ton of clearance between the open valves and the piston crown - by putting little lumps of plastacene on the piston. This was the beginning of turning my 1968 C50 into a Fizzer beater. We set off first to the glass wholesaler to get a few squares of thick float glass. Then to the panel beaters and paint spray suppliers to get a few grades of Emery cloth and coarse wet and dry.
The plan of course was to remove 1mm from the head. Not an easy task to do accurately using this method, but it had worked on a pushrod Velocette several decades before, we saw no reason why it shouldn't work now.
A few hours later it was done. I washed the head in paraffin and petrol to get rid of all traces of grit. The rebuild began on the Sunday morning. The adjustments to the timing were done by lunch, and the engine was back in and re-lubed by tea time. The baffle came out of the back of the silencer, and the brakes were looked at. Oh and I played with the carb settings a bit to get it to run just right.
Result? Slightly harder to start, from cold smoother running, Much improved acceleration, a healthier noise and about 5-6mph on the top end. Depending upon who's speedo you believed, after downward adjustment, this meant 55-58mph!
I had mates with YDS7, Suzi 250d, BSA Starfire, and all the mopeds of the day from Honda SS50s and Yam FS1Es, to Puch the more exotic Gileras and Fantic etc. They called me a gay old man for riding a Honda step through. But I beat nearly all of them. The Gilera was very quick though, as was another Italian or Spanish thing I can't recall the name of. Morbidelli? That was essentially a race bike.
Best engine ever made. And yes, of course the fucking points go in there! Have you never worked on a '70s Honda before? Build it into a lightweight frame and race the bugger ;)))
When i was about 12, I had an old C90 we used to rag around fields etc, it was permanently stuck on full throttle (didnt know how to fix carbs back then lol) so we just used the key to control it.
One day my mate was on it, flat out across a field with a big ditch at the end, just before meeting a road. The key popped out of the ignition as he was doing about 50 towards the ditch, he bailed off and Ghostied the bike into the ditch, it hit the other side so hard it snapped in half and the engine flew about 15 feet in the air.
Always had more fun on banged up old mopeds than anything else.
Lmao
Sounds like something we would’ve done as kids.
Hey Matt, here's a story for ya.
As a newbie biker of only 2 years experience it has dawned on me that my YZF (that has been active all year round and lives in the rain,) is falling apart faster than I can afford to fix it.
Cue youtube to the rescue and after an intense 3 days of binge watching I took my first steps in bike mechanical maintenance...
I bought tools.
I cleaned my brake calipers, followed by bleeding the brakes.
I gave myself a hearty slap on the back for a job well done and being all manly and shit.
Then I found your channel, did more research and realised that Tomorrow I'll be taking those calipers off again to remove the copper grease.
Cheers Del.
Seriously though Matt. Thanks for clearing that up. The Legend of copper grease runs deep. Everywhere tells you to use it.
Marketed to hell in every consumer parts store, hint its for the 18+ wheeler croude to make it through weigh station inspections. and it takes buckets of it to mask faults. Strange they don't have it at the truck stops, or not.
Many many years ago, (the 80's) when boys were still tort mechanical design and engineering in high school as a matter of course, are teacher told us that the Honda Cub engine was the greatest peace of engine design ever. He then when on for the hole two hour lesson to tell us, in minute detail, exactly why as he dismantled one.
As, at the time, I was a teenager who was constantly devising new and interesting ways to get a detention on the same day as D.E., I didn't listen to a word of it.
Why did I want detention? Miss Chan and the chance to glimpse a stocking top. Thursday's detention was always very popular with the boys!
case of form over function lol and hormones
It's the most successful, most produced vehicle engine in history. He was right. en.wikipedia.org/wiki/Honda_Super_Cub
I've got a late '69 engine out of a ct90 I ended up replacing with a ATC125 engine. That cover on the head is for the points/cdi pick up on later models.
I've got a 1964 Cub C100 (50cc, pushrod) in the garage. It's a little jewel. 6v electrics, happily starts with a flat battery. I must take it for an MOT and then ride it around just to make me smile.
When your rebuilding don't forget to use copper grease on the crank bearings and cylinder walls to stop squeals!!
If they'd put copper grease on the valve seats and the cast iron rings it would still be running. Maybe there is a market for "Sea Foam, now with copper grease!"
James Lerch your a fucking genius!
the only squeals will be matt when he traps his fingers or drops the timing chain when re assembling lol
They put these engines in so many different frames, I rode a CT70 and then an ST90, both had basically that engine, just with different displacement and gearing. They're as bulletproof as the early XL/XR engines, my friends and I ran the CT, ST, and an 83' XL124s hard for years and they never gave us problems like the newer bikes we got later. Honda used to make some seriously hard to break stuff.
Hope this tear down continues, I have 4 of these (2x125’s & 2x90’s) for my grandsons speedway bikes, albeit Chinese clones, of which there are probably more of than there are Honda’s
One of the most reliable motorcycle engine designs out there! Me and my old man rebuilt a Honda Mini-trail 50cc engine because it was tired and low on power (it still ran) and on inspection we found that the oil pump had seized and the timing chain had worn away half the oil pump drive sprocket!!!
We couldn't afford genuine gaskets so we cut out some gaskets from a cereal box and they worked fine for the rest of the time I had the bike with no leaks and we even took the bike around Australia for 4 months with us when I was a kid :)
That bike has been through multiple generations of kids and adults and is still probably running to this day :)
Such amazing reliable engines and if you've ever had one or worked on one I'm sure you'd agree :)
P.S. Under that cover was the points plate and behind that a mechanical ignition advance cam runs on the camshaft with weights that throw out as the engine increases revs and it changes the cam position which in turn changes when the points open and close advancing the ignition timing.
Amazing intro!;)
....I hate regular screws on engines. Had an engine once, and I wanted to take the clutch cover off... all screws were destroyed (before I got it). I need a hammer impact screwdriver thingy.. I want hex stuff on an engine. Everywhere.
Mines a 1983 C90G, one of the very 1st 12v models and the very last exported ones made in Japan.
Just thought I'd throw out a bit of what i know about these engines for anyone whos interested.
-The C90E designation is just an iteration and doesn't mean economy. Also the letters aren't done in any particular order.
-All the engines originally have one copper washer in the bottom left cylinder stud while the rest are steel (not sure why).
-Some engines had the points on the side of the cylinder head but as far as I know a lot more of them had them in the left hand stator area.
-Later model camshafts for the 12v ones used ballbearings instead of plain bearings.
"-All the engines originally have one copper washer in the bottom left cylinder stud while the rest are steel (not sure why)."
- this will be the head oil feed one, don't know why I didn't put 2 and 2 together.
"-Some engines had the points on the side of the cylinder head but as far as I know a lot more of them had them in the left hand stator area."
- After reading up a little, this model has a cdi (missing) so the points weren't needed. Wait till you see the stator LOL
workshop matt just about master of the zoom
Electronic ignition sits on the end of the cam shaft. Little pin holds it in place nut and washer holds it in place. It used to be points
Thank fuck for TH-cam I have just bought a c90 so your videos will be great for me to watch, cheers pal.
Brilliant! I almost felt like I was doing it myself! All the cussing and swearing went very well with the beer I was having while watching this!
I'm currently restoring one, Thanks for the information.
bulletproof design, and the C50 was the first bike I popped a wheelie on ! (and the first bike i was pulled over on..."Barry Sheene are we....In a hurry are we sir....")
finally . back to some real work
What do you mean finally - fuck you!
I was been tongue in cheek lol proper engine no mamby pamby electronics crap. and basically just about every other 4 stroke bike engine from the 70 onwards is based on it just more cylinders more gears and a proper clutch oh and then extra cam shafts. as a footnote i used to have a 65 honda 50cc that had pushrods not an overhead cam.
"I was been tongue in cheek lol" - you ain't tonguing my cheek LOL
aw i was going to practice with you so dell boy can make it up to you lol. im pissing my self with laughing watching you grapple with that wonderful piece of engineering. i got that good with em i could take one apart and re-aasmble to working in 20 mins
Hi Josh lots of folks have done what you propose and some made it commercially. Big hint instead of of lethal lithium battery packs try banks of capacitors as well they store far more energy or maybe even a combo. you haver to remember there are mega vested intrest in pushing battery power.
The most fun you can have on 2 wheels period
4:07 and 15:22 That stud does feed oil to the top end. It originally had the domed nut at the top along with the copper washer to seal the oil. The missing part in the section you removed before getting to the cam chain is the automatic timing advance mechanism.
I thought this was going to go on a little longer when it just ends.
You bloody tease!
If you guys don't mind longer then I can do longer
The Workshop Longer video is fine by me. Others though...?
The Workshop longer is good when there's stuff happening, the theoretical stuff could do with shortening or done in parts. I think that would suit viewers and your watch time better.
longer isn´t a good idea i think
many people wont watch.i dont want to either but i will because i like your vids ^^
that copper washer in the front is standart matt ;)
I thought everyone into motorcycles have or had one. I had many. My 1969 trail 90 blew the plug out of the head on a long trail ride and i hammered a block of wood in between the head and plug. It survived for a year that way until (I as a poor 11-12 year old who had to pay my own way) could rebuild the engine. I bet it would of lasted longer hahaha.
The engine that made Honda
When rebuilding make sure you get the right piston. Honda have many different shaped domes/heads for those c90 engines. I have been caught out before with a ct90 when running the piston was slightly hitting the head.
Outch
Back in 1995 my best mate brought a crunch 90 off another mate for 10 Lambert and butler and a teenth!! ....oh to be 15 again with contraband as currency!
Yeah boy awesome video mate, those Honda 90 and 110cc engines are great. Can't wait for part two. Id love to see you tear down and rebuild a Yamaha YZF/WRF 400/426/450 engine, I love that Yamaha five valve engine.
Please do a video on the clutch. It's quite an interesting and clever design.
Those engines were almost bullet proof, one of the first bikes I road was an early 70's CL70. we had a shop full of the mid to late 60's and early 70's of those style of engines ranging from 60cc up to 70cc. Bunch of kids I knew had the old trail 70cc and 90cc bikes.
thanks Matt! great video, a fun project, looking forward to the next installments!
this take's me back first bike engine i had apart. first ever mod was fit a RD 50 M K&N to it LOL
What could it mean if i can’t feel any air displacement from the spark plug hole whilst kicking it? I’m thinking about getting this cub working but Not sure how much work it is
That it's leaking air somewhere. You should have some compression
My c90 has sat idle in my garage since 1989
well look after it they are bringing silly money these days
Why would you do that???
I have a 1969 Honda s90, that's why I'm watching this video, I'm trying to learn how to fix it
Proof that event matt doesn't now everything
In this installment, matt tries to wrestle an inanimate object... and loses
Bit like trying to educate Dell Bollocks then
Now thats a true Yorkshire man LOL
My very first bike as an 8yr old learnt loads from striping down a c90 engine. Not the cub mine was a 1973.
As subtle with tools as the Yorkshire ripper.
Pete is my fucking hero - hammer and driver!
No fuckin about.. Bish bash bosh.
i love this little lump i have a honda msx125 it can trace its roots back to this i believe? looking forward to the next part mat
You could get a pitbike roller cheap to bolt the motor in to. I use to have a road legal 120 pitbike did about 50mph flat out good fun on the back roads
Those marks on the camshaft may have been from someone trying to hold it with a pipe wrench while trying to crack the timing chain gear bolts loose. Pro tip, use the impact gun for those bolts. They'll back right out without trying to rotate the cam gear.
A few mates had them, C70s and 50s too. I had an H100S.
That copper washer on the head bolt is there for a reason. Not a mistake by a previous owner. If you know, you know 😉
thanks for the informative video and colorful commentary !
finally a proper motor
That looks like a pretty big combustion chamber for 90cc. Now I'm quite curious what the static comp-ratio is on these, maybe one of the key reliability features is that hemi along with a rather low compression ratio.
Good question - all will be answered soon
Good practice to place a cloth under the engine so screws dont bounce on the floor. Stuck gaskets: use a razor blade to cut the paper at least 1/2 way round then tap a thin screwdriver in to separate the cap. Use magnetic trays to keep track of parts.
" then tap a thin screwdriver in to separate the cap." - erm no.
@@dirtygarageguy because it gouges the aluminum? That only happens if your fingers are numb and you cant see fer shit. Ya got to have fine motor skills of a surgeon sometimes. i have tapped in the blade of a pen knife edge long and it worked fine.
Very true and I get ya. But you have to look at this from my point of view. The moment I do that then kids/newbies to this say 'well matt stuck a screwdriver in' and fuck their cases. So I have to 1) not do that 2) don't pass that on 3) disagree with the any mention of it LOL if you get what I mean.
Tough? We wired one wide open in neutral and left it, it stopped after 45 minutes but only because the wiring to the ignition melted, we stripped it down and mechanically it was still golden.
Fuckin' love the cub. First "real" motorbike I ever had, passed my test on it.
Remember going to the MCN bash in Peterborough back in the 80s, they had a competition to win - umm - fucked if I can remember, some sportbike or other, but the competition involved a cub with all the oil drained out of it, you got 10 minutes thrashing the thing round a field and the one who melted it won the prize. It lasted 2 days of fat cunts running it flat out with no oil.
Mine broke down on the A4 once, I got towed 40 miles by a madman on a Z900. Rope on the bars, hang on for dear life. Fastest the damn thing ever went, but not an experience I want to relive.
Properly running when run off a dock, reminds me of early days. someone tried hard at it with not a clue in the world.
quick question about boxer engines or engines laying over like this. does one side (bottom side closest to the ground) of the piston/rings wear out a bit faster?
I need to get one of these old footballs to monkey around with. Looks like so much fun.
I'm liking this
Honda has built over 100 Million CK-90 or Cub motorbikes There is a Man from the UK has TH-cam channel CK-90 Adventure has ridden CK-90's all over the World rebuilds them on the side of the road.
I took a 1972 Honda SL 125 motor .. bored & stroked to 160 CC's Powroll ported the head reground cam shaft .. I used the 24 MM Mikuni off from my GYT Kit Yamaha 80 then I put that motor into a 1977 Honda CR 125 frame .. about two years after I build my 4 stoke Dirt Bike Honda came out with the XR-200 4 valve head shorter stroke bigger bore more high rpm motor ..
My points ignition has no spark .. I am looking for a CDI for it .. I had to run a battery as it is now ..
Nice stuff. Loving the greasy bits. Seeing those marks on your cam makes me a bit sad. When I did the rebuild on an m20b20 engine some dickhead also previously worked on the rocker shafts with a wrench. Those shafts and rockers were an absolute pain to remove because of the scoring.
I think some of the earliest c90 engines had a pushrods instead of OHC.
Arguably the engine that destroyed the British bike industry.
Very true. That and BSA and alike being fucking lazy and underestimating the Japanese.
Maybe but it was also management arrogance and so far up there own arses that caused the down fall.
Couldn't agree with you more i was lucky and grew up through all the great changes good and bad i even defected to racing rice burners i was much more competitive even won a formula 5 championship with a very very highly modified RD400 used to make tz 350 look like they where going backwards. Thing is matt now the old British bikes and marque are much in vogue these days so maybe the lazy old twats are having the last laugh
More to do with outdated tooling and selective fit construction, rather than the Japanese quality control. Arrogance did play a part yes. The sohc 750 was the nail in the coffin.
No doubt syncmaster2015. The same speed for less money and no oil leaks. List everything from the BSA Bantam to the big boys, EVERYTHING, Honda did began with this engine! Check out the Velocette LE styling, but vastly improved and lightened.
The points and back plate is missing out of that cover on the head Matt
Gary fulle
And the mechanical advance mechanism
what bit was on the impact? Got some simmulair fucked screws on the sprocket cover of the GS500 i recently bought, wanna try to get them out decently before going to drilling them out.
Cause that bit seems to work magic!
Also looking forward to the other parts!
JIS bits - I'll have to check what make they are. I have a few LOL
Vessel make some lovely JIS bits.
hemi? PERK!!!
LOL, I pulled one of these apart for a coworker in the late 70's, who bought it from a guy who assured him it ran, when he dropped it off and told him the thing was seized he asked me to do what i can, well when I pulled the cylinder off, the piston came off with it, the rod had snapped at the wrist pin when the piston was at tdc and totally wrecked the case, looked as if it had never seen a drop of oil (oiling hole was never drilled in the piston rod) I think we paid like $25? for a replacement used engine/w wrecked bike included ;-) from a local junker, that thing got him to work for years! almost 30 miles a day
nice to see a tare down hope you complete it please
What happened to the shit Chinese engine teardown with Isaac
He's gotta finish it off.
The Workshop so in other words its never gonna happen
Yeah its gonna happen - we've been pissing around with his moped recently and these recent videos were recorded when I was on holiday and Isaac was a college
Just wait for it to tear itself up.
Compare the Chinese one the the genuine one i would like to see what the actually quality difference is! Be great
As a nipper i was told that the corroded alloy comes apart easier if you have a hot steaming piss over it.
left a shitty comment last week matt i apologies great video this one 👍
LOL no need to apologize - I'm not a fanny LOL
I had a mustard/beige 90 and a blue 70, i used to go for miles on my 70, my first road bike was a Honda ss50 when i was 16, have you seen the street cub builds?
the what cub builds?
The Workshop Google street cub uk
Jesus help these people
The Workshop they are very popular though, I'd have one and yes i need help.
Send Issac he will be able to sort em out LOL
The points, or CDI trigger in the case of the Xl185 I had which had a similar head) shoud've been under that cover, someone's removed it & not put it back.
How many engines can run in this state ?
Made In Japan
My 1971 C90 is smoking like an absolute bastard when it revs, fancy having a look at it for us?
In what way?
@@dirtygarageguy It went into my local bike shop for a new clutch, then on the way home it kinda siezed as it got warm then released, i took it back then a day later they gave me it back and it did it again. Back and forth again then it started to smoke lots at higher engine speed.
I've since took it to a different shop and it's having a rebore etc...
You seem to know exactly what you're doing and wondered if you fancied having a look at it, but sorted now, thank you.
All the best...
Something was there is an 'ignition' timing device.
Did you know that Jawa took Honda to court in 1966 because Honda had exactly copied and produced the automatic clutch / gear (Blatant patent infringement)??
In 1966 the world's biggest motorcycle manufacturer with Honda then second so it was the big boys going head to head in court.
The case created a legal precedent and is referred to as "The Case of the Clutch - Jawa versus Honda" in law books.
In the end Honda apologised and settled out of court agreeing to pay royalties to Jawa for every motor Honda sold with the Jawa system installed.
Since then Honda and Jawa have become friendly and their engineers have collaborated on various research projects.
One example is the Honda DN01 automatic cruiser motorcycle that saw the Czech engineers who created the Babetta 50cc 2 speed fully automatic self shifting gearbox working for Honda R&D. (Something for the Workshop to explain, though the Del Boy version would have more comedy value.....)
I've rebuilt Honda Cub motors in the past and they're quite mechanic friendly.
With a friend, we designed a sliding camshaft tapered cam lobed variable valve timing prototype on a Honda C90 engine back in 2004, approached General Motors and were told in a letter that, "GM can see no requirement or future in variable valve timing 4 cycle engines". When Suzuki announced a very close but inferior system 2 years later we gave up. Ours was better though as it used a cyclic rack instead of a second shaft and guide forks.
"Did you know that Jawa took Honda to court in 1966 because Honda had exactly copied and produced the automatic clutch / gear (Blatant patent infringement)??"
- No I didn't very interesting
I remember the press stuff every one laughed and scorned Jawa at the time .Thinking that some eastern block country couldn't possibly be that clever and be much smarter than the Japanese. David and Goliath allways springs to mind
Eastern European bikes had some great engineering a long time ago, some innovative design and great racing pedigree.
If they'd had the materials and finance they could have been decades ahead.
Tip: When you make videos,you don't curse ans swear.
fuck off...
I love. The. Honda motor own a early 60s S90. I beleive the engine is listed in World records as the Worlds most produced small engine of all time mine is actually on the original motorcycle. That has been stored indoors since the sixties as my Dad bought the bike but did not ride it as he intended to ?
JIS screws are always destroyed as 99% used Philips or even pozi drivers back in the day and they always cammed out rather than turn the screw.
Quick question, is my Honda C70 engine supposed to turn freely backwards when I turn the magneto counterclockwise?
Two questions.
1. What's a torque gun? It sounds different to an impact driver / wrench.
2. What kind of bit did you use in it? Or was it just an Easy Out type thing?
"1. What's a torque gun? It sounds different to an impact driver / wrench."
- LOL same thing.
"2. What kind of bit did you use in it? Or was it just an Easy Out type thing?"
- JIS number 2
Furry muff.
I’m hooked 👍
More of these kind of videos (where you tear shit open) m8 they're interesting as fuck!
I have a 1964 50 cc motor you can have mate how do I get in touch to send it to you?
Good one.
Classy 😎
One of these tried to kill me back in the 70's.the engine maybe brilliant but the bikes they put them in weren't,the Honda trail 90 I was riding(not my bike)has no real suspension in front despite the word trail on the bike.i tried to jump over a small ditch at say 40mph.worst beating i ever took.the bike was fine though LOL.
mbsnyderc
The bike and engine didn't try to kill you, it was YOU trying to kill you. Those bikes were engineered to be dumbass friendly.
Mine stopped running im gonna have to send it to a shop to get it running I'm sad tho I love riding my 68
I tell ya what mate if you use a bigger ratchet it might be a bit easier to undo them 10mm bolts lol
doesn't matter what you use they usually strip the threads any way stripped many many of em down over the years
1/4" drive tools are fine on stuff like this.
Someone's nicked your ignition. There should be points, points cam etc under that left hand cover on the head.
Get a socket adapter for your rattle gun. It would have made short work of those timing sprocket bolts.
At one point I had about half a dozen 50s and 70s. Over time the auto clutches wear and start sticking. One I had was pretty bad so I ended up converting it to a normal hand clutch with mostly just basic workshop tools, apart from the release fork I made up which I had to weld. It worked rather well. The only issue was a bit of an oil leak as I didn't have a proper oil seal where the release pivot came out through the clutch cover.
"Someone's nicked your ignition. There should be points, points cam etc under that left hand cover on the head."
- The C90e had a CDI, hence why the points are missing.
"Get a socket adapter for your rattle gun. It would have made short work of those timing sprocket bolts."
- I have, that's what's on the end of the gun.
"The C90e had a CDI, hence why the points are missing." I'm pretty sure the CDI C90s have a different cam sprocket cover, without the points stuff. There's no point having a double cover with an oil seal if you don't need it. They also have more wires coming out from the alternator. Points ran from the battery, CDI had extra windings on the alternator. Yes, I am sad enough to remember this shit. If yours truly was CDI it must have been some odd transition model.
"There's no point having a double cover with an oil seal if you don't need it."
- I believer this was the first year of switch over to CDI and generally what Honda did was to make the same engine (use the same tooling for the injection moulding) just mitigate the points. After all was good they then redesigned and re-tooled for the upgraded engine - but this isn't gospel.
OK, I did a bit of research and as I thought yours is a 6V points model. Only the later 12V had CDI. That engine was quite a bit different. The engine number does not correspond to the model number so just to be confusing C90E engine numbers were before the C90E model. You only have 3 wires coming from the alternator - gnd, battery charge and headlight (6V were direct lighting). If there is no timing trigger from the alternator it must come from points. Oh, by the way another hint is the bolt in the end of the camshaft - it's to hold the advance mechanism in place.
old used philips screws suck so much
jompa zx they are actually JIS (Japanese industry standard) screws. Most people use 'Philips' type drivers on them, that don't fit properly and bugger them up!
Clutch isn't centrifugal, it's operated by the gear shift, as the gear shift linkage moves, it engages/disengages the clutch
Copper washer is on one head bolt, as it's to seal the oil gallery from the oil pump to the head
That's a 6v engine so it's has points on the head. Later 12v engines have CDI ignition with a trigger coil on the flywheel.
Are you using a JIS screwdriver bit?
Honda use JIS not Philips, Philips/Posidrive cam out in JIS fasteners.
That's not the cam chain tensioner, it's the guide sprocket, the tensioner is next to the oil drain on engines with the hydraulic tensioner.
Fin rot on the bottom of the cylinder is normal, doesn't mean water has got in the engine, it's caused be road muck spraying on the bottom of the cylinder.
Sir may ask something, how to convert 90cc platino to cdi? Thanks
That's coming soon
great!
Fuck all those screws, they look like they could turn things into a fucking nightmare real quick..
I was making food for a vegetarian friend of mine yesterday and when cooking instead of thinking "wait, vegetarian or vegan?" while reaching for butter, my brain went "is butter meat?"
Those "Phillips" screws aren't actually "Phillips" rather JIS screws. JIS is the Japanese version of screws and drivers. Over years of people mistakenly using Phillip's head tools on them...they strip.
Lol you didnt get the joke...
It's probably been said but I can't be arsed to read it all. That's not a c90e engine, it's a c90zz. The e. Is electronic ignition and at 87cc not the 89.5 of the 90z. The z engine was really only used on the ct90 and the c90z. The points cover on the end of the cam is the give away! Got one in the garage I'm working on atm.
Apart from the fact that its has 'C90E' stamped on the engine......
It's an "E" code engine but it's not out of a c90E. It's out of a C90Z. I just checked mine to be sure and it's an "E" code engine. It doesn't stand for economy or anything. It's just the code letter.
I'm not arguing - I just read this -
The C90-E models, also known as the 'Super Cub' or 'Economy' models, are largely the same as the -C models but feature heavily revised cycle parts with more angular styling and are fitted with larger, rectangular flashing indicator lamps and head lamps; a fuel gauge is fitted and the handlebar controls improved.
4-stroke.net/library/identification/how-to-identify-a-honda-c90
I'll have to check the serial number....
yup thats the later model. i have a "z" made in '81 i'm restoring atm. they were the last of the round headlight/points ignition models using te engine out of the ct90 trail. the engine itself isn't the same dimensions as a pit bike motor either as they are based on the models with the ignition behind the flywheel. :)
I have a c90 with an inspection sticker from 1968. It ran and would drive but after about 2-3 minutes it would get hot as hell and start knockin like hell. I have taken it to a few people and they dont know whats up with it. I am planning to tear it down and rebuild it. Im using your video as reference. Would be happen to share pics with you to compare as you mentioned in this video
Put some thicker synthetic oil in it to cushion all the worn out bearings a little bit better. Is the head and cylinder painted? If it is that's part of your problem depending how thick the coats are.
I like C90's clutch with steel balls 😂
That's a c90zz engine or earlier. The later cub90 engine is a bored and stroked c50 engine. The zz engine is a proper 90. My mate races a zz and we race a cub. You can make an Indian royal enfield electronic ignition work on them. They convert to 12 volt dead easy. The very early 90 engines have a slightly different gearbox and a note on the side of the engine for different oils to use for different temperatures.
The serial number is C90E - 51 bla bla bla - are you sure its a ZZ?
Yeah deffo a c90 zz. Could be anything up to around 1983'ish.
I didn't know the difference when we started. Having ridden loads of them over the years. The round headlamp one's are usually z engines one's like the one you have. The square headlight one's like ours have the 50 based engine which is lighter and slightly faster but not as well built. The Chinese 110 engines are based on the cub engines, so almost all of the tuning parts you can buy are for that style engine. Which is why most people run them. Do you want me to see if we have the missing points and advance bits you are missing from that engine?
in the presence of greatness lol! i grew up on these old honda engines i love them. ya your missing the points set up that runs off the cam. newer ones turned to cdi with a timing adjuster on the cam its a pretty cool set up
unless the motorcycle is different and the points are on the flywheel. ive only had the 3/4 wheeler 70-350cc honda engines
Can we see the primary chain & synchros pleases ? :P
LMAO!
this isn't a harley engine you know
+John Foster I know, it's a two stroke
yeah!!! i need to repair one is detroyed and abondoned sooo thanks and dont dare left the serie video whithout finish! sorry mi englhis still a really crap state.
How to differentiate between 12v and 6v system on this hondas