My friend used a ar80 gears in his 50 and then put the kit on top it was a real beast for a little 50 this was back in 1988 the extra gear made all the difference well impressed that these little bikes are still about
OMG I had an AR 50 with a 93cc big bore kit in the early 90's. Strange thing is it did not go as well as my AR 80 with just an All Speed exhaust upgrade. That revved to 14k rpm on the clock. Man I wish I still had them☹️
Cool - I loved my first AR 50 too. I got it in 1993 when I was 16 to replace a Honda MT5. The AR was so good and when the 93 kit was put on it'd go about 65-70mph depending on wind and slope as I remember... Interesting about you saying the std 80 went better -maybe I need to have a look at trying a 80 barrel? If you fancy another there are still plenty about if you keep an eye out on eBay or the AROG owners group on Facebook.
14k rpm??? My 89 AR50 would only rev to 7k but only when going downhill, it would pull about 6500 rpm on the flat. I later learned that the 50 had a 6th gear but it was blocked off via the shift drum, don't know if that was true or not, the video suggests not. I guess I'm lucky mine was so restricted and slow, it got me to and from work, 35 miles a day for 2 years without breaking down, I didn't even have to put a piston in it! I actually can't remember what happened to it, I checked the DVLA website recently - its still registered in my name!
Sounds like a good work horse you had there! I wonder where it is? I did the 6 speed conversion on mine. It was fairly easy once I'd got hold of the parts (one gear was from the USA). I've found that the standard ignition is very restrictive on rpm but the standard port heights do the too.
@@Subjectno23 The clocks indicated around 14k I doubt it was anything close to that but the powerband was awesome. And yes they were very reliable and well engineered. I saw one a few years ago and couldn't believe how tiny they are compared to my memory.
Wow that's a massive blast from my childhood(16yrs in '94 👍, i wish I could send you a picture of my ar50 it was an almost standard looking cylinder bore.. maybe skimbed once or twice.. had a coke can ar80 micron exhaust (really small). Plus some racing reed valves can't remember the make, it was also ported (none professionally but wow) with a K&N air filter/ jetted accordingly over tests, and multiple gears bought/ sprockets to get to where it would do 60mph at 8500rpm up hill and able to climb rpm, and around 65-70mph at 9000rpm on flat roads. No light fairing either, all my friends back then had Suzuki ts50's with urtizer 90cc bigbore kits( spelt wrong) and were fast but the ar50 of mine was better all round low torque/top speed and all through the range where the Suzuki was at high rpm only or at least for those particular bikes and setups. I also owed a ar80 at the same time and used to just change all the plastics and petrol tank over so the 80 appeared to be my 50🤣 the 80cc did around 60mph and struggled at hills until I put the ar80 micron exhaust on for my 50cc and changed some Jett's and sprocket's then 85mph, but was sold soon after. My ar50 got stolen in late 94 which broke my heart and young world ☹️ I can laugh now finally 🤣😭😭
Hi Wayne - pleased it's bringing back some happy memories 🙂 Sounds like a flier you had and a shame it got nicked! I think mine did about 65 mph as a 93 and did about 50 mph on a good day as a 50cc. It had the big can Micron exhaust and I will say I like the look of the small can one... Saw one for sale the other day for £500!
I had an AR50 back in 1992, it was gutless but I loved that little bike, always thought they looked good as far as mopeds go. Also had the AR 80 but never got that on the road.
I had one of these in 1996 (white J plate) found out my dads friend raced one and I took mine to him. He ported the exhaust port, ported the intake manifold, did something with the slider in the carb, and gave me an old Micron he had laying about. Already had a 80 rear sprocket……did 55mph after a couple hours tinkering. Happy days.
Very enjoyable watching these,my ar 50 was a 1984 bike I’m near sure and at 16 I bought the 93 cc kit,when I stripped the bike and fitted the big bore the piston hit the head, I took the head to a school friends dad’s business and he welded the head up and I spent nights sanding it into the shape I thought the combustion chamber should looked 🙈kept testing it with soldering wire until it turned over free,no measuring tools were used i fitted a ap 100 carb I’m near sure and a micron and the bike flew never missed a beat for two years to I bought a car
Hi Brian - I'm pleased you are enjoying the vids. Sound's like you had a great bike there. What sort o speed did it go? It must have taken a while to sand the combustion chamber!
@@AutoBeta2T the combustion chamber was left rough from memory most of the grinding was done with a grinding stone in a drill then the head was skimmed on a big belt sander for car cylinder heads,my mate had a ford fiesta and he clocked me at 83mph down hill,the car couldn’t pass the bike
That was one of my AR50's I lent them. I've still got the engine and pipe etc. I'll be putting it back in a bike shortly with a new digital ignition to see what we can get out of it. They would of reached 100mph but they didn't change the sprockets I left on it. They ordered different sprockets, but then the rider went off to university and the airfield was booked up, so it came to a premature end. 🙄 You will need longer barrel studs too, the 50 ones are too short for the autisa. 👍🏻
Cool - maybe you will get to 100 mph before me 🙂. Gearing is certainly one of the keys to getting there as the powerband is quite tight. I'll be interested to run the data through a program I use to assess power and gearing etc. Yes it was a shame it never quite got done but it was still a great series of articles and hopefully it may still be attained. Good shout on the studs. Are AR 80 studs required or is it something specific to the Autisa kits?
@@AutoBeta2T Me and my mates have highly tuned road going AR's they are rapid but reliable. We run 24mm carbs, as did the practical sportsbike one. Don't think 21mm will be big enough. We run digital programmable ignitions and hand build exhausts made by a friend Firepower Engineering. I supply a lot of AR parts as well as restore them. I have the longer studs on eBay, they are no longer available from Kawasaki. It made me smile when I watched your video, as my business name is on the side of the bike in the magazine and I seen you open the page where me and my Dad were lifting the bike up. 😊👍🏻 I will have magazine you are missing somewhere. I run an AR50/80 group on Facebook called AROG for short, I started putting the sportsbike articles on there for people to follow. 👍🏻 You will need plenty of horses and a long straight to top 100mph. 👍🏻
@@holmetech1199 cool - I was thinking 21mm may struggle. I know 50cc race bikes can get about 20 ish hp with one and the BDK figures as I remember indicate about 18 hp. I think a good 25 hp is required which hopefully I can get to. There's certainly scope for more blowdown STA on the BDK tune and I have a couple of other ideas to try. Should be fun 🙂
I had a few of these, delorto carb 80 gear box, single piece exhaust, de-restricted cdi unit, big jet in the carb.. then just get the sprockets right.. from memory slightly bigger at the front and smaller at the back.. mine did 96/97 and I was 16 at the time🤣🤣🤣 I think I also kept 2 spare engines ready to go in.. hahahahah👍 good work though mate I’d love to find 1 to do up myself tbh…
Sounds like a flyer you had there DRize! They are fun little bikes and it takes me back to when I was 16 ☺️ There still is some about that are for sale... Prices are pretty healthy, mind, well they were last time I had a look.
I had a standard ar50 in 1996 as my first road bike. It was so slow standard, 35mph top as I didn't have the finances to tune it. 26 years on and I'm tuning my 77cc Aprilia rs50 to reach 80mph, 74mph on gps is my highest top speed but I have a lot more planned for it.
@@AutoBeta2T just an airsal 77 that I've changed the porting a little, matched the transfers with the engine case, thicker base gasket and head machined for a 6mm squish, Doppler crank, single ring piston, delorto 21 with 90 main, carbon reeds reeds, uprated clutch, yasuni r3 exhaust, top performance ign coil and a load of other stuff I've forgotten. I was planning on using it on short tracks but life keeps getting in the way. Would love an ar50 as a tuning project
Sounds like a nice setup. Used to love my little AM6 but we couldn't go above 50cc. We used to run a KRD barrel but I always wanted a Mallossie Team barrel. I know what you mean about life getting in the way. It's busy busy! Hope you get an AR. There's still some.that come up for sale at not stupid prices.
I had the ar50 it was my first 50 and my last, fun bike but so small when your over 6ft2 you look like you on a kids bike , still enjoyed for almost a year , I then got the ar 125 what a difference , still a small bike but handled really well
The AR50 restricted UK model had a 14mm carb... Also the ignition timing was fixed to 14degeees advance but the unrestricted one and the 80 were 20 degrees ... So you may need to modify the stator plate it use the AR80 one if you can get it. You may have already sussed this all out of course.. Also I would be tempted to nicasil plate the bore.
Hi Trevor - thanks for the comment. I've put on a Ignitec ignition since this video (there's a vid for it on the channel) which made a big difference and also a 28mm carb and bigger reeds. I'm just in the process of building the first pipe :) Hope you enjoy the rest of the videos. I like the idea of nicasil. Probably a job for when I have all of the porting finished. I have toyed with the idea of an ally sleeve for the barrel which would be plated. Cheers 😊
you need the minarelli am6 2 stroke watercooled block . you then get a 2fast 100 cc head barrel and cylinder kit plus a big 2fast beefed up crank a 34- 36mm carb cdi ignition carbon reed valve and you got a genuine 100mph 2 stroke scream dream. its also a good idea to beef up the box and go close ratio.
Hi - thanks for the input. I used to race a Aprilia RS 50 with the am6 engine. Doppler barrel and KRD pipe plus PVL ignition as a 50 in think it had 14-15 hp. It's a great engine with lots of options as you describe to go faster. Unfortunately the original magazine article kept to the original Kawasaki engine with the 93cc barrel so I need to do the same 😊
@@AutoBeta2T OK. Won't cooling be an issue though? It is possible to rig up a water-cooled barrel and head either on the yam bits or. Mod a minatelli barrel to fit. Maybe. It's gotta be worth a try I reckon.
@@yogiguitar1 Hi, Yes I recon cooling will be an issue particularly as I'll be at wide open throttle for some time trying to get to 100 mph. My plan is to try and use the fueling to keep it cool as best I can but time will tell if it can be done. Methanol is an option to help run cooler but i'm trying to do it on pump petrol. I have seen cylinder head water cooling on older air cooled yam RD so it is an option I could consider if I can't control the heat. I wonder how many detonated piston remains I'll have on my shelf of offerings to the God Of Speed?
@@AutoBeta2T well if you can make it happen man its gonna be a great thing. tell you wot though if you can rig up watercooling on the orig head then thats gonna give hope to alot of old 2stroke sports bike owners. especially kwacker triples. they'd love water cooled heads
Hi, it's going. Pipe is done and next is back to the Dyno. Lots of other stuff to try so hopefully an interesting autumn and winter in the garage getting ready for the spring and hopefully some real world tests. About the same time as me. I think I got mine in 93 but could have been 94...? 30 years ago. What speed did they get you at?
I had a Kawasaki AR 80 Standard everything else except , I got it tuned head skimmed and ported 2 mm , it would do 78 mph !!!!! would of gone much faster if I had changed the gearing !!!!
My friend used a ar80 gears in his 50 and then put the kit on top it was a real beast for a little 50 this was back in 1988 the extra gear made all the difference well impressed that these little bikes are still about
Yep - that extra gear from the 80 helps. Glad I did the mod.
OMG I had an AR 50 with a 93cc big bore kit in the early 90's. Strange thing is it did not go as well as my AR 80 with just an All Speed exhaust upgrade. That revved to 14k rpm on the clock. Man I wish I still had them☹️
Cool - I loved my first AR 50 too. I got it in 1993 when I was 16 to replace a Honda MT5. The AR was so good and when the 93 kit was put on it'd go about 65-70mph depending on wind and slope as I remember... Interesting about you saying the std 80 went better -maybe I need to have a look at trying a 80 barrel? If you fancy another there are still plenty about if you keep an eye out on eBay or the AROG owners group on Facebook.
14k rpm??? My 89 AR50 would only rev to 7k but only when going downhill, it would pull about 6500 rpm on the flat.
I later learned that the 50 had a 6th gear but it was blocked off via the shift drum, don't know if that was true or not, the video suggests not.
I guess I'm lucky mine was so restricted and slow, it got me to and from work, 35 miles a day for 2 years without breaking down, I didn't even have to put a piston in it!
I actually can't remember what happened to it, I checked the DVLA website recently - its still registered in my name!
Sounds like a good work horse you had there! I wonder where it is?
I did the 6 speed conversion on mine. It was fairly easy once I'd got hold of the parts (one gear was from the USA).
I've found that the standard ignition is very restrictive on rpm but the standard port heights do the too.
@@Subjectno23 The clocks indicated around 14k I doubt it was anything close to that but the powerband was awesome. And yes they were very reliable and well engineered. I saw one a few years ago and couldn't believe how tiny they are compared to my memory.
Wow that's a massive blast from my childhood(16yrs in '94 👍, i wish I could send you a picture of my ar50 it was an almost standard looking cylinder bore.. maybe skimbed once or twice.. had a coke can ar80 micron exhaust (really small). Plus some racing reed valves can't remember the make, it was also ported (none professionally but wow) with a K&N air filter/ jetted accordingly over tests, and multiple gears bought/ sprockets to get to where it would do 60mph at 8500rpm up hill and able to climb rpm, and around 65-70mph at 9000rpm on flat roads. No light fairing either, all my friends back then had Suzuki ts50's with urtizer 90cc bigbore kits( spelt wrong) and were fast but the ar50 of mine was better all round low torque/top speed and all through the range where the Suzuki was at high rpm only or at least for those particular bikes and setups.
I also owed a ar80 at the same time and used to just change all the plastics and petrol tank over so the 80 appeared to be my 50🤣 the 80cc did around 60mph and struggled at hills until I put the ar80 micron exhaust on for my 50cc and changed some Jett's and sprocket's then 85mph, but was sold soon after.
My ar50 got stolen in late 94 which broke my heart and young world ☹️ I can laugh now finally 🤣😭😭
Hi Wayne - pleased it's bringing back some happy memories 🙂
Sounds like a flier you had and a shame it got nicked!
I think mine did about 65 mph as a 93 and did about 50 mph on a good day as a 50cc. It had the big can Micron exhaust and I will say I like the look of the small can one... Saw one for sale the other day for £500!
I had an AR50 back in 1992, it was gutless but I loved that little bike, always thought they looked good as far as mopeds go. Also had the AR 80 but never got that on the road.
Yep, standard they were a little slow! I just loved the freedom and independence it gave me. 😀
I had one of these in 1996 (white J plate) found out my dads friend raced one and I took mine to him. He ported the exhaust port, ported the intake manifold, did something with the slider in the carb, and gave me an old Micron he had laying about. Already had a 80 rear sprocket……did 55mph after a couple hours tinkering. Happy days.
That's a good top speed! Great little bikes - I used to love mine!
Very enjoyable watching these,my ar 50 was a 1984 bike I’m near sure and at 16 I bought the 93 cc kit,when I stripped the bike and fitted the big bore the piston hit the head, I took the head to a school friends dad’s business and he welded the head up and I spent nights sanding it into the shape I thought the combustion chamber should looked 🙈kept testing it with soldering wire until it turned over free,no measuring tools were used i fitted a ap 100 carb I’m near sure and a micron and the bike flew never missed a beat for two years to I bought a car
Hi Brian - I'm pleased you are enjoying the vids. Sound's like you had a great bike there. What sort o speed did it go? It must have taken a while to sand the combustion chamber!
@@AutoBeta2T the combustion chamber was left rough from memory most of the grinding was done with a grinding stone in a drill then the head was skimmed on a big belt sander for car cylinder heads,my mate had a ford fiesta and he clocked me at 83mph down hill,the car couldn’t pass the bike
@@brianwaring4756 now that's a cool story and 83mph is very fast.
Mine did 70 if I was lucky!
Great times 😁
I had one of these in 1989 Ar 80 top and sprockets fitted and a gianeli exhaust loved it
Great bikes 😁
That was one of my AR50's I lent them. I've still got the engine and pipe etc. I'll be putting it back in a bike shortly with a new digital ignition to see what we can get out of it. They would of reached 100mph but they didn't change the sprockets I left on it. They ordered different sprockets, but then the rider went off to university and the airfield was booked up, so it came to a premature end. 🙄
You will need longer barrel studs too, the 50 ones are too short for the autisa. 👍🏻
Cool - maybe you will get to 100 mph before me 🙂. Gearing is certainly one of the keys to getting there as the powerband is quite tight. I'll be interested to run the data through a program I use to assess power and gearing etc.
Yes it was a shame it never quite got done but it was still a great series of articles and hopefully it may still be attained.
Good shout on the studs. Are AR 80 studs required or is it something specific to the Autisa kits?
@@AutoBeta2T Me and my mates have highly tuned road going AR's they are rapid but reliable. We run 24mm carbs, as did the practical sportsbike one. Don't think 21mm will be big enough.
We run digital programmable ignitions and hand build exhausts made by a friend Firepower Engineering. I supply a lot of AR parts as well as restore them. I have the longer studs on eBay, they are no longer available from Kawasaki. It made me smile when I watched your video, as my business name is on the side of the bike in the magazine and I seen you open the page where me and my Dad were lifting the bike up. 😊👍🏻
I will have magazine you are missing somewhere. I run an AR50/80 group on Facebook called AROG for short, I started putting the sportsbike articles on there for people to follow. 👍🏻
You will need plenty of horses and a long straight to top 100mph. 👍🏻
@@holmetech1199 cool - I was thinking 21mm may struggle. I know 50cc race bikes can get about 20 ish hp with one and the BDK figures as I remember indicate about 18 hp. I think a good 25 hp is required which hopefully I can get to. There's certainly scope for more blowdown STA on the BDK tune and I have a couple of other ideas to try. Should be fun 🙂
I had a few of these, delorto carb 80 gear box, single piece exhaust, de-restricted cdi unit, big jet in the carb..
then just get the sprockets right..
from memory slightly bigger at the front and smaller at the back..
mine did 96/97 and I was 16 at the time🤣🤣🤣 I think I also kept 2 spare engines ready to go in..
hahahahah👍 good work though mate I’d love to find 1 to do up myself tbh…
Sounds like a flyer you had there DRize! They are fun little bikes and it takes me back to when I was 16 ☺️
There still is some about that are for sale... Prices are pretty healthy, mind, well they were last time I had a look.
I had a standard ar50 in 1996 as my first road bike. It was so slow standard, 35mph top as I didn't have the finances to tune it.
26 years on and I'm tuning my 77cc Aprilia rs50 to reach 80mph, 74mph on gps is my highest top speed but I have a lot more planned for it.
Sweet - I used to race an rs 50, it was a great bike. What big bore kit. do you have on it?
@@AutoBeta2T just an airsal 77 that I've changed the porting a little, matched the transfers with the engine case, thicker base gasket and head machined for a 6mm squish, Doppler crank, single ring piston, delorto 21 with 90 main, carbon reeds reeds, uprated clutch, yasuni r3 exhaust, top performance ign coil and a load of other stuff I've forgotten.
I was planning on using it on short tracks but life keeps getting in the way.
Would love an ar50 as a tuning project
Sounds like a nice setup. Used to love my little AM6 but we couldn't go above 50cc. We used to run a KRD barrel but I always wanted a Mallossie Team barrel.
I know what you mean about life getting in the way. It's busy busy!
Hope you get an AR. There's still some.that come up for sale at not stupid prices.
Had an AR50 as a kid. I think it had a 14 or 16mm Mikuni carburator standard.
Used to love mine when I was 16.
Yeah, it was a really small carb on the 50!
I had the ar50 it was my first 50 and my last, fun bike but so small when your over 6ft2 you look like you on a kids bike , still enjoyed for almost a year , I then got the ar 125 what a difference , still a small bike but handled really well
Yeah - fun time and freedom as I remember all.those.years ago...! Yep I'm 5' 7" so I fit quite nicely 🙂
Great project Dave👍
Cheers Marcus 😊
I need to get my finger out and get ready for the Dyno!
Friend had the 50 converted to 80 and ran on methanol...was a rocket. Cops chased but neva caught him in the 80's on their 750 Suzuki bikes😂
No methanol is an idea 🤔
The AR50 restricted UK model had a 14mm carb... Also the ignition timing was fixed to 14degeees advance but the unrestricted one and the 80 were 20 degrees ... So you may need to modify the stator plate it use the AR80 one if you can get it.
You may have already sussed this all out of course..
Also I would be tempted to nicasil plate the bore.
Hi Trevor - thanks for the comment.
I've put on a Ignitec ignition since this video (there's a vid for it on the channel) which made a big difference and also a 28mm carb and bigger reeds. I'm just in the process of building the first pipe :)
Hope you enjoy the rest of the videos.
I like the idea of nicasil. Probably a job for when I have all of the porting finished. I have toyed with the idea of an ally sleeve for the barrel which would be plated.
Cheers 😊
THANK YOU
you need the minarelli am6 2 stroke watercooled block . you then get a 2fast 100 cc head barrel and cylinder kit plus a big 2fast beefed up crank a 34- 36mm carb cdi ignition carbon reed valve and you got a genuine 100mph 2 stroke scream dream. its also a good idea to beef up the box and go close ratio.
Hi - thanks for the input. I used to race a Aprilia RS 50 with the am6 engine. Doppler barrel and KRD pipe plus PVL ignition as a 50 in think it had 14-15 hp. It's a great engine with lots of options as you describe to go faster. Unfortunately the original magazine article kept to the original Kawasaki engine with the 93cc barrel so I need to do the same 😊
@@AutoBeta2T OK. Won't cooling be an issue though? It is possible to rig up a water-cooled barrel and head either on the yam bits or. Mod a minatelli barrel to fit. Maybe. It's gotta be worth a try I reckon.
@@yogiguitar1 Hi, Yes I recon cooling will be an issue particularly as I'll be at wide open throttle for some time trying to get to 100 mph. My plan is to try and use the fueling to keep it cool as best I can but time will tell if it can be done. Methanol is an option to help run cooler but i'm trying to do it on pump petrol. I have seen cylinder head water cooling on older air cooled yam RD so it is an option I could consider if I can't control the heat. I wonder how many detonated piston remains I'll have on my shelf of offerings to the God Of Speed?
@@AutoBeta2T well if you can make it happen man its gonna be a great thing. tell you wot though if you can rig up watercooling on the orig head then thats gonna give hope to alot of old 2stroke sports bike owners. especially kwacker triples. they'd love water cooled heads
@@yogiguitar1 thanks for the support - hopefully I can make it happen with a bit of help and good luck. Cheers for the comments and keep watching 🙂
👽👍
Hi, how's this project going?
I had an AR50 in 1992, kept it at 49cc but a few mods meant 55mph and a ticket for speeding when I was 16 😂
Hi, it's going. Pipe is done and next is back to the Dyno. Lots of other stuff to try so hopefully an interesting autumn and winter in the garage getting ready for the spring and hopefully some real world tests.
About the same time as me. I think I got mine in 93 but could have been 94...? 30 years ago.
What speed did they get you at?
....there is alwats billet cases/ internals/ top end. blowers and the grand daddy of obscene HP NITRO METHANE! best of luck n BE SAFE!
Haha, yep... i'm hoping I'll get to 100mph before I have to resort to super expensive stuff! It would be a cool project though.
it is being done,"2 stroke stuffing" is the y t channel to see this beast develop! @@AutoBeta2T
I had a 93cc big bore ar50 when was 16yrs, got 73mph out of it 😂
Hi Simon - ditto! It was a good upgrade from the 50 barrel. Made the run to college a bit quicker!
😂
You’ll want a 28mm carb
Hi, that's where I am at - 28mm. It gave more power than the 21mm delortto 😊
Is there a 90cc for an ar80?
Hi - this 93 cc kit fits the AR80 too.
@@AutoBeta2T Thanks mate
I had a Kawasaki AR 80 Standard everything else except , I got it tuned head skimmed and ported 2 mm , it would do 78 mph !!!!! would of gone much faster if I had changed the gearing !!!!
Sounds like you had a flyer there!
@@AutoBeta2T Got to see if you get the 100 mph I think you will do it ,,, you just need to get 20 bhp , id say 23 bhp
@@AutoBeta2T Just found this video th-cam.com/video/a7ChdMMG1jg/w-d-xo.html
@@AutoBeta2T The engine apparantly are pretty tough
@@markthoughtswithukrainemas2072 cheers and yes - I think 23 may just do it... Fingers crossed 🤞
With a big bore kit and a new gearbox you should be laughing.
I'm hoping so Andy 😁
I just need to get my finger out and back on with it now!
Matt at bdk has the fastest engine in the world
I heard they had one of these to 100mph!