Stripped Spark Plug FIX Motorcycle
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- เผยแพร่เมื่อ 26 พ.ย. 2012
- Quick Fix of a stripped out spark plug hole
TAP you'll need for M12-1.25 plug : amzn.to/2Pq2LJ3
1977 Honda Trail 70 ct70
Went from the stock M10-1.00 to M12-1.25 plug
TAP: amzn.to/2Pq2LJ3
D8HS NGK I ended up taking this one out and am now using a D6HS NGK amzn.to/2LGKFQQ
use a D6HS NGK
You'll need a m12-1.25 tap and a 27/64" drill bit to predrill for the tap. - แนวปฏิบัติและการใช้ชีวิต
Thats a great fix & better than a shop vac. The guy at O'reilly auto told me once they sell alot of those heilo-coil repair kits.
Nice video. Using tape to line up the drill bit was genius.
blipco5 Thanks Man.
Yet another fine fix you've done there!!! Hope I never need to fix one... but if I do... will keep this in mind. Thanks, Dusty
Hi
Dude, I love the creativity of using compressed air. I'm going to try this today on a little Honda 80 dirt bike. Since it's not my bike afterwards I think I'm going to fill the cylinder with fluid maybe ATF like you did simply because I have tons of ATF around the shop, And then use my Shop-Vac to vacuum out the ATF just in case there are any particles that I missed with the air.
That sounds like it'll work good.
Awesome vid!! I bought a 125cc pitbike with same problem, I already had the head off so I tapped it and works fine with bigger plug, thanks for the info!!
Thanks for watching.
How cool. I grew up on a CT70, and prior to it a lawnmower engine powered mini "Atlas" that my grandpa fabricated.
I am kinda like you, always tinkering with something. I don't like having anyone fixing anything of mine so I had to figure out how to do it myself. Great tip 65ford.
Yeah, there's a crappy feeling about letting anyone else fix your things.
you just saved me a bunch of money great vid thanks
Keenserts are good too.A slimsert May also be a option. The tape is a good idea.Makin the hole bigger was also a good idea. Good Job
Awesome little bike man!!!!!...and great job!!!!
First kick... because it's a Honda. Great video. Thank you!
Thanks.
Thanks Jason!
Good video and a real sweet Honda 70.
You are so creative, thank you
awesome repair video! i sure have learned a lot watching your videos. MERRY CHRISTmas friend!
Thanks David.
Those early 6 volt Honda 70 cylinder heads are a performance upgrade for the Honda C90E cub engines (85cc) both the C70 (72cc)and the C90E are the same bore size. The C70 head has bigger valves. The cylinder can be overbored to 79cc using the Honda XR75K1 aftermarket 80cc piston kit and the camshaft reprofiled by having 1mm ground from the base circle, the Greeks sell these aftermarket cams and using a different manifold, a larger carburettor from the Honda SL70/XL70 can be used. From my tuning files.
I bought my 72 F-100 in '97; a long time exhaust leak eroded both heads and both manifolds. I used Never-Seez on the bolts and gaskets. I loosened a bolt last summer with an open-end wrench and it turned right out w/o any trouble. In the shipyard, other pipefitters bitched about me using Never-Seez on everything. The leaks disappeared and I didn't have to go into 4 inches of bilgewater twice.
Put it on all spark plugs and they'll Never-Seez!
Hahaaaa....that's love when it starts on the first kick! Great how-to vid...AND a GREAT lil' classic bike. Real nice job and thanks again. Lotta great points, especially the idea to put on the compressed air as you're drilling to eject the shavings.
Hey Thanks.
Thanks Dusty!
Brilliant job :-)
Drilling out to the bigger size up was genius, i just didnt think about that, i was mentally stuck on keeping it the same lol :-)
And you had no problem finding the same heat rating plug?
Also you have the tap now, so if another one comes along your ready :-)
Well done!!, she rides again!! :-)
I originally put in a NGK d6ha but I think it was a little cold so I just swapped it for the hotter NGK d8hs (same plug in the 90 cc Honda trail 90's).
Thanks Knighthawk.
Brilliant job
That's good to know... Thanks.
what if you have tore up threads but you cant still get a plug in and you heat the aluminum to fill in the threads around the plug. would it work?
Good job. Outboard motors are hellish for this especially if they're in the sea but the crafty manufacturers stopped using the pencil plugs so we had nowhere to go if they stripped.
Big Ian Builds About the only option is expensive Heli-coil type inserts. Sea Water isn't nice to anything.
find a bud that can alluminum tig weld and then drill and tap it. would seriously help if your pal had a milling machine also lol.
Jamie Buckley Yes that could work if it's worth doing. A lot of the time particularly with small single cylinder engines it's easier to replace the head/block. More often than not the water jacket corrodes through long before the plug threads get damaged so the block needs replacing anyway.
thank you for the video i really appreciate the help and the options that you gave ....
ill go with the bigger spark plug ; )
It worked out really well. I hope you get yours fixed.
Thanks Harvey. -Moe
HI, This is a great post, very informative, helped me a lot! Now I am hoping you can answer for me, if the front and rear shocks on a 1970 CT 70 can be rebuilt or at least have new oil added to them? I think mine need oil, because I am bottoming out when I ride. I hope you can help. Thank you.
+flywelder I've never rebuild these myself. I assume they are made like most motorcycle shocks and have seals that tear and leak out the oil. Generally the front shocks on motorcycles are rebuildable but not the rears.
What mfr and part# plug did you use?
Thanks!
I'm in the same boat what spark plug did you use that had a shorter thread depth
Really nice fix!!
Thanks.
I just noticed my plug hole is stripped on my trx 70. I think they are the same engines. I planned on doing this repair. what spark plug did you use?
Hope it helps.
good and cheap repair bud. well done.
Jamie Buckley Thanks Man.
No problem I enjoy your videos if you want to catch a glimpse of my channel I got a couple of videos on there go to bucks shop and then I have a couple of 200 Lincoln welding machine restoration check it out but take care
What places will fix this for me ? i dont have any of the tools required for this
Where did you find the replacement spark plug? I have a Chinese 4 wheeler 225cc.
If you still it will the spark plug screw?
the hole bigger was a good idea ...that´s good to know ...thanks
Thanks. I hope it helps you out.
You posted this video some time ago, any more trouble with the plug, gotta say great idea with the compressed air, I always liked those smaller Honda's
It works great. I did it to a second Honda and it also runs/works great with the larger plug.
could you post the links to where you bought the kit to make the new spark plug hole please?
+josh steele You just need to buy the new tap. Ebay is your best bet. I went from the stock M10-1.00 to M12-1.25 plug so I just bought a M12-1.25 tap.
I just repaired a moto guzzi spark plug hole using a repair kit from advanced auto ($29). While your tip works it is far too easy to oversized hole with the drill bit. Also one must be extra careful as the intake valve partially obscures the plug hole and it would be easy to gouge it with the drill. Another thing is to make sure the tap is perpendicular to original hole. These factors makes the tip difficult for the novice.
The advance auto kit comes with inserts, spreader and a 3 step tap. First step is the original thread, second is the drill/ rename and the third step matches the insert thread.
The first step follows the original threads or what is left of them. This centers the tool and draws the tool into the head. The second step enlarges the hole so it matches the desired tapping dimension. As the tap is pulled through the third step makes threads. After tapping clean out hole, insert spark plug into insert and use red lock tight on outside insert threads. Insert must have knurled portion towards outside of head. Install plug and insert and wait for locktite to cure. Remove spark plug and using spreader tool and hammer expand the insert. IMO this method, even though seems to have more steps, is easier for the novice.
I have a 1978 Honda express nc50 with the same spark plug problem can I get any recommendations about that and whit to do
+tavish dozier The Trail 70 in the video came stock with a 10mm plug that I was able to bore up to a 12mm plug. It looks like your nc50 comes stock with a larger plug to begin with(14mm). So there isn't much room to to go bigger but they do sell 16mm plugs but it will be hard to find one with the specs you need. You can throw on a new/used head www.ebay.com/itm/1978-78-HONDA-NC50-EXPRESS-CYLINDER-HEAD-/381335110456?hash=item58c9580338&vxp=mtr or install a helicoil www.amazon.com/Helicoil-5334-14--Thread-Thread-Repair/dp/B0002SRF4O/ref=sr_1_1?ie=UTF8&qid=1441392417&sr=8-1&keywords=m14+spark+plug+repair
They do make great pit bikes.
Think a similar solution would work on an old Honda Z50 AK5? it might already use a bigger plug, not too sure. All I know is it's stripped like this, and hopefully I can get it running again with your method.
+mrSevenths Yes it will.
Great video. I have a stripped spark plug hole on my '72 Honda CL175; is 12mmx1.25 also correct for my bike? I feel I can save the original hole rather than go oversize.
If you have a 12mm plug then yes. Running a tap into it will only make it worse though as it will cut away any holding threads.
Thanks. I will have a mechanic put a heli coil in as I've never used one and don't want to make it worse.
I looked into both and more they just wanted to much for one for a 10mm spark plug. Thanks WTBM123....
Very Cool...
sixty-five Ford.......... What size drill bit did you use for the spark plug hole before threading for the 13mm×1.25 plug? I am doing the same thing on a Toa Toa 110 with stripped plug hole. Thanks man the video is awesome and helps a lot. I couldn't find a 10mm ×1.0 anywhere in Indianapolis so I ordered from China $25. Been a week and shipping info says 11 more days. So I will try this method first that you showed. Then refix when the helicoil comes in.
thanks
Hah! I have exactly the same problem with my 1970 Trail 70. But I don't have a big compressor. I don't think my little pancake compressor would do it. Think the BBQ grill trick and aluminum brazing would work?
A pancake compressor will work just fine. You may have to stop and let it ketch up. The aluminum brazing is messy and not very precise. I did attempt brazing a scrap small engine head before I did this and I have very poor results.
Nevermind I read your description and found
good option to repair. thanks for
crackbadger man Thanks.
A Save-A-Thread insert kit would work. It has a steel insert. Aluminum tends to expand and can cause that plug to pop out. Use Loct-tite high strength sealer on the threads of the insert.
Yes, but the price of a thread kit for these tiny plugs is more than just buying a brand new head. I've done a few of these now and haven't had any issues.
sixtyfiveford I forgot that the Save-A-Thread is a 14x1.25. Your method is o.k. It works by drilling and tapping it to a 12mm. It IS alot cheaper than a insert kit. In the future, if it strips out, use a Time-Sert kit. The reamer forms the seat. You run it down until it stops. The expander locks the insert in. A Heli-coil can be drilled wrong. Aluminum expands with heat. Use a EZ out to remove inserts. So, GOOD JOB!!
hi ford,i have a 1968 honda ct90,it slips gears around 2nd and 3rd sometimes.im braking my head.PLEASE anyhelp is greatly apreciated.
Sounds like the clutch is either out of adjustment or worn out.
aluminum distributes the heat to fast and i think you would warp the entire head.
Yeah, I've been using Anti Seize since the mid 90's . The issue lies in the people before you that don't.
Thanks
Thanks, I'm glad you liked it.
So I am now dealing with this issue. I have been messing with the a CT-90 for a few days and the threads are GONE. I did see the link below to the spark plug you suggested to buy, however, are you saying you only bought the tap? How did you get the tap in without a tool. I may be missing something but just wanted some clarification before I start buying things to repair mine haha.
+Conner Henderson You don't need a special tool to use a tap. You can use a tap with a monkey wrench, Vise grips, or a open end wrench if need be. In the video I find a socket that fits it good and just use my ratchet. Here's the tap you need www.amazon.com/Century-Drill-Tool-97319-Carbon/dp/B011NDEBYI/ref=sr_1_1?ie=UTF8&qid=1440995204&sr=8-1&keywords=m12-1.25+tap
+sixtyfiveford I see, I am not very familiar with taps so forgive me for stupid questions haha. So you just ratchet that tool (tap) in and basically create "new threads" on the inside of the spark plug hole then put the new spark plug in?
Yep, that's it. You just need to make sure you put a little oil on the tap(motor oil or WD40) and screw it in straight. You'll need a 27/64 drill bit to pre-drill the hole before you tap it.
Virtually all shops will just want to put a brand new head-jug on it. Your best bet is to call all your local shops.
That's awesome thanks for the video
todd vernon Yeah, thanks for watching.
Finding a the next size up plug with the same heat range was easier than I thought. I hope another stripped plug never comes along but I am prepared now. Thnaks zx8401ztv!
Im about to try this on a similar CT70. How much air pressure were you using?
Very low, maybe 5 psi. I have done a few now with this trick and they all work great.
Thank you.
I'm needing an inser for my XR100 my bike has the the weird small plug in it
what size tap was this
Went from the stock M10-1.00 to M12-1.25 plug. So a M12-1.25 tap.
I know this is old. A Heli Coil installed properly is forever and better than the factory threads in every way.
Thats a good idea using air nozzle in the intake. I think that's what I'm going to do. It sure is a sick feeling when you go to tighten in a spark plug and it starts to snug up and then it just keeps turning. 😮💩
Hey Thanks. Yeah, nothing worse than stripping out the plug.
That's awesome
Thanks..
Never mind I see it now- isn't that a higher heat range?
It is actually lower (D8HS NGK). I ended up switching it out to a hotter D6HS NGK.
That might just work for me also!
The valve seats on those engines are
Right next to the plug hole u might wanna check that out
The hole is only barely enlarged and misses the valves no problem. I've performed this on multiple Honda's without issue.
yeah i know this might be the quickest,easiest and cheapest way to repair a stripped spark plug hole but is there any downside of doing this?
I haven't found any down sides. I've done it to a couple engines now and none seam to care.
+sixtyfiveford oh glad to hear that..cause i dont have access for a repair kit right now so im planning to do this.
hi what size drill bit did you use please ?
darron greatrex I don't recall the exact drill bit size. Just one smaller than the tap I used.
ok thanks for getting back to me would a 11mm drill bit be ok do you think ?
All my drill bits are imperial. The online chart calls for a 27/64 inch(which I used) or a 10.8mm drill bit so if you had a 10.5mm that would be optimal or you can use a 10mm and wiggle it around a little to loosen up the hole to around 10.5-8. Since this is drilling into aluminum you can drill the hole slightly smaller than normal. I would test first on a random scrap.
www.carbidedepot.com/formulas-tap-metric.htm
thankyou very much :-)
Let me know how you fair.
You sound like Jack Black.
Jack Black is awesome.
This video was awesome.
...
I "think" that makes you awesome...
If not it was a cool video.
Hey, Thanks Man.
You know it. I was researching for a friend of mine, his stripped too. Even though he saw this he still JB welded it in. LMAO... I guess he didn't want to do the work to save a few bucks.
JB WELD is great in the right application. It will probably hold for a few drive cycles, but will blow out the plug at a very inopportune time.
LMAO!!!!
This cat likes to ride from county to county....
In fact, I haven't seen him riding lately...
That’s just genius , I need to do an xr 100 what size tap and plug number do you suggest
I've done this a few times now with good success. I put all the details in the video description.
About to do this on a ttr 125 wish me luck
Let me know how it goes.
sixtyfiveford well I did it it works I followed your instructions and it saved me the hassle of taking of the head and timing chain thank you so much
What size plug did u go up too
I know.... That's a project that has been on the back burner for way too long.
Is that still working today
Dario Cence It is. It was fouling the first plug a little so I went to a hotter D6HS NGK and it has worked great for the past 2 years. No issues at all.
bitchen idea with the air bro, u saved me a head ache
Thanks man.
:)
6:13 and that's why you should be wearing safety goggles!!
how about i geve u 50 buck for the parts i need for mine :D jkjkjkjk
You put a shorter plug in the hole? LOL Lower compression, etc. Sure, it works and runs. All of what 8 hp stock anyways? Wow, way too much talking about useless crap. Glad everyone else liked it.
Thanks Bourkeygx!