BEST way to fix a pulled out stud on a yamaha 125 1980

[yamaha driver]

Well driving this weekend noticed a massive amount of leakage around the headgasket. while taking the head off, one of the studs pulled out and the aluminum threads in the cylinder came with it. soo now i ordered a topend kit and wondering what is the best way to repair the stripped bolt. I do have another cylinder off a 82 125 should i use that or fix this one

[yamaha driver]

Also do you break in these oil injected 3 wheelers the same as a 250r

[tjrider]

You will need a heli coil kit. Check the world class help section. There is a how to in there.

[yamaha driver]

ok thanks on that. i didnt know if they were good for engine studs

[just ben]

I would be carefull doing a helicoil unless you have the right tools for the job. I had the same trouble about two weeks ago except the stud broke off. since the reason for removing the studs was to get the cylinder bored I decided to let the engine shop deal with it. When they pulled the broken stud ,the threads came with it. it cost me 40.00 for the removel and the heli coil. the helicoil kit costs about 25.00. It's well worth the extra couple bucks to have it done right. without the right tools it's almost certain the studs will end up "splayed" making assembly very difficult or impossible

[hoosierlogger]

Most ATV shops around here charge about 60 for a helicoil install. If you have never done it before, it is totally worth it. By the time you buy the helicoil kit and drill bit. you spent almost as much as the ATV shops will do it for. Plus I am willing to bet he has put in more helicoils than you can imagine. You cant put as price on experience.

[tri again]

I would be carefull doing a helicoil unless you have the right tools for the job. I had the same trouble about two weeks ago except the stud broke off. since the reason for removing the studs was to get the cylinder bored I decided to let the engine shop deal with it. When they pulled the broken stud ,the threads came with it. it cost me 40.00 for the removel and the heli coil. the helicoil kit costs about 25.00. It's well worth the extra couple bucks to have it done right. without the right tools it's almost certain the studs will end up "splayed" making assembly very difficult or impossible

Amen!
Fixing them once is bad enough.
'Right the first time' is what we all want to hear with something this drastic.
Whatever the shop wants to guarantee.
We used to use 'inserts', like a piece of pipe threaded inside and out but they take up a lot of room,
which you may not have.

[badass350x]

I myself would do away with the oil Injection system.

[just ben]

I myself would do away with the oil Injection system.I didn't even think of that. That almost always fixes stripped out threads!

[trikebandits]

Ive used thread repair inserts called Time Sert.I picked up a kit off ebay for my particular size,and was very happy with the results.In my opinion they are better than heli coils.

[fabiodriven]

Don't be skurred man. Heli-Coils are tit to install. It ain't rocket science. I've never done a Time-Cert but I'm sure they're just as good. Your threads will be better than new after the install.

[badass350x]

i didn't even think of that. That almost always fixes stripped out threads!

lol!!!!!!!!!

[Headsup]

agreed, Time sert I think holds better also, But i have used a Heli-Coil for my Exhaust. The stud snapped off and i couldnt get it out. Works Great, Just Idk Be careful No room there for errors.

[just ben]

Don't be skurred man. Heli-Coils are tit to install. It ain't rocket science. I've never done a Time-Cert but I'm sure they're just as good. Your threads will be better than new after the install.its not that they are hard to install but as a head stud it needs to be installed perfectly straight or very close to it.

[yamaha driver]

ok around here they charge around 40 bucks and only 35 for boring so... but i have a onld 125 cylinder that has a few tiny scratches from when the ring broke, same numbers and years so it should work. i ordered a 4th over size piston kit, and i belive the cylinder is standard so they should come out nicely. and i have done heli-coils just not on cylinders. thanks everyone for answering, i have a question should i mix the gas on a break in even with oil injection? or just leave it.

[atc007]

Unrelated,,but If you show up at my shop with a 4th over piston kit,and a standard bore,,that $35 aint going far!! That is a LOT of boring time and tooling. Sounds like a hone or 1st over would have been the way to go. Good luck!

[yamaha driver]

ya lol the scratches and heavy wear make it almost to far for a 3rd over piston so just to be sure i went to 4 lol