Piston on g1

[dezrcr822]

Originally Posted by CP241

I don't know if you've done it or not yet, but if replacing the rings, definitely run a hone through the cylinder first or it will likely be a wasted effort.

The original rings will wear themselves in (seat). They leave their mark in the cylinder and if you replace the rings, the new ones will not seat correctly because of the tiny (invisible to the naked eye usually) scratching/seating from the old rings where they seated/mated to the cylinder wall. Running a hone through the cylinder will cut out the vertical "scratches" from the old rings, and replace with new horizontal "scratches" and give the new rings a fresh surface in which to seat. Hones are cheap and it only takes about 30 seconds to do it.

Everytime.

[franchise78]

Well I did not hone it, but I did manage to break a head bolt. So I still have time to hone it now. Thanks again for the advice.

[Lochlin]

Originally Posted by franchise78

Well I did not hone it, but I did manage to break a head bolt. So I still have time to hone it now. Thanks again for the advice.

I did that once. A helicoil will get you fixed up.

[franchise78]

Yeah I got lucky and found another at a shop around here. It matched nice from a snowmobile. I’m just bummed cuz it took divine intervention to get the piston in the cylinder the first time lol.

[JerEazy]

Advice: buy only Yamaha head gaskets. I finally finished my half-assed rebuild. Waited for all Yamaha gaskets. The base gasket and intake gaskets were pretty much the same except the Yamaha gasket had a bit more girth to it. But the off brand head gasket compared to the Yamaha gasket is night and day. The Off brand is just a paper gasket with a metal ring. The Yamaha gasket has a piece of mesh metal pressed between paper. It’s only slightly thicker.

[franchise78]

Well hopefully it does ok because it’s put together now lol. I will do that when I gotta tear down again. Thanks for all the help