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[QUOTE="Jbgabriel, post: 1293049, member: 67376"]
Well my buddy bought a basket case 85 rm 125 with a rebuilt engine. When we picked it up the motor felt like it had good compression and i looked in the exhaust port and i could see the new piston and rings. The guy said the dealer did all the engine work(new top end and crank bearings). 
Today when we try to fire it up it feels like it has no compression. I have a bunch of bikes in my garage and they all have more compression than this bike. I dont have a guage so I dont know the exact number but it was real low.
So I tore down the motor and to my surprise the motor actually did have a brand new wiseco piston and rings. One of the head studs is pretty badly stripped but the rest were pretty tight. The bore looks fresh and I even did a real light hone just for insurance. Im going to finish putting it back together tomorrow.

So what do you guys think? Was it a bad head gasket or that stud? Or are the rings not sealing for some reason? Ive been doing this for awhile and this one has me stumped.
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