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So here it is. I need help. Cant figure out what happened / what went wrong. Ive got one piston that was clearly seized. The other one is pretty oily, but no scaring / broken metal shards.
The blown side has -
1. Rave valve spring broken.
2. Piston head was seized to the cylinder. I beat it out to get the cylinder off.
3. The top of the piston is all marred, and the underside of the head on that side shows the same sort of marring.
4. The blown piston has no oil / fuel sitting in the bottom of it, while the other one is pretty full of an oily mixture.
5. The top most piston ring on the seized cylinder is fused in there. There is not float / play in the ring. Its fully seized, while the second (more bottom) looks fairly normal.
6. The piston rod on the seized side has a lot more play in it than the non-seized side.
7. There are clearly metal shards that were jamming the piston to the cylinder. They came loose when I banged the piston down to get the cylinder off. There are still some of the shards in the bottom of the crank case (they appear to be copper??).
8. There is very very minimal scarring on the blown side cylinder. 2 small, finger nail detectable markings on it. But not blown up and totally destroyed like Ive seen in many other posts.
9. The ring (or gasket, or whatever it is) that sets the rod against the crank shaft has a tab like thing that is coming off of it. The other side (non-seized side) doesnt show any of this.
My issue - I thought it was going to be a disintegrated piston ring that blew, caused the piston to seize against the cylinder, and voiloi, my problem was detected. Seems now like it may be one of the rings that sets the rod on the crank.
Any ideas? What should I be looking for / what route should I pursue as I continue this tear down process??
Much appreciated.
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Sled has about 3000 miles on it. Always run VES. Blew at low altitude in AK (normally ride at altitude in Utah). Just had a new primary put in less than 500 miles before.
Any other info that would help???
The blown side has -
1. Rave valve spring broken.
2. Piston head was seized to the cylinder. I beat it out to get the cylinder off.
3. The top of the piston is all marred, and the underside of the head on that side shows the same sort of marring.
4. The blown piston has no oil / fuel sitting in the bottom of it, while the other one is pretty full of an oily mixture.
5. The top most piston ring on the seized cylinder is fused in there. There is not float / play in the ring. Its fully seized, while the second (more bottom) looks fairly normal.
6. The piston rod on the seized side has a lot more play in it than the non-seized side.
7. There are clearly metal shards that were jamming the piston to the cylinder. They came loose when I banged the piston down to get the cylinder off. There are still some of the shards in the bottom of the crank case (they appear to be copper??).
8. There is very very minimal scarring on the blown side cylinder. 2 small, finger nail detectable markings on it. But not blown up and totally destroyed like Ive seen in many other posts.
9. The ring (or gasket, or whatever it is) that sets the rod against the crank shaft has a tab like thing that is coming off of it. The other side (non-seized side) doesnt show any of this.
My issue - I thought it was going to be a disintegrated piston ring that blew, caused the piston to seize against the cylinder, and voiloi, my problem was detected. Seems now like it may be one of the rings that sets the rod on the crank.
Any ideas? What should I be looking for / what route should I pursue as I continue this tear down process??
Much appreciated.
-------
Sled has about 3000 miles on it. Always run VES. Blew at low altitude in AK (normally ride at altitude in Utah). Just had a new primary put in less than 500 miles before.
Any other info that would help???
