Piston Trouble

[yz125_894]

I had put a new wiseco piston in my bike and when i was running it and pulled the clutch in the bike died. Floated it and it did the same thing unless i cracked it to full. took the piston out and the thing is worn down 1 mm in the front and looks shot. the old piston i took out lookes perfect compared to this. Any reasons y thins happened? i broke it in correctly and the thing only has about 4 hours on it.
-pat-

 

[tristan18au]

did it have predrilled holes for the exhaust bridge? from memory i dont think the wiseco do and this will have caused it to lock up tight, from lack of lubrication on that exhaust bridge.

 

[yz125_894]

It did have the holes on the exhaust side drilled in it. I send the cylinder back to eric to see if he can do something with it because it messed up another piston. i think it might be something with the exhaust bridge.