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Hi all, I bought a 2000 scrambler 400 4x4 from a friend, It trashed the piston on him, so he rebuilt it. He bored it and new wiseco piston. he said it ran about 10 min. then stoped. I tore it down and the piston and cylinder was scored.
I orderd a new wiesco piston and getting it bored again. My ? is the top of the old piston and cyliner head was rough and kind of pitted, the new one is smooth. before I put It back together should i be concernd about the rough cylinder dome? plus what do you think coused this.

Thanks for any help
 

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