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What would cause the intake side of the piston to break off. The outside of the piston where the recess is for the intake valve broke clean off. What are some possible reasons for this? Any info. would be greatly appreciated.
The engine was running fine and just recentlly had bn gone through by a local dealer. I had them put new timing chain and new rings in for me. After I got it back from dealer the stator went out and I replaced it myself. Got it back on its feet and road for about an hour and a half then it took a dump. i thought maybe it was something the dealer did wrong but there telling me its a predetonation issue. Started asking me questions about the stator I put in it. I may be new to atv engines but I am mechanically capable. I'm just wondering if I'm getting messed with on this.
 
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