Quote:
Originally Posted by Zynice
Decided to pull the whole motor apart. Guess I was completely blind the first time. Top of the piston had to two major crescent shapes on it from what im assuming was hitting the valves. Top piston ring was melted to the piston itself. Skirt of the piston was cracked. Bore on the bottom half had a big scratch from where the piston ring welded itself. Guessing somehow the timing got off? Gonna just use my warranty I have on the motor and get it replaced.
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Also sounds like perhaps it got hot or oil starved... unsure if still stock carburetion and jets....?
Definitely something was wrong that lead to failure. They typically don't just go kablooey.
The clunk you heard could have been some debris getting into the cam and crank timing gears, which would have chewed those up and caused them to skip, leading to valve-piston timing obviously off, and then the collision between them.