CorralLookin
New Member
Hey guys, I inherited this 372 X-torq with a broken piston. A chunk of the skirt on the exhaust side was broken off and there were metal shaving in the exhaust. The cylinder was badly scored.
I went ahead and replaced the piston and cylinder with OEM parts. I broke in the new top end properly, and have been running it a lot ever since (1 year ago). It had been running great with no complaints.
Today, it died on me. When I went to restart it, the motor was locked up. I pulled it apart and this is what I found:
Plug looks a little lean, but not terrible IMO.


Piston is all chewed up around the top edge. Intake and exhaust side are scored. I took out the the rings. The bottom one came out easily, but the top one was partially stuck on the exhaust side. I don’t think due to excess carbon… it was just kinda pinched in there.




Big gouge in the cylinder and metal shavings fused into the top.


I’m guessing it overheated… but why is the top edge of the piston all chipped up? Never seen that before. I’d appreciate any insights!
Thanks,
Chris
I went ahead and replaced the piston and cylinder with OEM parts. I broke in the new top end properly, and have been running it a lot ever since (1 year ago). It had been running great with no complaints.
Today, it died on me. When I went to restart it, the motor was locked up. I pulled it apart and this is what I found:
Plug looks a little lean, but not terrible IMO.


Piston is all chewed up around the top edge. Intake and exhaust side are scored. I took out the the rings. The bottom one came out easily, but the top one was partially stuck on the exhaust side. I don’t think due to excess carbon… it was just kinda pinched in there.




Big gouge in the cylinder and metal shavings fused into the top.


I’m guessing it overheated… but why is the top edge of the piston all chipped up? Never seen that before. I’d appreciate any insights!
Thanks,
Chris