i just put in a new piston about 3/4 of gallon ago. so that can't be the issue.
the motor was on it's second gallon when i started to run the gen 2 fuel from byron. the piston and sleeve were out at about the full gallon mark. a guy i know had a motor deal with race factor so he was able to replace the piston for, not the sleeve. don't ask about only the piston, just that it was just the piston. i will take what i can get for free if you know what i mean. i started running tq fuel since about the beginning of the first full gallon. have ran the motor great for the last gallon and a half on tq fuel. always using after run oil, watching temps and performance.
but this is something that many people from any forum have not seen, just seems odd to break in that particular spot
Why was the piston/sleeve done at 1 gallon?
Running overly rich will cause excessive wear and strain on the crank pin and rod bushing.
I've got 5 gallons on my PTM 3R.....all original internals.