interesting, but this motor is practically new, i got it during aug? can this still happen, and if anything ive been running it leaner i think not cooler, but let me know
remove the plug, spin the engine over by the flywheel with a finger. If it rotates very freely without the piston actually sticking when it gets near the top of the stroke, it is shot.
If you still have a nice tight pinch, then I am wrong.
It only takes a couple tanks of fuel running them too cold to ruin the pinch. Once the pinch is gone or nearly gone, nothing can be done except replace it.