>>166129So he ran a more-fuel-less-oil mix than you usually run in it. That's good, in that a richer mix burns cooler... bad in that the engine was somewhat starved for oil.
Here's where the compression tester is handy... honestly, it might be worth a trip to the local auto parts store to rent one. You should probably see 100-120 psi in each cylinder. Depends on the engine, but 100-120 is an average number. If you see less than 80, you've got an issue... at the minimum, rings... but if you're tearing it down that far, might as well throw in a new piston and either hone out or replate/resleeve the cylinder and know it's all good.
Without it... take the exhaust pipe/can off, y-pipe if applicable, so you can get a good look at the piston and cylinder wall. See any gouges/scrapes? Ring(s) on the top of the piston look good, not chipped or anything? Turn the engine over and look at the top of the piston... do you see any pitting or gouges in the top of that?
Anything that looks like the pic?
It does sound like the motor's due for a top-end though. Good news is 2-strokes are a lot easier to work on than 4's. (not that small 4's are that difficult anyways...)
