looking in from the exhaust the piston looks like it has some tiny scratches? i thought the sleeve getting chromed out like that meant that the piston was worn in with the sleeve. there isnt any visible scratches on the sleeve itself . has good compression runs good and has had a clean air filter on it . the air here isn't dry and dusty . I did a heat cycle break in on the motor that a postor named fuelman posted in some forum a while back. but decided i would let it idle through a half tank to finish it off. idk im just calling it good. if it makes it through another gallon or two then im happy. lesson learned