400 hours?!!!!!
holy crap, thats HEAPS.....
i change pistons in the 300 every 70hours or so, the 250 i have im expecting to be worse....
400hrs sounds like heaps to much.
i take it that the first piston since new?
from the photos, everything looks fine, even the piston, dont you rev it or somthing?
isnt honeing going to remove some of the nickchrome stuff in the bore?
scotch brite and backtogether i'd say......, drop a piston in though.
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