Hi guys, new to all of this .. I have brought a Ktm 250 sx 2002 I believe ?!?! Anyway I've had some issues about piston and cylinder about scores down the barrel just want abit of advice ?!?! Cheers
If the "scores" are light colored then it may be streaks of aluminum indicating a near-seize. You can clean those streaks off with sandpaper. If the scores are gouges then you may have some compression loss which would reduce engine power. Those gouges happen from ingesting muddy water or just by the air filter not having been maintenanced for a long time and it having let small dirt particles get by.
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