The only repeat issue I see with the MS180 etc. is that amateurs run them with a dull chain, or dog them trying to make them do more than they were designed to do and cook the plastic around the clutch drum. Run them with the clutch drum bearing missing.... there again likely from dogging a dull chain.
Maybe amateur is unfair. I have seen MS500I's with crankcase ruined by running it with clutch drum bearing missing . I have seen them ran with the rim sprocket off until it ate the end of the drum off. Makes you wonder.
Maybe amateur is unfair. I have seen MS500I's with crankcase ruined by running it with clutch drum bearing missing . I have seen them ran with the rim sprocket off until it ate the end of the drum off. Makes you wonder.