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Message: [QUOTE="oldguy, post: 1322351, member: 16965"] This advice even has drawbacks when buying a used 4 stroke. We bought an 07 YZ250F from the dealer we buy all our bikes from- the bike had been a racebike for an AX pro rider and he had less then 4 hours on it before he got his 08. At the 12 hour mark we did have a valve breakoff and drop in destroying a major portion of the engine. This can happen with a new, lightly used (highly maintained), or old beater- 4 strokes are a gamble :bang: BTW here is what the piston looked like in ours [/QUOTE]