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Message: [QUOTE="Rich Rohrich, post: 1017214, member: 16241"] All I can tell you is it can be VERY difficult to determine the EXACT cause of an engine failure after the fact, but it is fairly easy to speculate. Even those of us who have been looking at broken parts for a very long time are regularly fooled by the exact causes of a problem. If the 2006 YZF250s have cam chain tensioner issues it's something new and from my vantage point (whatever that is worth) not too wide spread . That doesn't mean there can't be an issue or that Kelstr is wrong in his diagnosis, but the previous years did not have a history of tensioner failure so I would personally want more facts before condeming the current tensioner design. [/QUOTE]