Question about 2004 ATK 450 Enduro

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Clunking nois I have an 450 Enduro At rpm''s below about 4k

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There is a loud non-rythmic crunching/clunking noise. I suspected it would be either the clutch or transmission but I removed the oilpan and visually checked the transmission and oil pump and have completely disassembled the clutch, and none of these areas has any signs of malfunction. I also checked the chain/sprockets and nothing seems to be wrong there. Any ideas? The problem arose after a 600 mile road trip I took, which was the first long trip I had taken on the bike. I had used it for commuting for a few months prior to that. The first to second gear shift had gotten progressively more rough, to the point that sometimes it would not shift until I tried several times. I figured the transmission was having problems (this was my first bike so I had to learn now to use a clutch and not shift roughly), but it passed my visual inspection. The noise sounds as though there is a lose part that is getting tossed around inside the engine by a part that rotates with the engine rpm''s. If anybody has any ideas I would really appreciate it!,Cam Chain, Cam Bearings? Cam chain tensioner? these are likely suspects.,,,

Posted on Nov 10, 2008

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