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My motorcycle clutch (Yamaha Diversion) has recently started dragging extremely badly; I need to rev-match up and down gears and shifting from neutral into first requires me to rev the engine, pull the clutch, then shift in.

It's also making a squeaking/grinding noise when engaging the clutch, which typically goes away when the clutch is fully closed. The release/thrust bearing looks quite worn, so I'm going to replace that, but is there any other components which would cause the dragging and if not, how does a worn thrust bearing cause clutch drag?

It's a 2001 600cc Yamaha Diversion.

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It would help to have the model year and engine size. Please add the additional information. –  cinelli Mar 30 '13 at 23:36
    
@cinelli - added, thanks. –  slugonamission Mar 31 '13 at 0:01
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If the throwout/slave cylinder is worn or not operating correctly then the clutch will not fully disengage causing the clutch to drag and making it difficult to change gears without grinding. –  Mike Saull Apr 1 '13 at 15:31
    
@MikeSaull - fair enough, thanks. I just didn't see how it caused it originally after a quick look, but I really need to research better on how they work. Cheers :) –  slugonamission Apr 2 '13 at 15:54
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