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Thanks for the replies. CleanSump: Good suggestion. Yes it has vacuum lines. (#25 in the picture of post #7). The vacuum only actuates the slipper function. If there were a vacuum leak, the slipper function would cease to function. It would have no effect on lever actuated hydraulic clutch...

Your reply is confusing. Irrelevant generalizations are not helpful. The issue is not a slipping clutch but a dragging clutch. The clutch did slip at one time and it was clearly caused by oil with friction modifiers, not high mileage. The slippage was ameliorated by using the correct JASO MA oil.

Thank you for your replies. This Buell has a rather peculiar hydraulic, vacuum assist, slipper clutch which has no adjustment capability. It consists of a hydraulic piston (#35 in second picture) that pulls on a rod (#19 in the first picture) that pulls on the pressure plate (#24 in the first...

Hello Gentlemen, My '09 Buell 1125cr motorcycle (liquid cooled, wet clutch, Rotax manufactured engine - not Harley engine) is balky shifting, particularly finding neutral. It's very notchy and requires a lot more lever force to change gears than it used to. In the past it has shifted very...