Question about 1981 Yamaha XJ 650

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Have zl 900 1985 model clutch slips bad replaced clutch and fluids everything apears fine new clutch acts the same way trans shift thru all gears fine acts like clutch cable to tight but its hyd clutch any help out there thanks tracy

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  • cchatterson May 11, 2010

    what kind of oil do you have in the bike just curious because car oil will cause clutch slippage the friction modifiers in the oil are bad for a wet clutch on a motorcycle

  • Joe Stanton Apr 23, 2013

    We Have Been Using Dextron ATF In Our KX 125. The Clutch Is Solid As A Rock And Shifting Effort Was Greatly Improved. If The Clutch Plates Were Not Installed In The Correct Order In The Clutch Drum It Will Not Work Or Adjust. The Pressure Plate Should Have An Adjustment Bolt In The Center Of The Plate. This Works Against The Clutch Actuator Rod Via Slave Cylinder. Free Play Must Be Present For Full Engagement Of Pressure Plate.

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It might have a "wet" clutch like my Yamaha which means that the clutch is in contact with the motor oil. If you use motor oils that have cleaners in them to remove gunk and all that bad stuff then it can cause your clutch to slip. I don't mind the clutch slip though it keeps the bike from popping a wheelie under hard acceleration :)

Posted on Jul 04, 2009

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My 84 Honda Nighthawk had the same problem. Turns out the clutch fluid return port was plugged. It's a small pinhole in the master cylinder that bleeds pressure back to the reservoir when the clutch lever is released. Otherwise pressure builds up in the system and keeps the clutch disengaged.

Posted on Aug 29, 2013

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