tuned engine, molycote and clutch slipping

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  • petrolhead
    Forum Apprentice
    • Sep 2015
    • 75
    • Amsterdam

    #1

    tuned engine, molycote and clutch slipping

    I rebuild my engine and tuned it with BB ?69 Wiseco?s and 29mm. smoothbores.
    Now I?m having a slipping clutch.
    It starts to slip in the higher rev?s. about 6K
    I have already changed the oil, the clutch springs (oem) and measured the plates; they are in spec.
    I also cleaned the plates and scuffed them with scotch brite.
    I maybe worried that there is oil contamination because i have used molykote on the cam journals and on a few other places.
    The molycote was recommanded in a workshop manual so should i doubt this ?

    Or could it be that plates are loosing grip because of age ? Tires age...
    Anyone has bad experience with molycote in the engine ?
    Or clutch slippage with a big bore ?
    Last edited by petrolhead; 04-05-2022, 07:02 AM.
    Under no circumstances should both hands be removed from handlebars.
    (1977 owners manual)
  • Grimly
    Forum Guru
    Past Site Supporter
    Super Site Supporter
    • Sep 2012
    • 5764
    • Ireland

    #2
    It is likely just age. I replaced a slipping clutch that measured up fine and had plenty of life left in it, but I fitted new EBC plates and three stock springs with three heavier springs, and it's perfect now. That clutch had done around 80 thousand miles and was 35 years old.
    The extra torque from your big bore (although you don't say how much or what bike) is likely enough to give it the final nudge over the edge.
    Dave
    '79 GS850GN '80 GS850GT
    Only a dog knows why a motorcyclist sticks his head out of a car window

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    • Gorminrider
      Forum Sage
      Past Site Supporter
      • Aug 2012
      • 4803
      • British Columbia, Canada

      #3
      What's "molycote"? Oil additive? Bad idea.

      Comment

      • Rich82GS750TZ
        Forum Guru
        Past Site Supporter
        Super Site Supporter
        • Jun 2018
        • 5574
        • Mifflinburg, PA / Land of Tar & Chip

        #4
        I assume he's referring to an assembly lube by

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        • storm 64
          Forum Sage
          Past Site Supporter
          Super Site Supporter
          • May 2012
          • 4585
          • Youngstown,Ohio

          #5
          Also, I'd install a new clutch cable. Even if it still looks good, I'd get a new one, or at least oil the heck out of the one you have.

          There are not many things in life that is better than a new clutch cable! 🌞
          My Motorcycles:
          22 Kawasaki Z900 RS (Candy Tone Blue)
          22 BMW K1600GT (Probably been to a town near you)
          82 1100e Drag Bike (needs race engine)
          81 1100e Street Bike (with race engine)
          79 1000e (all original)
          82 850g (all original)
          80 KZ 650F (needs restored)

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          • Rich82GS750TZ
            Forum Guru
            Past Site Supporter
            Super Site Supporter
            • Jun 2018
            • 5574
            • Mifflinburg, PA / Land of Tar & Chip

            #6
            Originally posted by storm 64
            There are not many things in life that is better than a new clutch cable! 🌞
            You need to get out more, Norm.
            Links

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            • petrolhead
              Forum Apprentice
              • Sep 2015
              • 75
              • Amsterdam

              #7
              Thanks for the posts !
              Yes the molykote i used is a grease; Mo2, it is used for bearing sufaces looks like it contains grafite, stains the same way...
              I will go for new plates; just have to dicide wich make.
              The oem disks are expensive.

              Under no circumstances should both hands be removed from handlebars.
              (1977 owners manual)

              Comment

              • Grimly
                Forum Guru
                Past Site Supporter
                Super Site Supporter
                • Sep 2012
                • 5764
                • Ireland

                #8
                EBC aren't expensive and every bit as good as OEM.
                Dave
                '79 GS850GN '80 GS850GT
                Only a dog knows why a motorcyclist sticks his head out of a car window

                Comment

                • petrolhead
                  Forum Apprentice
                  • Sep 2015
                  • 75
                  • Amsterdam

                  #9
                  Thanks Grimly !
                  Under no circumstances should both hands be removed from handlebars.
                  (1977 owners manual)

                  Comment

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