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Cam lobe mishap.

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    #1

    Cam lobe mishap.

    So I was working on tappet clearances, trying to move shims around to reduce the number I need to purchase. I forgot to put a shim back into a bucket before turning the crank. The edges of the empty bucket shaved material from the edges of the cam lobe. About .75 mm on either edge of the lobe was affected. The lobe should still produce the same amount of lift right? It’s just the very edge. Or do I need to replace or have it machined? 82 GS550L BTW
    1982 GS550L
    Tags: None
    #2
    Post up a picture of the damage
    1978 GS 1000 (since new)
    1979 GS 1000 (The Fridge, superbike replica project)
    1978 GS 1000 (parts)
    1981 GS 850 (anyone want a project?)
    1981 GPZ 550 (backroad screamer)
    1970 450 Mk IIID (THUMP!)
    2007 DRz 400S
    1999 ATK 490ES
    1994 DR 350SES

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      #3
      Will do in the morning
      1982 GS550L

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        #4
        Ive done that and had no issue running the cam. Others will say youve screwed the pooch but i myself would just move on.
        MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
        1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

        NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


        I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

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          #5
          I agree with Chuck. Run it, It will find its home.
          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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            #6
            I think I agree, the only problem I can imagine would be faster wear on the lobe from reduced contact area with the shim. I reckon ill just fuhgeddaboudit
            1982 GS550L

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              #7
              Personally, I would take a very fine file or maybe even a stone and drag it at a slight angle from the center of the lobe toward the edge. VERY lightly drag it, just enough to make sure there are no high spots.

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                #8
                Ooo good idea, the scraping could have raised an edge.
                1982 GS550L

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                  #9
                  Originally posted by Johnhaley View Post
                  So I was working on tappet clearances, trying to move shims around to reduce the number I need to purchase. I forgot to put a shim back into a bucket before turning the crank. The edges of the empty bucket shaved material from the edges of the cam lobe. About .75 mm on either edge of the lobe was affected. The lobe should still produce the same amount of lift right? It’s just the very edge. Or do I need to replace or have it machined? 82 GS550L BTW
                  Don't worry about it.
                  Just don't do it again.
                  If you need to turn the engine over when a shim's out, put a coin in its place.
                  ---- Dave
                  79 GS850N - Might be a trike soon.
                  80 GS850T Single HIF38 S.U. SH775, Tow bar, Pantera II. Gnarly workhorse & daily driver.
                  79 XS650SE - Pragmatic Ratter - goes better than a manky old twin should.
                  92 XJ900F - Fairly Stock, for now.

                  Only a dog knows why a motorcyclist sticks his head out of a car window

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