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Thread: '82 R100RS Camshaft Question

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  1. #1
    Left Coast Rider
    Join Date
    Nov 2011
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    Vancouver Canada
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    '82 R100RS Camshaft Question

    Is it typical for the cam to appear offset to the tappets? I've disassembled to the engine case and it looks like only half the cam lobe contacts the tappet. Cam and tappets appear in fine condition.

    Thanks in advance for your input.

  2. #2
    jimmy armour
    Join Date
    Jul 2009
    Location
    Lucknow ontario canada
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    158

    cam off set

    hi, there is some off set to cause the cam followers to rotate for various reasons ,hope this helps ,good luck ,jimmy

  3. #3
    Registered User
    Join Date
    May 2012
    Location
    VA
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    248
    Yes. The airhead engine uses 'flat tappets' like many other engines. The base of the tappet is not actually flat but is slightly concave. Similarly, the cam lobes are not flat but have a slight taper. The combination allows the tappets to rotate and draw oil in between the tappet and cam.

    If you would like to learn more or just have a healthy skepticism, Google search using the key words 'flat tappet cam design' and a wealth of information will be provided. Also, each tappet should be returned to the respective lobe when replaced. Otherwise, it is considered best to replace or regrind the tappets and break-in the camshaft again.
    Stan

    AH# 13238

  4. #4
    Left Coast Rider
    Join Date
    Nov 2011
    Location
    Vancouver Canada
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    1,073
    Thanks folks!

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