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Thread: oil on spark plugs - valve seals?

  1. #1

    oil on spark plugs - valve seals?

    1975 R90/6

    I noticed oil on the left spark plug threads. The bike runs smooth, starts up fine, the power is good, and no blue or white smoke, so I don't think the rings are worn.

    A friend suggested valve seals. I can't find these seals as a separate part. I realize the R90/6 does not come with valve seals.

    Would replacing the valve guides and valves fix this issue? Thanks for any advice!

  2. #2
    #13338 PGlaves's Avatar
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    Quote Originally Posted by salindroth View Post
    1975 R90/6

    I noticed oil on the left spark plug threads. The bike runs smooth, starts up fine, the power is good, and no blue or white smoke, so I don't think the rings are worn.

    A friend suggested valve seals. I can't find these seals as a separate part. I realize the R90/6 does not come with valve seals.

    Would replacing the valve guides and valves fix this issue? Thanks for any advice!
    Do a leak down test. If valves are found to be culprits then yes. Otherwise no. And I will add if it runs well and doesn't consume much oil you are chasing a perfection which doesn't exist in air cooled engines.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  3. #3
    Quote Originally Posted by PGlaves View Post
    And I will add if it runs well and doesn't consume much oil you are chasing a perfection which doesn't exist in air cooled engines.
    Much appreciated. Thanks.

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