Oil Leak

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  • co587
    • Feb 2026

    #1

    Oil Leak

    I have oil leaking from a 9/16" diameter hole that was cast into the bottom of the crankcase housing just behind the L.H. crankcase cover. Does anybody know what that hole is for and why the oil leak?
  • tkent02
    Forum LongTimer
    Past Site Supporter
    • Jan 2006
    • 35571
    • Near South Park

    #2
    The 'Mystery Hole"

    Drains the starter cavity, which get oil in it when the seal around the starter shaft leaks. Easy fix.
    http://img.photobucket.com/albums/v5...tatesMap-1.jpg

    Life is too short to ride an L.

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    • co587

      #3
      How easy? How do you access the starter shaft seal?

      Comment

      • Brendan W
        Forum Sage
        Past Site Supporter
        • Jul 2013
        • 4922
        • Wexford, Ireland

        #4
        What bike ? The 850 starter motor can be pulled without removing the carbs. The seal is an o-ring on the front of the motor.
        97 R1100R
        Previous
        80 GS850G, 79 Z400B, 85 R100RT, 80 Z650D, 76 CB200

        Comment

        • co587

          #5
          It's a 1978 GS750

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