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Thread: GS750 Stationary oil leak

  1. #1
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    Default GS750 Stationary oil leak

    Before I start taking things apart I'm hoping one of you Guys with far more GS experience than me could point me in the right direction please. If I put the bike on it's side stand oil will drip from under the generator cover but it doesn't leak whilst riding. I've checked the oil level and it's not overfilled

    Thanks
    1978 GS750C

  2. #2
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    On the side stand the bike is tilted to the left, so oil will migrate there.
    Could be the generator cover gasket is leaky, but not necessarily.
    Could be from the tacho connection on the cylinder head, valve cover leak, head gasket leak, etc. etc.

    Best advice is to clean the engine well and look for fresh oil seeping out somewhere.

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    Sorry, should have said that there's not a sign of oil or oil leaking anywhere else on the motor.
    1978 GS750C

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    Quote Originally Posted by Mary Hinge View Post
    Sorry, should have said that there's not a sign of oil or oil leaking anywhere else on the motor.
    If you're positive about that then maybe its under the motor. Check the oil drain plug (crush gasket) and the pan gasket.
    82 1100 EZ (red)

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    A few other possibilities that come to mind...

    1) The o-ring around the gear position switch.
    Here's a shot of the underbelly of a junked GS850 engine. The gear position switch is that round brownish gadget on the right with a wire coming out of it. This o-ring is undoubtedly glass-hard and cracked if you haven't replaced it in the last 40 years.



    You'll note that the photo mentions the Mystery Hole; this is the bottom side of what is basically a drain hole under the starter, needed so that the starter cavity doesn't collect water and drown the starter motor. Here's the top side with the starter removed. That blue tubing is only stuck in there to show the connection:


    There's an empty chamber in the castings that connects the two holes.

    2) So another common source of leakage is the o-ring around the nose of the starter. Oil can make its way from there into the Mystery Hole cavity, then collect in there and drop out when you park the bike on the side stand. This o-ring goes glass-hard and cracks after 40 years of heat cycling, but is easy to replace.

    The same goes for other oil leaks from the back side of the engine; the oil can make its way into the starter cavity and out the Mystery Hole.

    3) One very common source is the cam chain tensioner; the seal fails and drips oil.

    4) Less common is the o-ring around the oil pressure switch.

    5) You can also end up with oil here if the stator wires are poorly sealed.

    FWIW, here are my detailed instructions for rebuilding and resealing the cam chain tensioner to fix this leak. If you haven't done this, you probably need to.
    https://www.bwringer.com/gs/camchaintens.html
    Last edited by bwringer; 07-31-2021 at 01:27 PM.
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  6. #6
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    The easy thing first to do is replace the stator cover gasket...a lower bolt might have loosened up just enough to drip when on side stand . Get a genuine Suzuki gasket and avoid the cheapies!
    1981 gs650L

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  7. #7
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    Thanks for the advice Guys, much appreciated 👍
    1978 GS750C

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    If it's just a few drops, I find it easier just to put some cardboard or drip pan under it and wipe with a rag from time to time...more riding, less wrenching...
    '82 & '83 GS1100e

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    Quote Originally Posted by fast eddie 52 View Post
    If it's just a few drops, I find it easier just to put some cardboard or drip pan under it and wipe with a rag from time to time...more riding, less wrenching...
    Exactly - it's not leaking oil, it's sweating horsepower.
    1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

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    Quote Originally Posted by tom203 View Post
    The easy thing first to do is replace the stator cover gasket...a lower bolt might have loosened up just enough to drip when on side stand . Get a genuine Suzuki gasket and avoid the cheapies!
    Hopefully going to have time to get into this now and check through all of the suggestions made. I've ordered a new genuine gasket to replace that because with it being damp already who knows. Does the rubber grommet that holds the wires need any special attention/sealing ?
    1978 GS750C

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