Crankcase full of Gas
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  1. #1
    My Bike(s)

    Crankcase full of Gas

    1979 Yamaha xs750, picked bike up from Nephew. He said it puffed out white smoke from exhaust and stopped running. I checked the oil to find it full of gas and when I turned over the engine gas ran out the air breather. Any ideas would help. Thanks.

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  3. #2
    Just Won't Go Away !
    My Bike(s)
    Buford, GA
    The problem is one or more of the carbs. Either a float is stuck or has a leak, causing it to stick down, or the valve needle is varnished up and is stuck open. Either way the fuel flow is not being shut off when the float bowl is full, causing the bowl to overfill and raw fuel to flow down the intake and into the engine.
    You MUST obey the pug dog!

  4. #3
    My Bike(s)
    Thanks Dr.Bob, just pulled carbs and looked in float bowls good chance your right.


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