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‘87;Yamaha Moto 350/ gas in crankcase


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Hey, I’m getting oil coming out of the fill/ dipstick handle when running and I have overfilled crankcase that smells like gas. Would this be a sticking float in the carb?


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Sticking float or badly tuned carb that's running way too much fuel to the motor washing the cylinders down.  usually a sticking float will leak out the carb overflow though, assuming it's not blocked.

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Yeah! I have been using non ethanol fuel last fall and  It ran fine and I haven’t ridden it over the winter. Although I did start it up once a month. I’ll check your suggestions. Thanks…

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If it's done it after a long sit then you should check the fuel tap.

Lot's of perfectly fine operating float needles, that work all day long in use, will allow the engine to flood overnight...

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