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My friend's bike has been overheating lately and we are in the middle of an oil change right now. We took out the drain plug and the oil came gushing out, almost like water, not thick like oil should be. It smelled a bit like gas to me as well. It was maybe at 100* tops for oil temperature that came leaking out cause I could stick my finger in it and it only felt slightly warm. Is it possible for gas to have somehow leaked into the crankcase and thinned up the oil to where it would lose all its lubrication qualities?

He says after it sits for a while it's hard to start like it's flooded. I was thinking his petcock isn't really working like it should be, flooding the carbs which then leak gas into the cylinder of whichever valve is open which then slowly goes into the crankcase. Any ideas on what to check? Thanks.

Nate

my first bike did this. the float valve was bad in my carb, so if i left the petcock on, fuel would seep thru my carb and into the stock airbox which was connected to the breather tube on ym crankcase...it was situated in such a way that fuel dripped from the tank, thru the carbs and thru the airbox into the breather inside my engine. it would start but die really soon after, as you said, cuz it had lost its lubrication qualities. might check that if the stock airbox is hooked up that way. im not so sure fuel could leak thru the piston rings all that easily...unless they were shot, which would be indicated through smoke from the exhaust..some fuel can go thru the rings i think, but not as much as your indicating, assuming a time table of only so many hours. this is my guess..good luck