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Old 05-19-2011, 03:57 PM   #1 (permalink)
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Gas in Oil Question

A lady i work with took her Sporty out for a ride yesterday. Two miles from home it made unusual noises and ran poorly, so she turned around and went back home.

When she removed the cap and looked into the oil, she noticed a fair amount of gas was in the tank mixing with the oil.

She is of the impression that it's the fault of her petcock not shutting off completely.

To my mind, even if the petcock was left on, gas shouldn't get into the oil. To me, this is more an indication of a bad carburetor float valve not shutting properly.

Anyone care to teach me how this happens if i'm looking at this wrong?
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Old 05-19-2011, 04:22 PM   #2 (permalink)
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Someone though the oil tank was the gas tank
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Old 05-19-2011, 04:30 PM   #3 (permalink)
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Always shut off your petcock over time gas will seep past the needle valve and gas will fill up your crankcase.Cange oil asap you can blow up the motor like this!!!

this is one of the main reason why VOES was invented cause everybody wasnt shuting off their fuel and blowin their motors and trying to warrenty them....
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Old 05-19-2011, 04:32 PM   #4 (permalink)
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You need a hung-up float or float valve plus an open petcock to get gas in your oil when the bike's sitting. The carb should have also spewed gas from the overflow if this happened, so there would have been a puddle of gas under the bike, too.

Gas comes up through the main jet, runs down the intake and into the cylinder. It leaks past the rings and ends up in the bottom of the motor, getting mixed with the oil when the bike's started.
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Old 05-19-2011, 04:35 PM   #5 (permalink)
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When a bike sits for a bit itll seep.....
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Old 05-20-2011, 08:44 AM   #6 (permalink)
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Hmmm, i don't remember her saying anything about a puddle of gas under the bike... just in the oil. I'll have to check.

So... am i to understand that even if everything is working correctly (jets, float, etc.), if the petcock is left open, gas can still seep into the oil tank? Gotta tell you, i'm not impressed by that!
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Old 05-20-2011, 08:47 AM   #7 (permalink)
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Itll seep thru the carb into the crank case....There will be know puddle under the bike at all.Once you fire the bike the gas in the crankcase will circulate thru the oil bag and mix....most needle vavles are made of rubber tips and itll always seep speacial with the ethanol fuels we have now...
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Old 05-20-2011, 09:03 AM   #8 (permalink)
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Quote:
Originally Posted by Badassbrutus View Post
....most needle vavles are made of rubber tips and itll always seep speacial with the ethanol fuels we have now...
Ahhhh, now i see. Thanks, Babs. I appreciate the lesson.
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Old 05-20-2011, 10:53 AM   #9 (permalink)
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No worries Ive learned that leason on a couple bikes the hard way..
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