Fuel in engine oil - Page 2 - Honda Rebel Forum
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post #11 of 16 Old 09-13-2016, 09:10 PM Thread Starter
 
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Quick update..
I took bike out for errands today stopped/started about 7 times.. Each time I closed petcock and let bike run till turned off.
As of now *slight gas smell in oil.. Not overwhelming like before.
Letting the bike run out is very inconvenient, when I have time next week I'll run some seafoam through the carbs.
Nothing is dripping or leaking to the ground.
Also bike seems to run fine starts right up... A month ago the engine was bogging on acceleration in lower gears (perhaps not warm)
It's hard to tell as I mostly pretty heavy on throttle and jack rabbit starts becuase of congested city traffic..
Hopefully get out on some back roads soon to see how it's really riding.

Thank you guys!

05' Rebel 250
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post #12 of 16 Old 09-13-2016, 10:02 PM
 
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IMO running the bike till it shuts off is unnecessary. Not too many of us do that, and don't have issues with gas in oil, because normal fuel levels in the carb float bowl will not overflow onto the ground or into the inlet manifold, and if the petcock is shut off, the level will not get above normal. I don't know what the seafoam could be expected to accomplish to improve things.

The culprit is a float valve that is not fully shutting off against the head of a gastank full of gas and an open petcock. This may be only an intermittant or infrequent condition, but if the bike sits for any length of time like that, there will be significant leakage.

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post #13 of 16 Old 09-13-2016, 11:57 PM
 
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The culprit is a float valve that is not fully shutting off against the head of a gastank full of gas and an open petcock. This may be only an intermittant or infrequent condition, but if the bike sits for any length of time like that, there will be significant leakage.
A accumulation of small leaks between the time petcock turned on and engine start would make oil over time..

think you hit the nail head there @Duckster

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post #14 of 16 Old 09-14-2016, 12:58 AM
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I try to remember to turn mine off every time I stop, but fail miserably at it. Luckily I have never had an issue with the float valve. I do turn it off everytime that I park it at home, and let it run till it runs out off fuel while I am topping off the tank. It does take quite awhile to run out.

If I were having float problems, I would probably at least let it run for a little while after I turned the petcock off to lower the level a little and maybe crank it before I opened the petcock to try to avoid overflowing. Eventually you just need to pull the carb and fix it.

Anyone ever tried to pull the float bowl without pulling the carb?

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post #15 of 16 Old 09-14-2016, 09:12 AM
 
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Originally Posted by SoakedKarma View Post
A accumulation of small leaks between the time petcock turned on and engine start would make oil over time..

think you hit the nail head there @Duckster
Well, In a short time (like a minute or so before engine start) any small leakage would not be sufficient to overflow the floatbowl , and if it did, the excess fuel would simply be burned off on engine start. Its the small leak for a long time that causes issues.

The starting drill on my old Norton consists of a carb "tickle" where you push a plunger on each carb that depresses the float and deliberately causes a bowl overflow into the carb throat providing a rich mixture for starting. Works fine, and causes no issues with oil contamination.

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post #16 of 16 Old 09-15-2016, 01:49 AM
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.

Anyone ever tried to pull the float bowl without pulling the carb?[/QUOTE]

Yes it can be done have done it on my 250 with twin carbs so should be much easier with one



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