signs of fuel getting into oil ? - Honda Motorcycles - FireBlades.org
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post #1 of 15 Old 08-22-2012, 10:55 AM Thread Starter
 
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signs of fuel getting into oil ?

hi guys can you help me with this one ?
how a bike should behave if fuel gets in the oil ?
what cause this ?
what are the signs ?
i own a 929 .......
thanks
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post #2 of 15 Old 08-22-2012, 11:14 AM
 
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Re: signs of fuel getting into oil ?

Your oil will start thinning out. Engine will make more noises because the oil will loose its dampening/protection capabilities. Usually means cylinder blow-by. It can be caused from too many miles, hard or easy riding or too long before oil changes. Anything that can wear an engine down. Most simple explanation is the rings are wearing out.
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post #3 of 15 Old 08-22-2012, 1:17 PM
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Re: signs of fuel getting into oil ?

How's your bike running?
How many miles?
On rare occasion, a leaky fpr can put a little gas in your oil, along with other symptoms.
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post #4 of 15 Old 08-22-2012, 1:35 PM
 
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Re: signs of fuel getting into oil ?

Is it also burning oil? Or quantity staying the same or rising?
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post #5 of 15 Old 08-22-2012, 2:27 PM Thread Starter
 
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Re: signs of fuel getting into oil ?

the bike is running fine
no signs of burning oil
the level of the oil i can't tell if is rising .........when holding the bike vertical a couple of cm in any direction makes the level of oil to change
what other signs would indicate a faulty FPR ?
sometimes after a ride or just when the bike sits it smells a little like fuel
if i have fuel in my oil ; the oil will smell like fuel ?
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post #6 of 15 Old 08-22-2012, 2:38 PM
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Re: signs of fuel getting into oil ?

Gawd I don't want to turn this into another fpr thread, cause it seems like that's the most common thing I'm always talking about. But they do fail commonly on the early 2000's Honda FI bikes.
Other symptoms are rough running at idle and low rpms. Stalling at low rpm's. Hard to restart, acts like it's flooded. Smell gas in the exhaust, smell gas when sitting. Some more symptoms that I can't think of at the moment. Can show all, some, or none of these symptoms. To test it, pull the small vac line off, turn the key to on so the fuel pump primes, but don't start the bike. Watch for any sign of gasoline coming out of the vacuum hose nipple on the fpr.
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post #7 of 15 Old 08-23-2012, 7:44 AM Thread Starter
 
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Re: signs of fuel getting into oil ?

he oil doesn't smell like gasoline ......that's a good sign i guess
it is possible to have a faulty FPR and showing no signs ?
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post #8 of 15 Old 08-23-2012, 5:16 PM
 
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Re: signs of fuel getting into oil ?

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Originally Posted by cbrosu View Post
the bike is running fine

sometimes after a ride or just when the bike sits it smells a little like fuel
Lets get back to the begining - is the only problem you have the smell of the fuel?

Cheers
Simon
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post #9 of 15 Old 08-23-2012, 5:21 PM
 
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Re: signs of fuel getting into oil ?

It could be as simple as you have it filled to the lid and leaned over and sent it right out your over fill tube onto your frame.
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post #10 of 15 Old 08-24-2012, 4:29 AM Thread Starter
 
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Re: signs of fuel getting into oil ?

the only thing i can really be sure is the smell ......it is random , it doesn't matter if the tank is full or half full and i don't smell it all the time .
the level of the oil if it rises it is to little to be sure ..... and it doesn't smell like gas
my biggest concern is if i have a faulty FPR the gas will get in the oil and ruin the engine
how much gas can get in the crank case if the fpr is faulty ?
the FPR can be faulty and the bike still run smooth ?
i can only check it on monday do to my job .......and till then i'm stressed....
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post #11 of 15 Old 08-24-2012, 8:09 AM
 
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Re: signs of fuel getting into oil ?

What's the temperature like there? If it gets warm, then the fuel in the tank will be producing more vapour which will escape through the vent, which means you'll smell fuel.

If the bike isn't braking properly, you don't start by rebuilding the engine.
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post #12 of 15 Old 08-24-2012, 8:17 AM Thread Starter
 
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Re: signs of fuel getting into oil ?

it is hot .......35 - 40 C
but the bike is in doors so........i don't think this is the case
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post #13 of 15 Old 08-24-2012, 9:00 AM
 
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Re: signs of fuel getting into oil ?

So it's in an enclosed space (ie inside). There's your answer for why you can smell it

If the bike isn't braking properly, you don't start by rebuilding the engine.
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Re: signs of fuel getting into oil ?

Quote:
Originally Posted by Sky91 View Post
So it's in an enclosed space (ie inside). There's your answer for why you can smell it


There are 2 tubes appearing out of the bottom of your left hand fairing near the back. One of these is the tank overflow vent (smaller diameter one) and i bet if you look carefully when its hot and you can smell the fuel, you wll be able to 'see' the fuel vapour. As for the oil being contaminated i would very very much doubt it.

Cheers
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post #15 of 15 Old 08-24-2012, 12:51 PM
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Re: signs of fuel getting into oil ?

OP may want to lift the tank and make sure that that the vent hose is routed properly too.
Between the overflow and the vent hoses, and the rest of the conditions he described, I think you guys are right about why he smells gas.
I was smelling gas occasionally at one point, turned out I just had the vent hose routed all wrong, and as the temp outside warmed up and so did my bike, I'd get a little whiff of fuel.
Just thinking, probably check the gasket on the gas lid too.
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