Gas in oil H.E.L.P - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 8 (permalink) Old 01-28-2012, 05:34 AM Thread Starter
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Gas in oil H.E.L.P

Hello fellow 51ers;
I have a problem, I was going to do a tune up on my bike and started with a spark plug change and noticed the old plugs have freash oil on them. I installed the new plugs and the bike starts up fine but wont idle without the coke on, I smelled the exhaust and smells of gas, Iturned off the bike and I took the new plugs out and they have oil on them, I then drained some of the oil from the crank case and it smells of gas, the oil is grey and cloudy looking, no white smoke out of the pipes when the bike is running, i noticed the bike started running bad after taking a long two day trip last fall, anybody know what the issues may be?
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post #2 of 8 (permalink) Old 01-28-2012, 09:47 AM
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Sounds like you may have a faulty fuel pressure regulator which is leaking fuel into the throttle body inlets.
The fuel then seeps around the piston ring end gaps and down into the crankcase.

If you lift and prop the fuel tank, locate the FPR at the rear throttle body fuel line.
There is a small rubber hose that routes from the throttle body to the regulator diaphragm dome (NOT the larger fuel return hose on the side of the regulator).

Pull that small hose off the regulator and check for any fuel that may drip or leak out. It might be better if you briefly switch the ignition on to prime the pump and pressurize the fuel rail.

If ANY fuel leaks out, the diaphragm is bad and the regulator must be replaced, which is an easy job. The regulator itself only costs about $50.

Last edited by SubSailor; 01-28-2012 at 09:52 AM.
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post #3 of 8 (permalink) Old 01-28-2012, 01:43 PM
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good call Sub, we've seen that on EFI atv's at the shop. Fuel gets past and into the crankcase and is a real beast for the owner

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post #4 of 8 (permalink) Old 01-28-2012, 02:35 PM
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Sub might be right (he usually is). If the bike was fine before you changed the plugs, and you only had the problem after you installed the new ones... It 's very likely the plugs. At work sometimes we will have bad plugs from the factory. Usually the porcelain is cracked, either from rough handling during shipping or the tech over tightened them. Sometimes the engine will run fine, but some of the voltage intended for the electrode will "seep" out and you won't have full spark. I'd double check those plugs, and the connection from the coil.
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post #5 of 8 (permalink) Old 01-28-2012, 10:11 PM
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Good time to change the fuel filter, your half way there at that point.
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post #6 of 8 (permalink) Old 01-29-2012, 03:03 AM Thread Starter
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You guys are great, I will try the fuel regulator and hope that is the issue, I will keep everyone posted on results, thanks for all that responded, I LOVE THIS SITE
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post #7 of 8 (permalink) Old 01-29-2012, 04:48 PM
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Don't forget to change out that contaminated oil.
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post #8 of 8 (permalink) Old 01-30-2012, 11:50 PM Thread Starter
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You know it, I am changing the oil with honda GN4 with new filtef Quick quwstion, will a bad fuel pressure reg. cause may plugs to have oil on them
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