Fuel smell - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 13 (permalink) Old 07-02-2013, 02:05 AM Thread Starter
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Fuel smell

Hey Friends, I have noticed a time or two when I am undoing my bungee net off the back of my bike I am smelling fuel out of my exhaust after the bike is shut off. Not like raw gas like when you smell when your fueling up and not like normal exhaust but almost like a flooded smell. Bike seems to run strong and starts right up the next day. Any ideas, far as I know the bike is stock. Oh it dose have bigger rear sprocket and a speedohealer but I wouldn't think that would have much to do with it lol. Thanks

Last edited by Sequoyah; 07-03-2013 at 12:49 AM.
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post #2 of 13 (permalink) Old 07-02-2013, 02:11 AM
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You could start the inspection from the simple things like the Fuel Pressure Regulator.

https://www.rc51forums.com/forums/sho...sure+regulator

if that checks out, then you could proceed on a spark plugs' visual inspection to see if both cylinders are running reach.


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post #3 of 13 (permalink) Old 07-03-2013, 12:57 AM Thread Starter
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Will check the fpr. Thank you MakisRC51
Only have had the bike for like 2 weeks bought it from a stealership they said they did a full service and had to change plugs because they where starting it and not letting it warm it up so it fouled the plugs.
Thanks again.
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post #4 of 13 (permalink) Old 07-04-2013, 09:26 AM
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Are you sure the smell is coming from your exhaust? I had a similar problem years ago and iirc, it was just a disconnected (vent?) hose under the tank. In my case, the smell was just unburnt fuel.
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post #5 of 13 (permalink) Old 07-04-2013, 01:41 PM Thread Starter
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Yes a friend of mine and I where looking at it the other day. He said something about when I pulled up he thought it smelled like it was running way rich. I fired the engine back up and we where huffing gas fumes out of the exhaust lol... ahhh RC51 exhaust heard that was the good stuff lol. Bike is going into shop to get new tires Saturday so I will have them look at it. Thanks oVTo for the input.
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post #6 of 13 (permalink) Old 07-05-2013, 01:22 PM
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Spark plugs and even check the spark coming from the coils. A weaker spark may allow the bike to seem to run fine.
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post #7 of 13 (permalink) Old 07-05-2013, 11:28 PM Thread Starter
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Spark plugs and even check the spark coming from the coils. A weaker spark may allow the bike to seem to run fine.
I have been thinking a hotter plug may try coils. Can you check the volts from your coil with a volt meter? I will do some research on it.
Thanks for the thoughts.
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post #8 of 13 (permalink) Old 07-08-2013, 09:04 AM
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No, you can check the voltage going to the coils, but I wouldn't do anything with the output except ground the plug and look at the spark. It's pretty obvious what a good spark and a weak spark looks like. A plug's heat range does nothing to the coils. The coil only knows to supply voltage.
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post #9 of 13 (permalink) Old 07-08-2013, 10:02 AM
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Quote:
Originally Posted by Sequoyah View Post
Yes a friend of mine and I where looking at it the other day. He said something about when I pulled up he thought it smelled like it was running way rich. I fired the engine back up and we where huffing gas fumes out of the exhaust lol... ahhh RC51 exhaust heard that was the good stuff lol. Bike is going into shop to get new tires Saturday so I will have them look at it. Thanks oVTo for the input.
I second Makis' request to switch the key on to pressurize the fuel rail, then switch off, pull the hose off the fuel pressure regulator diaphragm side, and see if any fuel is dripping from the fitting.
There should be none. If you do see fuel, then the FPR diaphragm is shot and is allowing fuel to back flow into the throttlebody.
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post #10 of 13 (permalink) Old 07-18-2013, 06:56 PM
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I second Makis' request to switch the key on to pressurize the fuel rail, then switch off, pull the hose off the fuel pressure regulator diaphragm side, and see if any fuel is dripping from the fitting.
There should be none. If you do see fuel, then the FPR diaphragm is shot and is allowing fuel to back flow into the throttlebody.
+2. My bike always smelled gas if parked.
Finally changed the FPR, problem gone, starting better, no more hick-ups.
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