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Old 06-20-2011, 09:45 AM   #1 (permalink)
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Fuel Filter?

Hi all! I havent posted in here in a while but I need some help. I have a '04 RK classic and in the last two weekends it has been running rough and doing a lot a spitting and sputtering. It is almost been running like I have moisture in the tank or bad gas. At a constant speed while holding the trottle at a contant RPM it spits and sputters and occasionally get a blast of air coming out of the air filter. When I give it trottle it runs fine with no sputtering but I feel like the engine is lagging and not getting the power I should have. I tried running Seafoam though it to try to see if that would help and had no luck. I am so frustrated!!! Does this sound like the fuel filter needs to be changed? Any help is appreciated. thanks
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Old 06-20-2011, 11:06 AM   #2 (permalink)
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Carb or fuel infected ? Could be intake seals, spray WD40 around the intake to see if idle changes. What do the plugs look like?
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Old 06-20-2011, 11:37 AM   #3 (permalink)
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It is fuel injected! The plugs look fine, maybe a little lean in the rear cylinder. This happened last season as well and I put the bike on a Dyno. Everything looked good and all they did was just adjust the fuel to air a little but no issues! I have a power commander and a Stage 1 download.
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Old 06-20-2011, 12:03 PM   #4 (permalink)
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Check hose inside the tank, could be rubbing a hole in itself. Any codes stored? Go to the ELECTRICAL section and read the sticky on how to check for codes.
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Old 06-20-2011, 04:09 PM   #5 (permalink)
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Someone correct me if I'm wrong, but I believe poor fuel delivery (dirty filter or leak in a pressure line) will show up first when the engine demands the most fuel. It will stumble when accelerating or climbing a hill and run pretty well when less fuel is needed, as in steady speed cruise. Since you are having trouble at light load, I would suspect a sensor going bad and throwing off the light load mixture or timing. I have experience (and a manual) only for an 08 Road King so I can't help you with the specifics on your scooter but I suspect something other than a fuel system problem for you. Pulling whatever codes you can get is the best place to start.
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Old 06-20-2011, 04:14 PM   #6 (permalink)
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Check your fuel pressure, should be about 58 psi. If it cannot maintain at least 50 psi you have either a plugged filter, bad pressure regulator, fuel pump going bad, or as badinfluence said a hole rubbed though the hose that is inside the tank. If fuel pressure is ok the items listed above are in good working order, the problem would be somewhere else.
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Old 06-21-2011, 07:12 AM   #7 (permalink)
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Quote:
Originally Posted by Steve1997 View Post
It is fuel injected! The plugs look fine, maybe a little lean in the rear cylinder. This happened last season as well and I put the bike on a Dyno. Everything looked good and all they did was just adjust the fuel to air a little but no issues! I have a power commander and a Stage 1 download.
Disconnect the PC to see if the problem clears up . PCs cause symptoms from driveability issues to all out failure .
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Old 06-22-2011, 08:05 AM   #8 (permalink)
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Can you just simpily unplug the power commander even though I have exhaust and a Arlen-Ness Big sucker air firlter? Will the bike still perform?
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Old 06-22-2011, 08:45 AM   #9 (permalink)
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You can run your engine long enough to verify if the symptom clears up . You have a stage download in the ECM so you can drive the bike long enough to verify if the PC is causing the problem or not .
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