Choking on the run - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 6 (permalink) Old 08-11-2017, 03:08 PM Thread Starter
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Unhappy Choking on the run

I'm new in this forum
I have problem with my RC51
When bike run in neutral shift everything is ok. I can rev engine to the rev limit
When I ride, bike choking of 5000 rpm and don't have power.
What could it be??
Could you have such a problem?
I will be grateful for your help
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post #2 of 6 (permalink) Old 08-13-2017, 04:36 AM
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Dzien dobry (if I guess right :-) ) Marcin,

Is this a recent problem? Did it run fine before? What -if any- changes or modifications did you make to the engine?
Does it ALWAYS do this or occasionally?

No expert, but it can only be 3 things... air, fuel or electricity :-)

What I would do is:
check the airfilters if they are clean or clogged
check the wiring and connectors between altenator, voltage regulator, starting realy and battery. for burning marks or loose connectors.
Measure the AC output (over the 3 wires) with the engine cold and the engine hot. altenatoros that are partly broken will produce less once the lot it hot.
Load trst your battery, chech the DC output from your voltage regulator.
Relatively new to the SP, but owned a VFR for 19 years....

good luck

Old enough to know better, young enough not to care.
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post #3 of 6 (permalink) Old 08-13-2017, 02:47 PM
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& check your Fuel Pressure Regulator
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post #4 of 6 (permalink) Old 09-26-2017, 04:06 PM Thread Starter
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I'm sorry I did not write.. but I was in hospital..
Dutchy - You have crearly right "Dzień dobry"
I have this problem whitch my bike in this season..
Does it ALWAYS.

How i can check Fueal Pressure Regulator?
Best regards
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post #5 of 6 (permalink) Old 09-27-2017, 04:11 PM
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Lift fuel tank and prop.
At rear of throttle body, locate fuel pressure regulator. It is the unit with both fuel and vacuum hoses.
Locate the smaller vacuum hose to the diaphragm side of the FPR and remove.
Switch the key ON to start the fuel pump and pressurize the fuel line, but don't start engine.
Observe the end of the hose fitting at the diaphragm side of the FPR for any fuel flow out the end, however slight.
If there is any fuel present, the diaphragm in the FPR is leaking, and the FPR should be replaced.
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post #6 of 6 (permalink) Old 09-30-2017, 10:46 AM
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Probably not the issue, but wondering if you've done the flapper mod?
My guess would be air filters or fuel pressure regulator, (fpr).

John, 2000 RC51 #000100

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