Probable cause for no start. Not cranking, no fuel pump noise. - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 35 (permalink) Old 05-15-2019, 10:45 AM Thread Starter
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Question Probable cause for no start. Not cranking, no fuel pump noise.

Have just bought a tired 2002 SP2 from a friend. I'm now starting on a long road of TLC/restoration.

My first challenge is getting it to start.

I turn the key and the dash lights up - all good, but there's no sound from the fuel pump and it wont crank. I shorted out (on purpose!) the starter relay and the engine then cranks OK. So I know the battery and starter are OK.

The green neutral light is on, the kill-switch is set to run.

I've downloaded to the .pdf manual and am now starting to go through that. I've checked the 30A fuse - all good.

It has a power commander 3 fitted as well as an upmarket immobilizer that seems to disarm from the keyfob.

Your thoughts guys?
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post #2 of 35 (permalink) Old 05-15-2019, 10:49 AM
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when you toggle the kill switch does the Fi light come on for a few seconds, then go out?




if the bike won't crank (in neutral), check the fuse for the horn/tail light. that circuit runs the start button
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post #3 of 35 (permalink) Old 05-15-2019, 11:06 AM Thread Starter
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Hi Wibbly,
Thanks for the super-prompt reply.
I've just checked, when I tried your test I thought I saw the FI light flicker very briefly, so I cycled the kill switch, it came on for a split second longer. I cycled it quite a few more times and then the fuel pump came on - so I'm presuming the kill switch is suffering from corrosion or worn?
After the fuel pump stopped priming, I tried the starter and the engine cranked over (yipee ;-) ), but didn't start. I pulled the 'choke' out and tried again, but nothing. It cranks but doesn't seem to fire at all.

Gavin.
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post #4 of 35 (permalink) Old 05-15-2019, 11:09 AM Thread Starter
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PS as far as I know its a UK spec bike.
PPS its been sat unused since 2015,....
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post #5 of 35 (permalink) Old 05-15-2019, 11:12 AM
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your kill switch is flaky.




is the ground on your power commander hooked up? the little ring terminal goes to battery NEGATIVE. if you hooked it up wrong or not at all you'll have no fuel.
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post #6 of 35 (permalink) Old 05-15-2019, 11:14 AM Thread Starter
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Is the kill switch something i can remove and clean up? or the only option an new one?
I'll investigate the power commander wiring and report back.
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post #7 of 35 (permalink) Old 05-15-2019, 11:21 AM
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you can dismantle it and clean it. or jumper it out for now by connecting the black and black/white wires in the connector. then fix it once you're done testing.
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post #8 of 35 (permalink) Old 05-15-2019, 11:22 AM Thread Starter
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About 18" from the power commander box, a thin black wire comes out of the loom. This is connected to the black/-ve terminal on the battery.
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post #9 of 35 (permalink) Old 05-15-2019, 11:24 AM
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if the pc is hooked up correctly, the bike should start. jump the kill switch so the pump primes every time you key on, then try to start the bike with the high idle knob pulled.


if it won't fire, lift the tank and unhook the power commander and try again.
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post #10 of 35 (permalink) Old 05-15-2019, 11:24 AM Thread Starter
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I guess the next step is to test for a spark? I've just opened the fuel tank and I can hear fuel in there when i rock the bike from side to side.
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