sp1 having trouble idling - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 14 (permalink) Old 01-18-2015, 04:17 PM Thread Starter
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sp1 having trouble idling

https://www.rc51forums.com/forums/showthread.php?t=56322

still having trouble guys. new fpr, air filters, plugs. it just doesnt want to idle 80% of the time. i disconnected all electronics, ecm, stuff under the tail and put dielectric grease on all connections. runs to redline in all gear very nice.

power commander currently has a zero map loaded on it. how is the fuel pump supposed to come on if the pc is unhooked? mine doesnt. the bike smells rich. this is a relatively new problem if you read the thread linked, never had this issue before.

pictures to note. looks like a crack in the ecm, although looking in it, it looks shallow cant see any electronics, and what appears to be a burnt connector. connected to the gray finned box.





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post #2 of 14 (permalink) Old 01-18-2015, 04:24 PM
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Time for a new Mofset regulator rectifryer
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post #3 of 14 (permalink) Old 01-18-2015, 04:37 PM Thread Starter
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now, what exactly does the r/r do? is that my problem?
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post #4 of 14 (permalink) Old 01-18-2015, 04:43 PM
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converts ac to dc and controls the voltage, if it is goosed (and it looks very much like it is) the voltage will be high, low or erratic which will give you all sorts of problems

I don't like the look of the ECU either
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post #5 of 14 (permalink) Old 01-18-2015, 05:34 PM Thread Starter
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is it as simple as changing out that box?

and i dont know how the ecu would end up like that.
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post #6 of 14 (permalink) Old 01-18-2015, 11:25 PM Thread Starter
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so would a weak r/r cause a low idle producing weak spark and unburnt fuel, i.e the rich smell i'm smelling?

i would think i would have starting problems/dead battery which i dont, if that were the case
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post #7 of 14 (permalink) Old 01-19-2015, 01:17 AM
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You have identified 2 definite problems, i would replace the reg/rec and the plug ( you will need to change the plug anyway to fit a mofset unit)
I would also change the ECU, i have only seen electrical components split like that due to excessive voltage
check your battery and charge rate
If the problem persists you can start looking elsewhere, happy that you have sorted your charging system out.
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post #8 of 14 (permalink) Old 01-19-2015, 02:40 AM Thread Starter
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i think i might be leaning towards your reasoning as well, dansp1. nothing on the fuel/air side has changed since ive had the bike, and everything regarding that (fpr, etc...) checks out.

how much does an ecm run?
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post #9 of 14 (permalink) Old 01-19-2015, 11:50 AM
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Better check your stator's AC voltage too.

John, 2000 RC51 #000100

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post #10 of 14 (permalink) Old 01-19-2015, 04:34 PM Thread Starter
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i get 12.9v at the battery with the bike off. a little over 13v at idle, and climb to 14v as the revs increase.

wouldnt that prove the r/r is OK?

how do i test the stator?
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