FI light on on high revs and speed - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 17 (permalink) Old 04-24-2012, 03:52 PM Thread Starter
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FI light on on high revs and speed

Last weekend i've notest FI light on when i was riding with high speed or revs.When i will switch off and switch on engine stop switch everything is fine.But only to the moment when i will go again on high revs.
Power is OK,engine run OK,bikeis SP1 with power commander 3,SP Engeenering big bore exhaust,no flap valve in air intake,no K&N,new spark plugs (becose i had probs in winter time under 5 degreese cos no back presure with this exhaust and plugs was dead after 2,3 rides)
Anyone had ideas whats wrong with my baby?
Manual saying something about short circuit or faulty ECM
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post #2 of 17 (permalink) Old 04-24-2012, 07:33 PM
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Normally I would say to bypass the PowerCommander, and run only on the factory ECU. BUT, you mentioned a big bore exhaust? I'm assuming you mean a full aftermarket header system, like a Akrapovic or Jardine 2 into 1?
For sure your bike will run lean without the powercommander, so not sure this is the best idea, I'm just trying to eliminate the easiest possibility first.
Try it for just a little bit of a test to see if you still have your symptoms.
Hopefully SubSailor, Miller, LDH, or Madbuyer will be along shortly. They know way more than me about electrical.

edit: I see this is your first post. Welcome to the forum, hope we can help you get the problem solved.

John, 2000 RC51 #000100

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post #3 of 17 (permalink) Old 04-25-2012, 10:57 AM Thread Starter
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Oh Well... Its my first post cos its my first problem with my babe and still learning what is what from this forum
I have big bore SP ENGENEERING exhaust like this one and i lost power to about 3000rpm cos no back presure and in winter time had many problems with spark plugs becose that.But i sort it by standard exhaust only for winter time.Now i put back on my carbon one
I have another one SP1 so i'm planning to change ECM unit and then we will see what is gonna b like on high revs Will let u know about results just in case someone else will have simmilar probs in a future
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post #4 of 17 (permalink) Old 04-25-2012, 10:58 AM Thread Starter
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post #5 of 17 (permalink) Old 04-25-2012, 07:33 PM
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Define high revs please. (rpm range) Can you post up pictures of the old plugs?

Are you having temperature issues.


Lets start here....



The very first schoolbook that was written had God all over it. --Dave Mustaine
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post #6 of 17 (permalink) Old 04-26-2012, 11:10 AM Thread Starter
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When i change old spark plugs i remember they was dry but black.They should b like coffe with milk or sand but they wasn't...Have no pics of them But after change for new ones i'v done about 1000 miles and i check color of new ones and color was like it should-"coffe with milk"
I newer run my bike in a rain so i can't change ECM from another bike to check ECM is it faulty but i hope even with different ECM light from FI will still be on. It will mean something less important will b broken or faulty
By revs i mean range around 7-9000rpm
Any sugestions MADBUYER?
BTW never had any probs with temperature in my bike.Tomorow will try switch off PC3 and will put new ECM unit and we will see is this gonna make any difference
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post #7 of 17 (permalink) Old 04-26-2012, 07:55 PM
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If you unhook the PC AND install a different ECU, how will you know which one is affecting change-if any? Better try one thing at a time.

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post #8 of 17 (permalink) Old 04-26-2012, 08:15 PM
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Quote:
Originally Posted by jondog9 View Post
If you unhook the PC AND install a different ECU, how will you know which one is affecting change-if any? Better try one thing at a time.
^+1 one connection at a time...



The very first schoolbook that was written had God all over it. --Dave Mustaine
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post #9 of 17 (permalink) Old 04-27-2012, 01:28 PM Thread Starter
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Thats what i want to do.One thing at the time.
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post #10 of 17 (permalink) Old 04-27-2012, 02:11 PM
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Originally Posted by komandosv2 View Post
Thats what i want to do.One thing at the time.
Slainte, good luck.
I'm rooting for you, seeing how I'm half Scottish.

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