Bad missfire - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 17 (permalink) Old 04-05-2016, 09:53 AM Thread Starter
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Bad missfire

Hi all

Aint been on for a while, busy doing other stuff, however, I have a major problem with the sp1 (uk model)

I recently bought a sp1 track bike (still have the road bike) it has a pc3 on, set up properly on the dyno, I did a trackday on it last week and although it was fine for the first two sessions it developed a very bad misfire, so bad it was dangerous to ride

I disconnect the power commander and it was still the same, it reminded me of my road bike a few years back, that turned out to be the immobiliser cutting the engine, obviously the track bike doesn't have one fitted

I checked the plugs, the rear one was fine, the front was wet

It has a vapor dash on and starts off the kill switch and start button, no ignition key

As I said, it really feels like what was happening with my road bike

Strange that it took a couple of session for the problem to start, it was fine before that and whilst on the dyno

Any pointers folks will be really appreciated

Cheers Rob
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post #2 of 17 (permalink) Old 04-05-2016, 11:00 AM
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there is a bundle of grounds that connects to the right side of the bike at the front of the subframe. your ignition coils are grounded here. if that is loose you'll get intermittent spark.


it's also possible that you have a bad coil. i had a coil go on me on my last rc51 and it was awful to ride. it would work intermittently so it made for a wild ride
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post #3 of 17 (permalink) Old 04-05-2016, 12:44 PM
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there is a bundle of grounds that connects to the right side of the bike at the front of the subframe. your ignition coils are grounded here. if that is loose you'll get intermittent spark.


it's also possible that you have a bad coil. i had a coil go on me on my last rc51 and it was awful to ride. it would work intermittently so it made for a wild ride
1+

If the plug is wet and its only on the front cylinder it is a 95% chance that you have a front coil issue or plug. that may be ground, bad coil, bad plug, water in the plug whole, bad wire.

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post #4 of 17 (permalink) Old 04-05-2016, 03:05 PM
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Battery connection is coming loose
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post #5 of 17 (permalink) Old 04-05-2016, 05:09 PM
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Battery connection is coming loose
1+ check that. On my previous rc the po had stripped the negative battery bolt it was not obvious and only occasionally happened.

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post #6 of 17 (permalink) Old 04-06-2016, 07:58 AM
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also check for worn or rub spot on coil wire. could be it is rubbing through insulated wire
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post #7 of 17 (permalink) Old 04-06-2016, 04:38 PM Thread Starter
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Hi Guys

Thanks for your input

I have put some new plugs in, took her out for a blast, still missing, checked the plugs and they were fine, will have to investigate further

Cheers Rob
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post #8 of 17 (permalink) Old 04-11-2016, 09:41 AM Thread Starter
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Really stuck here

Had the bike on the dyno, run it for ages so the bike was real hot, didn't miss a beat, no misfire at all

I cant understand why it would not do it on the dyno but will do it out on track after a few sessions

Confused, any more pointers

Rob
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post #9 of 17 (permalink) Old 04-11-2016, 09:43 AM
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replace fuel pressure regulator


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post #10 of 17 (permalink) Old 04-11-2016, 09:47 AM
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Bank Angle Sensor
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