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Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

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post #1 of 8 Old 05-29-2009, 2:00 PM Thread Starter
 
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No Spark!

Hey everyone, I've got a question for you. I bought a 929rr a couple months ago that had been wrecked, completely disassembled, and in boxes. I have got it almost completely back together now, repainted fairings back to factory paint job, but I am getting no spark.

I have checked the sidestand switch, neutral switch, clutch lever switch, diode, and most of the wiring harness (checking for continuity between sensors and ECU and also all grounds). Everything else works great, display comes on, engine cranks over w/ good compression, and fuel pump pressurizes, but no spark.

The ignition pulse generator as well as the camshaft pulse generator are working. At the coils, when the bike is turned on, there are 12V coming from the power wire. The way I understand it is that there is a constant supply of 12V to one side of the plug and the ECU grounds the other wire to make the coil spark. Knowing this, I hooked my o-scope up to the two wires at the coils, and there seems to be a pulse when cranking the engine over, but I'm not sure if it is enough of a pulse or not. Is it possible that all four coils have gone bad? I'm not sure how they were stored, but from the look of everything else, it was at least inside.

Is there anything else I should be checking? Thanks for any help!
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post #2 of 8 Old 05-29-2009, 2:39 PM
 
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Re: No Spark!

If you really think it's the coil.

Buy a coil then try switching it from one to the next.

I'd start by pulling the plug hook it up to the coil and crank it, you should see a nice big spark.

But all four being bad? Sounds wierd.
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post #3 of 8 Old 05-29-2009, 3:36 PM Thread Starter
 
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Re: No Spark!

Yea, already tried that, no spark on any of them... I'm just going to find a cheapish set of coils and try it.
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post #4 of 8 Old 05-29-2009, 3:41 PM
 
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Re: No Spark!

Ive had one coil go bad and the bike would bog down and die, but start again and repeat.

good luck
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post #5 of 8 Old 05-29-2009, 5:05 PM
 
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Re: No Spark!

have you tested the bank angle sensor?

DO YOUR DUTY IN ALL THINGS, YOU CANNOT DO MORE, YOU SHOULD NEVER WISH TO DO LESS!

GENERAL ROBERT E. LEE
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post #6 of 8 Old 05-29-2009, 5:30 PM Thread Starter
 
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Re: No Spark!

Bank angle sensor has been checked and is functional...
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post #7 of 8 Old 06-01-2009, 3:04 AM
 
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Re: No Spark!

I know you said you'd checked the loom, but me and a few others on here have had very similar issues with what your describing, the cause was a corroded connecter in the main loom that consists of grouped earths, it "bells" out but has high resistance, mine was only 10Ohms and was enough to stop all four plugs sparking.

From memory there was another post about someone who had done similar to you and had 2 connectors mixed up but you'll have to search the forums for details on that one.

This post has good images on where to locate the connector in question.

Last edited by Kelv; 06-01-2009 at 3:08 AM. Reason: Added link to piccys.
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post #8 of 8 Old 08-01-2010, 12:41 PM
 
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Re: No Spark!

i have a 1980 honda cx 500c and it was running fine yesterday and today i have no fire any ideas?
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