1998 CBR900RR no spark - Honda Motorcycles - FireBlades.org
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post #1 of 7 Old 06-10-2019, 7:30 PM Thread Starter
 
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1998 CBR900RR no spark

Hey everyone, I've tried everything to get my FireBlade to start up but cannot, for the life of me, get a spark out of any of the plugs. I've downloaded the manual for my bike and have tested everything to trace the problem back to my ignition pulse generator. It isn't making the 0.7V minimum that the manual says. In fact, it's making maybe 0.01V max right now. I bought a new one and it didn't work, so I figured it was a faulty generator, so I got a replacement. That one still isn't producing any difference in voltage! As of now I'm at a complete standstill. Am I missing something? What would any of you suggest for me to do? I really want this bike up and running
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post #2 of 7 Old 06-10-2019, 9:58 PM
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Re: 1998 CBR900RR no spark

Hey there Meaty, have you checked the Zener Diode in the ignition switch? There is a pink wire that goes to the ECU, if the ECU doesn't see about 9vdc on it, it won't let the plugs spark.

My 99 900RR Track Build Link:Track Build 900RRX

My Red Rocker 93 Build Link: Café 900RRP
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post #3 of 7 Old 06-10-2019, 10:50 PM Thread Starter
 
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I have not checked that... I bought it a couple of weeks back and it had no key, so the guy that I bought it from had bypassed the key ignition so I just use a flat head screwdriver to work it. It's just the pink wire then? What should I be looking for?
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post #4 of 7 Old 06-10-2019, 11:38 PM Thread Starter
 
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Okay, so I've just checked the pink wire plugging into the ECU and it's showing about 11V-12V, but I found and looked up how to test a zener diode and it seemed had incredibly low or no ohm resistance to it
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post #5 of 7 Old 06-12-2019, 1:07 AM
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Re: 1998 CBR900RR no spark

Quote:
Originally Posted by meaty.mango View Post
Okay, so I've just checked the pink wire plugging into the ECU and it's showing about 11V-12V, but I found and looked up how to test a zener diode and it seemed had incredibly low or no ohm resistance to it
Your Diode is bad. Pretty sure you can’t test resistance on it, but the 11-12vdc is why you don’t have spark. Needs to be just about 9vdc. That Diode needs to be replaced. An ignition from China WILL NOT provide the diode. You may need to Amazon one or if you have a local electronic shop around.

I had to add one on my track 99 900 when I went to a toggle switch for ignition. Take a 9v battery and put it in line on the pink and see if you get spark.

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My 99 900RR Track Build Link:Track Build 900RRX

My Red Rocker 93 Build Link: Café 900RRP
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post #6 of 7 Old 06-12-2019, 2:34 AM
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Re: 1998 CBR900RR no spark

Bloody hell, Ian. With all that electrical knowledge you'd better watch out that you're not called upon to recommission 'Old Sparky'.
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2018 CBR1000RR SP2 / 2004 CBR1000RR / 2003 CBR954RR / 2001 CBR929RR (Erion Racing Edition)
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post #7 of 7 Old 06-13-2019, 12:40 AM Thread Starter
 
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Alright, I read some other forums on the zener diode and have found one to ship to me in a couple of days. I've concluded that the old diode is for sure shorted out and needs to be replaced, though I'm not positive that it will fix everything. That will be something learned after I get the new diode. Kinda bummed about RadioShack disappearing... There aren't any other electronics stores near me anymore
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