1989 750 no spark please help - Suzuki GSX-R Motorcycle Forums Gixxer.com
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post #1 of 5 (permalink) Old 06-16-2018, 09:26 AM Thread Starter
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Join Date: Jul 2016
Location: Norway
Motorcycle: GSXR 750K
Posts: 15
1989 750 no spark please help

I have a 1989 750 and I have been trying to start her for some time. I've spent alot of time on this and I am completely stumped.

She has.

New Battery and new plugs,

Approx 14 volts at the battery terminals, fully charged. I'm getting almost the same reading from the battery to the coils with the ignition (key) off. When I turn the key it drops to approx 12 volts. (from the battery to the coils)

The coils test good as per the workshop manual with regard to resistance.

The signal generator also is with spec as per the workshop manual with regard to resistance.

I've had the CDI tested in another bike and its good also.

I still cannot see a spark visually but I'm not sure how difficult this is, or how dark it needs to be for me to see it. But I've covered it and got quite close and cannot see any spark.

Everything electric works, indicators lights and it cranks over very strong.

Just had the best start to the summer here in Norway and I've been on 4 wheels:

Please someone must have some Idea that I'm not seeing. In the workshop manual the only 2 trouble shooting ideas for no spark is to replace the CDI or the signal generator.

Any Idea would be super appreciated
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post #2 of 5 (permalink) Old 06-16-2018, 02:02 PM
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Join Date: Jun 2013
Location: south of England
Motorcycle: GSXR1186N mainly, plus a few others I've bought over the years
Posts: 1,012
Re: 1989 750 no spark please help

I would change the HT leads and plug caps - or at the very least unscrew the plug caps, trim the HT leads 5-10mm and screw the plug caps back on - this will ensure there's good contact between coils and plugs. You should be able to see the spark in shaded light.
You could always fit stick coils...they work well.
It's been a good summer so far in northern Europe, hope you get it sorted soon.
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post #3 of 5 (permalink) Old 06-17-2018, 01:11 AM Thread Starter
Squid
 
Join Date: Jul 2016
Location: Norway
Motorcycle: GSXR 750K
Posts: 15
Re: 1989 750 no spark please help

Thanks Nick for the reply, The leads tested ok, 34K OHM lead to lead, I had one cap that was not good and I have replaced it. I'll trim the leads back and see if that helps. Thanks again
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post #4 of 5 (permalink) Old 06-19-2018, 04:57 PM
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Location: New Zealand
Motorcycle: 1990 GSXR1100
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Re: 1989 750 no spark please help

When was the last time you saw this bike running?


Do you think it's fair to assume that if your battery, cdi, signal generator, coils ht leads and spark plugs are all functional then you have some sort of wiring issue?
Are your previous posts regarding blown fuses etc all resolved?

You shouldn't have voltage at coils with the ignition switch off. How are you measuring that?



Quote:
Originally Posted by bartNOR View Post
Approx 14 volts at the battery terminals, fully charged. I'm getting almost the same reading from the battery to the coils with the ignition (key) off.
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post #5 of 5 (permalink) Old 06-21-2018, 06:32 AM
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Join Date: Jun 2011
Location: Godmanchester
Motorcycle: 1988 gsxr7/11
Posts: 21
Re: 1989 750 no spark please help

Get yourself the wiring diagram and start following it through!!!

The Suzuki manual wiring diagram isn’t as good as the Haynes manual version - get that if you can!

I agree...

“You shouldn’t have voltage at the coils with the ignition off...”

Last edited by jjgixer; 06-21-2018 at 06:38 AM. Reason: Giving credit to another persons observation!
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