1988 GSXR750J No Spark on Cyl 2&3 - Suzuki GSX-R Motorcycle Forums Gixxer.com
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post #1 of 5 (permalink) Old 06-15-2019, 09:36 PM Thread Starter
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Join Date: Oct 2013
Location: Calgary
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1988 GSXR750J No Spark on Cyl 2&3

Hi,

Been doing lots of reading and troubleshooting but still can't figure out if my '88 750 really needs a replacement CDI. Bike has been running fine for several years straight. Rode it for the first time this year about a month ago. No issues at the time. Wasn't able to get it started the other day. Can get spark from ignition wires going to cyl 1 and 4 but not 2 and 3. Same results when the coils were swapped, indicating that coils aren't bad. Primary and secondary resistance for both coils are within specs. Also tested resistance at signal generator terminal and that's within spec. Continuity between wires at ignition coils end and CDI plug end all are solidly connected. Anything else I should try before buying a replacement CDI? Any other tests I can perform on the signal generator at the rotor end? I don't have or know anyone with a compatible CDI to test with.
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post #2 of 5 (permalink) Old 06-16-2019, 01:39 PM
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Motorcycle: 1990 GSXR1100
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Re: 1988 GSXR750J No Spark on Cyl 2&3

I think you've covered everything. Sounds like you need a new cdi.
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post #3 of 5 (permalink) Old 06-16-2019, 06:39 PM Thread Starter
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Re: 1988 GSXR750J No Spark on Cyl 2&3

I should also add that voltage at both ignition coils' 4 spade connectors (2 connectors per coil) were approx 11V when ignition is turned ON and approx 7V when cranking.
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post #4 of 5 (permalink) Old 06-19-2019, 02:17 PM
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Re: 1988 GSXR750J No Spark on Cyl 2&3

I went through the same problem on a slabby Im currently fixing up. you can slide the circuit board out from the CDI box. look carefully at all the solder points, check for even the slightest, smallest of defects. My slabby had the same problem and wouldnt fire on cylinders 1 & 4, it turned out to be the white wire coming from the coil that goes directly to the CDI, the solder on the circuit board had a hairline crack. soldered it back up, now it runs like a new bike. look at a wiring diagram and verify that the power wire from the coil goes directly to the CDI
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Last edited by Gixxerider86; 06-19-2019 at 02:24 PM.
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post #5 of 5 (permalink) Old 06-20-2019, 12:55 AM
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Re: 1988 GSXR750J No Spark on Cyl 2&3

There's quite a few guys on here from Alberta, I'm sure someone has one to test try. If you were here in QC I'd be glad to help. Not sure how you can search those guys out?
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