97 750 - losing cylinders between 50 and 80 Celsius - Suzuki GSX-R Motorcycle Forums Gixxer.com
 
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post #1 of 4 (permalink) Old 02-15-2017, 09:25 PM Thread Starter
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Location: Melbourne, Australia
Motorcycle: 1998 750 SRAD
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97 750 - losing cylinders between 50 and 80 Celsius

Hi all,

I've been away a while - too much work and not enough motorbike!

anyway, I've come across an 'interesting' problem recently.

The problem is that between about 50C and 80C (temperature) the bike runs on only 2 or 3 cylinders. A spray of WD40 on the headers shows either #3 or #4 will cut out at this time. After 80C the cylinders come back on and she runs normally. And yes, when started from cold (no temp reading on guage), she starts super easy and even without choke.

I have tested her out 3 times and the same behaviour each time. If she's hot, she will start and run fine. If she is cool, then she starts but loses cylinders between 50 and 80C before firing on all 4 cylinders when warmed up.

I recently replaced stator and upgraded reg/rec. Was running well, and meanwhile I have been fine tuning the carbs (Factory Pro kit) over the past weeks.

Does anyone have any ideas about what this problem is caused by..? have you heard of this before..? It is baffling: the cylinders only cut out in this temperature range...which confuses me no end...do I chase carb set up or electrical (perhaps coils)?

any ideas...?

"You could call it the Art of Fighting without Fighting..."
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post #2 of 4 (permalink) Old 02-16-2017, 11:37 PM
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I would suspect the coils breaking down with the temp. If you know what cylinders drop swap the coils and see if the issue moves
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post #3 of 4 (permalink) Old 02-17-2017, 12:37 PM
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Re: 97 750 - losing cylinders between 50 and 80 Celsius

Swap coils 1&2 with 3&4 and see if the problem follows.
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post #4 of 4 (permalink) Old 02-23-2017, 07:36 AM Thread Starter
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Re: 97 750 - losing cylinders between 50 and 80 Celsius

Thanks guys...sadly, its cylinders 3 and 4 which cut out intermittently in that temperature range...so both coils, if that's the case.

will check the coils again this weekend, but I am not too sure that a multimeter can tell me what trying two other coils would tell me...but where can I get 2 coils to see if that's the problem....!?

Are there any SRAD 750 owners in Melb Australia who are willing to try their coils on my bike for 2 minutes.....?
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