Spark Plug Issue - Suzuki GSX-R Motorcycle Forums

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post #1 of 5 (permalink) Old 03-08-2015, 08:37 AM Thread Starter
Join Date: Mar 2015
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Spark Plug Issue

I have recently serviced my L1 and changed the spark plugs NGK CR9EIA-9 and the engine was running fine prior to change but now it has a flat spot and on idle the needle is jumping any ideas?

At low revs its like bogging down and then picks up as soon as the revs go up, I have got a power commander fitted

Last edited by Derhi04; 03-08-2015 at 08:55 AM.
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post #2 of 5 (permalink) Old 03-08-2015, 01:34 PM
You should listen to me. No, seriously, listen to me.
Join Date: Oct 2008
Location: Santa Barbara
Motorcycle: Blue 2006 GSX-R1000
Posts: 7,500
Re: Spark Plug Issue

Make sure the coils are properly seated on the plugs. Off hand, it sounds like you didn't get all the hoses back where they belong.
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post #3 of 5 (permalink) Old 03-10-2015, 06:16 PM
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Join Date: Aug 2008
Posts: 134
Re: Spark Plug Issue

If everything else checks out, change all the plugs again! Unless you are able to locate a bad one by trial and error. Those Iridiums are sensitive little Fockers! If one was dropped, forget it. I've had trouble with 'em on 2 bikes already...
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post #4 of 5 (permalink) Old 03-10-2015, 07:25 PM
Join Date: Aug 2010
Location: Melbourne, Australia
Motorcycle: K1 1000, K7 750
Posts: 3,858
Re: Spark Plug Issue

Following on from nightrain I came across an interesting post a couple of days ago where it appears a couple of other forum members experienced problems with Iridium spark plugs.

Read post #22 which also contains a quote to an earlier post where someone experienced the same issue.

I had a very similar issue a few days ago after really giving my 750 some juice for a few minutes. Started experiencing hesitation, poor throttle response and power. Limped the bike back home. Took it for a ride the next day and everything seemed to be fine again.

However, no one reported a jumping tacho needle so maybe it's not the same issue. Just worth noting in case someone ends up chasing their tail and doesn't consider the spark plugs.

Last edited by kwaka10r; 03-10-2015 at 07:25 PM. Reason: forgot thread link
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post #5 of 5 (permalink) Old 04-01-2015, 07:52 PM
Join Date: Jun 2006
Posts: 327
Re: Spark Plug Issue

Had similar issue. Chased around everything only to find the plugs that had low mileage and looked brand new were bad. Had surging idle, poor response etc.
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