Bike stalling at idle, low rpm stumbling? help

v6stanger · May 17, 2014

2009 gsxr 1000 with 5k miles.

Bike started up and took out for ride. Runs like a raped ape after 4k rpms with no hesitation stumbling etc.

At idle the bike runs lumpy and bounces around between 1k-1300 rpms. It is also hesitant up to 4k and stumbles around but clears up after that.

I came to a stop a few times and the bike will die out of nowhere. There are no FI lights displayed.

Now bike will only idle less than a minute before stalling. It will start right back up and run fine if you keep the revs up.

Never had these issues before except for a slightly bouncy idle from the yosh and bmc filter on a pc5 base map but never stalled or died like this.

Changed oil and filter a few weeks back. Ran the old gas from winter out and filled with fresh 93. No vac or fuel lines are loose under the tank. All connectors are tight. Where do I start?

Plugs fouled? Bad cell in battery?

v6stanger · May 17, 2014

Had battery checked at parts store and was putting out 12 volts and seems to have tested fine. It starts the bike up and tested ok so is this out of the question?

Pulled the air filter out to check and was clean with no blockages.

Ready to pull my hair out and burn this thing to the ground.

Exhaust is puffing and sounds like it's misfiring and stumbling around before it dies.

mythos · May 18, 2014

With no fi light on i would check compression, if good replace plugs.

v6stanger · May 18, 2014

With only 5k miles of street riding I'm guessing it's not compression or ring related hopefully. Being it's a 2009 and plugs are factory never been changed I'm hoping they are just fouled from the old gas/stabil over the winter and battery dying a few times. Will pull them tomorrow and find out. It figures the local dealer is closed tomorrow but hope parts store stocks the correct ngks. If that doesn't fix her I'll try new battery Monday. Then from there I'm thinking clogged injector maybe or something fuel related. Never had these issues and I've owned it since New.

v6stanger · May 18, 2014

Also doing the marble mod on the pair valve hose to see if that is throwing off my pc5 map while it's all apart.

Set valve removal too probably as I don't trust it now that it's a few years old. Could the servo or cables sticking cause bike to do any of this?

v6stanger · May 18, 2014

Pulled all 4 plugs today and they don't look fouled but replacing them with a new set while they are out and bike is apart. They were due anyway because of age. Will install new ones today and do pair mod today and cross my fingers.

v6stanger · May 18, 2014

Problem fixed bike is now running better than it ever was. Idle is spot on with no surging or stumbling. No issues below 4k rpm jerking around. Now it's back to running like a gixxer is supposed to lol.

I changed plugs and did the marble mod on the pair valve. Old plugs looked ok but I guess they weren't up to par.

Glad she's fixed and it was only 45 bucks for plugs and a free marble from the dollar store

unk

nightrain · May 19, 2014

I had the same problem...#1 plug wasn't firing... Do these plugs go bad just from age?

v6stanger · May 19, 2014

Yes the age and low mileage must kill these plugs. My last 06 750 went 20k miles on the factory plugs but I drove that bike year round and ran the piss out of it so they must have stayed fresh. These plugs had 5k and looked ok but apparently went bad from age and caused me issues.

V8-Snail · Dec 20, 2020

I just joined the Gixxer Forum, and I am bringing this posting back to life after more than 6 years. I just want to say thank you to all who posted the original question and provide the recommended solution. The spark plug replacements recommendation definitely work very well. A little background on my Gixxer, it is a L11 GSX-R1000, which I bough brand new in 2012. After putting 5,000 miles in the first 2 years of having the bike, I been busy and only able to ride it less than 2,500 miles in the last 6 years. The bike still has less than 8,000 miles currently and even the battery still original. Last Thanksgiving, I finally took some time to service the bike again, and she started without problem. But, when I took a ride she stumble very bad on the low RPM. I ignored it at that time thinking it was just a case of bad gas and it would clear itself later down the road. Well this issue was never got better instead got worst. I though the fuel injector got clogged and needed to be cleaned which would be pita. I googled the condition and got this recommendation. Ordered the spark plugs off ebay and replaced them last night. Took a ride this morning and no more problem. What so strange these NGK Iridium Laser spark plugs supposed to be good for 100,000 miles....

Thank you again!!!!

Bike stalling at idle, low rpm stumbling? help

v6stanger

v6stanger

mythos

v6stanger

v6stanger

v6stanger

v6stanger

nightrain

v6stanger

V8-Snail

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