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Discussion Starter #1
I am new here. I just bought a 99 zx6r and it runs rough. can start it up but it needs the choke on all the way. When I start taking it off the rpm rev up and down. I have to flutter the throttle to get higher rpm's then it runs great. When I come to a stop I have to flutter the gas to keep it running. When I try to put it into gear I have to have high rpms to go. i put new gas in with seafoam. yes it has been sitting for a year. I also replaced the plugs. 3 of the 4 were dirty and the 4th was white and clean. Thanks
 

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Discussion Starter #3
99zx6r choke

OK I cleaned up the carbs. Runs a little better. I can get the choke off and have it idle ok. But when I give it gas it still quits. I have to flutter the gas to get higher rpms. I also have to have the idle screw in all the way. Idle is 1200 rpm. Also when I let off the gas at a stop sign or to turn a corner it cuts out.
 

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turn the idle screws out 3 turns and adjust the idle with the idle adjuster knob (throttle butterflies). also, when you kleaned the carbs, did you take them apart (i.e. take all the jets out and clean them?)
 

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Discussion Starter #5
choke

Yes I took every screw out that I could. 2 needles had green corosion on them. one bowl was very clean ( the one that had a very white spark plug).
 

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have you considered a new set of carbs?

or have them looked over by somebody who knows what they should look like
 

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Discussion Starter #7
carbs

I thought about it. I took them off again to clean out tonight. If that doesnt work then I will take it to the dealership. Last time I didnt have a air compressor, just the carb cleaner can.
 

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Discussion Starter #8
carbs

I took the carbs off again and cleaned them out really good. It runs really good except at the beginning it has a little hesitation but it will go. Would syncing the cabs help that out? Also drained the gas again and put fresh in. Thanks
 

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good job. it sounds to me like your idle or pilot circuit is out of tune. set the idle mix screws to 3 turns out, and yes, sync the carbs (you can do it by eye).
 

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hell ya! eyeball it man.

I can sync carbs better without a gauge.

Are you certain that you actually cleaned the pilot circuits? this is a critical fuel circuit.
 

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Discussion Starter #11
carbs

I made sure all the little holes were cleaned out. The more i drive it the better its getting. How do you sync carbs by hand? I also need to take the back tire off. Is there an easy was of doing this without screwing up the alignment?
 

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I know it sounds obvious but have you considered the air filter?

The fact that two plugs are not the same, maybe this could be due to a coil breaking down, making it run lumpy?

You could try a plug chop to see the running conditions... clean the plugs and then run the bike, hit the kill switch at running revs, say 5,000 rpm. Then relook at the plugs, this might give you a few clues...

Hope these suggestions help?
 
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