hello, im new to the forum. just recently aquired a 91 ninja 600 (C) version. it was sittin in front of my frens houz for awhile. i made an offer and it was mine.i recently cleaned the carbs. it runs a lot better but a little rough. when i roll the throttle slowly its alright, but when i roll quickly,it almost dies, or hesitates, stutters, until the engine kicks in, or else it dies. any ideas. when ridin its kinda of slow up to 4rpm, but after that it pulls good. thanks for any input.
91 ninja, rolling throttle quick makes bike...
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sounds like carbs need to be cleaned.
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have you rejetted it? Could the jets be too big?
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Only thing I can say is to wait for someone who knows a bit more about internal cumbustion engines than me posts hehe. Hopefully Ken comes along and helps ya 
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im new to the bike world but just introducing myself as another fellow owner of a 95 600c but when it comes to engines I dont know much about cleaning carbs etc.. but by spring time I hope to learn alot more once I start changing the oil and other stuff off it.
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get yourself some aunt jamima's or mrs. butterworth's and soak the carbs in that
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169 Posts
your problem is not in dirty carbs.... there not in sync.... you need a sync tool that mesuars the air that each carb is sucking... there pretty cheap if you get a cheap one.... other than that if your not running hot, or dont smell like your running rich your probobly just do for the syncronizing, if each carb is sucking the same ammount of air, then there wont be one or two holding other ones back... witch is probobly what your experiencing :grin:
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hmmm... with a K&N air filter you might need to rejet... Sometimes you can get dips in your power band but to me this doesn't sound like a dip. *shrug* I just go by the rule that you need to rejet anytime you change the air flow.
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There are often similar problems with certain sport quads. It is sometimes due to a too small pilot jet.Since the pilot jets operate at idle to 1/4 throttle, you may want to try one size larger pilots before doing any major work and see if the problem goes away.
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Any Kawi dealer can tell you what the OEM size is via his microfisch. I think I would first pull the pilot jet and read the number on it to make sure it is actually the OEM size, especially if you bought the bike used. Then you could buy the next size larger. Don't forget to get a new valve seat also.
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The valve seat is the part that the float valve sits in when the float tang closes the valve. Closing the valve shuts off the gas when the float reaches the optimum level. Most people recommend replacing both the valve & the seat at the same time. They shouldn't be more that a couple dollars altogether.
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anyone know of a site online that goes threw carb rebuilding, or anything like or close to?.... ive already seen that site thats in the sticky at top of forum page, but dont really go into any details....
its probly not this simple but one of the spark plugs could be fouled out... only reason i say is on my old motorcycle (and old kz440! lol) kind of the same thing happened and i cleaned the carbs and it ended up being a bad plug.... but hey i learned how to clean my carbs for the first time.
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did you remove the gas that sat in frnt yor frns hose, it is nodoubt bad. Spend 10bucks on a set of good plugs. Clean out bad gas refil with high octan gas. Then pull the air box off. start the bike nurse it up to about 6 grand and spray carb cleaner into the rear of each carb,this will stall the motor so you will have to do it in waves. It will smoke black and haze blue If that doesn't fix it you will need to have a shop clean the carbs.
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