I have a kawasaki 300 byou 1990 moled 4X4 that i put a carberator kit in but just doesn't run right spits and sputters when i give it gas it will idle ok sometimes. drained all gas and cleaned out good. its a KLF 300 4X4

is there no air filter attached

Spray it with carberator cleaner to get the gunk. You might want to put fuel injecter cleaner in the gas tank.

Faulty starter solenoid or relay possibly

Hey Dave,
thought I answered this already,,,??? Classic "brass kit" symptom! >>> You need a "brass kit".. this is the needle jet and the jet needle in the center of the carb. The jet needle is the thin needle that hangs down from the center of the slide... The needle jet is the "hole" that the jet needle slides into...Remove the carb, take the bowl off, remove the main jet, the needle jet holder should be able to be gently tapped out, the needle jet is a short brasspiece,, it comes out through the hole where the slide goes,,, reinstall the NEW needle jet, needle jet holder...(it may have a groove in it for correct location). once its seated, you can reinstall the main jet..NOW >> to install a new jet needle,,, remove the slide from the carb.. remove the spring and seat from the slide that holds the needle jet in place.. NOTE which groove the clip is in on the old needle.... (should be the middle one). re install the new needle, reinstall everything else and your atv WILL run fine for a long time..This is a common problem on ATV's..
you need part #'s
1990 Kawasaki BAYOU 300 4X4 KLF300 C2 Carburetor

http://www.kawasakipartshouse.com/oemparts/p/kawasaki/16009-1503/needle-jet-n36w

http://www.kawasakipartshouse.com/oemparts/p/kawasaki/16017-1270/jet-needle-6

This sounds like the high speed jets are slighty clogged and needs cleaned again.

catalitic converter is plugged

have it put on diagnostic more than likely a o2 sensor is goin. loosing power and reall laggy? poor gas mileage?.sensor tell the comp air to fuel mixtures in case you dont know. parts about 50 to 150 depending on the car.

Hello

I am also facing the same problem

http://consumerguideauto.howstuffworks.com/1990-to-1994-chevrolet-lumina.htm

This will help you

Thanks

Could be dirt in a fuel jet in the carb. You cap purchase a fuel cleaner to put in the gas tank and if that does not work the carb will have to be cleaned.

do a compression test