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90 bayou 220 misses and wont idle good

9417 Views 12 Replies 5 Participants Last post by  dieselburner
i have a 1990 bayou 220 that will not idle. When it gets warmed up real good it will idle, but very poorly. the idle is up and down. i have cleaned and rebuilt the carb. I have adjusted the pilot air screw to 2 1/2 turns out.(the kawasaki mechanic told me that was the best). the clip on the needle is in the second position from the bottom. the air filter is new. the only way i can keep this machine running is to increase the idle screw, but then it is way to high. The machine feels like it is missing when the idle is high. The bike runs great at 1/4 to Full throttle.
could The CDI cause this? I have tested the CDI with an OHM meter. In the Clymer repair manual there is a chart for what the reading should be. If i tested the cdi correctly, values in the manual dont match mine. the dealer wasnt much help with this.
The exhaust valve clearance seems to be with in specs. I could not check the intake valves clearance though.
does anyone have any ideas??????
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Thanks for the reply! I have replaced all the jets and needles. i used a Moose rebuild kit. I basicly stripped all the parts out down to the shell of the carb. Is there something more i should have done?
I was leaning towards the CDI. I just didnt want to spend that much money if it wasnt going to be the fix. The bike sure acts like the timing is off. at half - full throttle the bike seems ok. My problem is just at idle. I have checked the timing chain. The indicator mark on the sprocket lined up with the mark on the head, the flywheel isnt exactly lined with the hole on the case. i have not messed with the timing chain at all. can these boxes be repaired? or should i just buy a new/used one?
the timing marks are right. when looking at them from different angles it appeared to be off a little. I checked my intake valve clearance this weekend and it was at .015mm . the book says .015 - .020mm. i talked the the mechanics at kawasaki shop here in town. he told me to adjust to the .020mm, also got some carb dip. have the carb soaking in it know. the mechanic doesnt think it is the cdi. he thinks its valve clearance and dirty carb. They told me that if the cdi was bad the bike wouldnt run. i doubt that anything i did this weekend will make a difference. the valves were within spec and the carb didnt appear to be clogged. :frown:
if this doesnt work i think i will just replace the cdi.

Thanks for the reply! The spark plug gap was a little off, but still within spec. regapped to the middle range in book. the pulsar coil is brand new. the kawasaki mechanic told me to close up the gap on the coil. he said the bayou's run better with the coil a little closer to the flywheel. theres not much else it could be. i am getting a great spark, compression will rip your arm of if you try to pull start it. the top end is faster than my 2000 bayou. this is a great little atv, it just a some gremlin:p
Thanks Man!!!!

I will try that and let you know!
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