My friend has a 87' 250r that is completly stock other than a K@N filter w/ no airbox and a boysen rad valve. We have taken the carb apart and cleaned it and tried adjusting it. It stopped idling after he put the filter on. Anyone have any ideas on what to try.

-chuck

 

Did he rejet it?

 

we re jetted the main jet but I don't think that has anything to do with the idling.

-chuck

 

Try adjusting the air screw mixture, If your pilot is pretty close it should be 1 3/4 turns out. I run a 48 pilot at 2500ft.

 

sometimes the filter are to oily. have you put in new plug/checked plug?

 

fire the bike up and keep it running with the throttle, just enough to keep it running, while doing this, you or better yet, have a freind spray carb cleaner around all the intake boots to the carbs, if it rev's up on it's own, it's got a air leak, this will cause it not to idle also.....worth a shot, it's cheap.

 

Mine did the same thing and mine was the pilot jest was to lean i richened it up and know it idles fine give that a try and see if it works.

 

Yeap, it's the pilot!

 

Coil wire could be bad too