Join Date: Jun 2009
Location: Champlain Valley
Stumble/Misfires 6K-8K Can't Find Source
Greetings! I'm on my 2nd EX250, a basement find that had been idle for 15 years, and I'm stumped on how to deal with a bad stumble from 6K to 8K.
unipod filter in unmodified airbox
stock jets, 1 washer shim, air/fuel screws dialed out 3.25 turns
swapped out four coils & two CDIs, mix and match did not make a difference - all second hand parts
Bike idles fine, have made adjustments and tweaks to idle, no difference. Up to 5K revs fine, if I never had to break 40mph I would not even notice. Over 8K the bike pulls fine again to 11K, which is as high as I dared go.
Carbs were a brick when I got the bike. They have been rebuilt twice and in and out four times.
No apparent damaged to wiring. All other electrical works fine.