did you readjust the idle screw and air/fuel screw to manual specs? Did you write down their values before you disassembled it? You can get the manual here at http://deepa.recongamer.com . Are there any mods to the bike?
DId you use a moose or likewise carb rebuild kit, or just clean it and reassemble it? The kits are cheap, and are well worth the money for all of the jets and gaskets and such you get with it. Ive installed one on every bike that i own.
Did you clean the choke assembly/circuits inside of the carb? That can mess somehting up too
Try messing with the air/fuel and idle screws in accordance to the manual, and try a new plug, and see where it goes from there.
1986 Tri-z
1985 250r
1985 200s
1985 70[/SIZE]