hey guys my wr426 has been refusing to idle as of late , i cleaned the carb and that fixed the problem for a little bit, but after a short ride the bike again refused to idle . i then was able to get the bike to idle by adjusting the fuel screw on the bottom of the carb, the problem was that every time i would ride the bike and pull in the clutch to stop the idle would be bad and the bike would die unless i turned the screw to make the mixture richer. every time that i stop i have to increase the richness of the fuel. finally i stopped and looked at the fuel mixture screw. i noticed that as the engine vibrated that the screw would turn and make the mixture more lean and that was why my bike refused to idle. does anyone have a fix for this?