Did you follow the plugchop directions exactly, warmed up bike with old plugs, stopped and put in new ones. Then took it through the gears wide open, then pulled clutch & killed motor simultaniuosly without letting out on clutch till completely stopped? You need to be checking the porcolen at the base, if you do a plugchop then you can really tell. By base I mean up at the top of the threads where you can't hardly see wiyhout chopping. You may not be as lean as you think.