i have an 06 and i shaved the head and advance the time 6 degrees and it ran great. after about 6 hours the left cyclnder stoped fireing. so i changed spark plugs cleaned carbs swaped plug wires checked all elec. connections reeds look good. but whats weird is the cyclnder will die then start up then die and so on. it also will miss and pop out of that side. mods are t3's k&n's outerwears, shaved head adjt. timming plate. any help please.going to glamis for thanksgiving need it to be running cherry thanks