When ripping through the gears I have good power in 1st gear but as I shift through the gears is as if its running on one cylinder, it basically falls on its face. Carbs have been apart and cleaned and everything is jetted correctly and the carbs are synched. Now with this same setup quad ran great, no complaints good power no sputtering good throttle response, just all of a sudden it started this problem. Drained the gas, added new, tested the coil it tests ok .28-.38 ohms its within spec. Air filter is clean. The left cylinder spark plug is darker then the right so it leads to beleive that that cylinder is fouling out under WOT? Ive had this thing apart so many times im losing my mind and am supposed to ride this weekend...any suggestions?
Its a 96, FMF fattys and turbine cores, timing key, tors eliminator.