i have a stage 6 MK2 with stage 6 sport exhaust , 17.5mm carb , had a 80 jet in with sport filter and ran shit and wouldnt pass 30mph , so put a 93 in and still ran shit so put original airbox on with sponge folded and holes in the air box and ran better but stuttered and felt like someone was pulling me back after i got to 45mph , and took a while to pick up to this speed but was better than the 80. today i tried a 110 main jet and is even worse and runs shit and will only do around 15mph on flat and the spark plug was black. downhill it would do around 40mph and then start stuttering. my mixture screw was open 4 turns so closed it to 2 1/2 but still no different. i have a 21mm carb with a 92 jet in it so i might try that but want to know first what size jet i should try on the 17.5mm carb any ideas??? cheers
