i have owned a 99 blaster for a few months now and when i ride it in the summer it fouls my plug like every ride almost but it takes a while. i dont kno if it needs rejetted or a smaller main jet. i am running regular gas im goin to start usuing premium. i thought the guy said it was a keihin carb but it has trenga racing on the side wit stickers. and when i start using premium do i have to change the oil gas ratio? i run 32:1. somebody help please.