ok just started having problems with my blaster now, worked fine before.. so what started to happen was it would bog down and backfire at full throttle around high 5th through 6th gear(again only at high rpms), so i thought maybe its the reed spacer or the carb is plugged. well i removed the spacer and the carb was fine so i put carb back on and still did the same thing(i also checked reeds). so me and my dad started messing with the air screw or whatever that is on the side of the left side of the carb by the air filter hose. we set it too i think 1 instead of 1 1/2 turns and it ran perfect better then before. so the next day i go to ride and it starts to act up again so idk i'm out of ideas. i almost think the needle needs to be lowered or raised or maybe the jet needs to be smaller or larger. i have a 310 jet in their now so maybe there is too much air and not enough fuel but the 310 worked fine before but idk i need ideas