if youre going to run those 18s still then i highly reccomend a 14t front sprocket. and as posted before, porting, milling the head, maybe bore it with wiseco prolite piston, better exhaust, bigger carb, better suspension... stock blaster suspension sucks balls. upgrade and you will do better. i am running 18s and with stock gearing, i was doing alot of revving and not as much going. just that one size bigger sprocket, it goes way faster. not much but its deffinately noticeable. i just sent my top end to ken o connor so he is going to port it and re design my head. i cant wait to get it back