run a 17 tooth front and a 37 tooth rear, that will give you a little more and wont hurt your cash flow.. if you want to go bigger than that start looking at IRK's, hc pistons, racing cams etc...
just baught a new pit bike. How can i find out if my stock sprocket is a 420 or a 428 because i want to purchase a smaller back sprocket, and bigger front but dont know what to go for... if anyone knows how to find out please help!!!