you want top speed?... sprokets smaller in the rear larger in the front ..... your comprtession youll have to get a piston... and remeber if you go above 11.1 then you'll have to run race gas which isn't cheap....and yes they do make n.o.s. kits for quads..lol.. but if you want one then your taking your compression the wrongf way you want to go down if you gte nos..
you might want to think about a cam for you engine or maybe a carb..let me know if you have anyt further ?'s
06 YFZ 450..all white... LRD pipe, jet kit, lid removed, cam mod
LT JB front end and Ohlins shocks coming before june.