ok its a 2002 yz 125,fmf full exasht, and wisco piston. about 70mph?? if not corecct me. ok and i want it to go about 73. what sprockets sizes(front and back)should i use but i still want a good holeshot.
http://ttr125.net/ will allow you to purchase a sproket upgrade kit, go 1 tooth down on trans and up on wheel end. but why you want to do this for 3 mph is beyond me.