Hello all, just wondering where to buy sprockets. Looking for a -1,+3 so i can still use stock chain. If any experience, what does this do to gas mileage? So far ive been riding for about 2 months(with 10 years of dirtbike and atv exp) and im clutchin 2nd(40),and 3rd(65) and i just want to make it easier..its not hard just see all reviews and decided thats the way i want to do it. Thanks guys in advance! Also my bike is an 02 does anyone know what tooth count the front and back are?