Depending on where you live determines what stock jet you have. If you live in the south, i'm in TN, then your stock jet is a 162. If you order the kit from atvoutfitters, I got mine there, it should come with 3 oem jets. The instructions said for me to use the 170 but I ended up using the 165, the 170 was too rich, but I am at least one size bigger that stock.