ProX Racing Parts high quality carburetor rebuild kits are the easy solution to rebuilding your carburetor if your carburetor is leaking, or the fuel distribution is disturbed. ProX Racing Parts offers a kit with all components you need. The rebuild kits include the following components: All O-rings. Gaskets. O.E.M. size jets. Standard jet sizing for your bike or ATV. Needle. Mixture screw. Float bowl screws. Float valve needle and seat (where applicable).