This Keihin PWK 40mm Air Striker Carburetor is a direct replacement for your KX250 CR500 KX500 Quadzilla 500 500R. It has a #160 main jet and #55 pilot jet, with an OD air filter-side of 63mm and OD cylinder-side of 46mm. The length of the carburetor is 91mm and it is made of metal material with a silver finish. This carburetor is manufactured by Sudco and has a brand name of PWK40. It is a type of carburetor that is suitable for your motorcycle and scooter parts and accessories needs.