This is a top quality Hi-Caliber Powersports Parts carburetor rebuild kit with precision machined components for the 2000-2012 Yamaha YFM 400 Big Bear. Don't waste your time rebuilding your old carb with cheap quality, inferior parts. Rebuild it right the first time with this quality kit and get your old atv screaming again. The kit includes all gaskets, o-rings, springs, main jet, slow jet, float needle etc for a complete carburetor rebuild as shown in the photo above.