This carburetor mid body kit is a lifesaver if you're rebuilding the carb on your Yamaha or similar dirt bike. It fits a range of models from 2003-2009: WR250F, WR450F, YFZ450, Honda CRF250X, CRF450X, and Kawasaki KLX450R. Includes the gaskets, seals, and components needed for the mid-section of the carb. Helps fix leaks, improve performance, or just refresh an old carb. Installation is pretty straightforward if you're familiar with carbs – though if you're not sure, having a pro handle it is a good idea. Always confirm your bike's exact year and model before buying to avoid fit issues.