Jet Kit for 2005 Yamaha YZ450FTake your performance to new heights with a Carburetor Jet Kit for your dirt bike. Increase power and improve performance throughout the entire RPM range while improving throttle response and smoothness. These Carburetor Jet Kits take the guesswork out of tuning your dirt bike. Whether youre rolling with a stock dirt bike or youve made some modifications our Jet Kit will optimize your air fuel ratio to eliminate rough spots and help you take control