Image Bye-bye carb, hello Yamaha fuel injection. The 450F uses a 44mm Keihin throttle body. Use keyboard arrow keys to browse the gallery. Swipe to browse the gallery. Prev Next 28 of 51Autoplay Autoplay SlowMedFast Share to Facebook Facebook Facebook Share to Twitter Twitter Twitter GuyB 9/8/2009 7:54am Share to Facebook Facebook Facebook Share to Twitter Twitter Twitter