Boyesen QuickStart - Hot engine kick-starting is no longer a problem. Available for ALL Keihin FCR-equipped MX, off-road and ATV models. The patented performance of the proven Boyesen QuickShot system, now with adjustable leak jet and hot start assist integration! A serious step towards achieving EFI levels of performance. Try the most effective way to add performance to your Keihin FCR carburetor. Integrated Hot Start Assist eliminates problem 4-stroke hot start procedure. Tunable leak jet maximizes volume of fuel and duration of fuel spray for all conditions. 25% more fuel capacity. High-volume vertical check valve located in the QS3 for precise, consistent fuel metering. Patented design stops bogging and improves throttle response. Improved low-end performance. Investment-cast and finished to precise tolerances. Fits ALL Keihin FCR carbs.