Get instant response to throttle movements and improved low-end performance! With more than 30 years in High Performance engineering and manufacturing, Boyesen has produced an all new accelerator pump cover to solve the bogging problem associated with 4-stroke Keihin FCR carburetors. The QuickShot 2 will fit all FCR Keihin carburetors. The 2007 Honda CRF model houses a high volume check valve that manages fuel through a cartridge design for high sensitivity and instant acceleration.