UPDATE : Boyesen is in the process of a website upgrade. Until our new store is up and operating, please use a local dealer or
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Boyesen Engineering

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Performed as advertised, I felt it was much more worth the $$ vs. the Power Now." - Eric in CO

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.

Available for all Keihin FCR carbureted MX, Off-road and ATV models. This patented 3rd generation Quickshot combines an innovative triple effect to; completely fill the pump chamber with fuel, eliminate all trapped air from the system and provide and adjustable leak jet circuit for quick hand tuning. Together with with the Boyesen unconditional guarantee, the QS3 simply delivers unmatched results.

  • Eliminates hesitation and bogging
  • Provides instant response to throttle movements
  • Reduces hot engine stalling
  • Improves low end performance
  • Bolt-on product that requires no modification
"Best Bang for the Buck - No more hot stalling, the bike feels like it just pulls twice as hard through every gear and a big difference at the dunes. Bike felt like it ran harder and stronger never felt like it ran out of power - LOVE IT!!! - Paul in MI

I have a CRF150R and it had a DANGEROUS bog when cracking the throttle open.....It made my bike run amazingly better, and more importantly SAFER! - Thanks, Skip


"Outstanding, Best product ever purchased. Most bang 4 the buck!!!!!" - PWR in VA

"Very Good Improvement - this is an awesome add on, made huge difference in bottom end in tight tree areas!"

- Jeremy in NV "A Must - All of my 4-Strokes benefited from this. A little snappier down low and less or no bog." - Eric in MA

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