Boyesen QuickStart

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Rating 4.75 of 5 (4 Reviews)

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Product Information

Boyesen QuickStart

  • 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 carburetors
  • Simple bolt-on
  • Item # 21745
  • SKU #
  • Mfr. Part #

FitmentView All

Honda Models

  • CRF150R : 2007–2010, 2012–2017
  • CRF150R Expert : 2007–2009, 2012–2017
  • CRF150X : 2011
  • CRF250R : 2004–2009
  • CRF250X : 2004–2009, 2012–2013, 2015–2017
  • CRF450R : 2002–2008
  • CRF450X : 2005–2010, 2012–2017

Kawasaki Models

  • KLX450R : 2008–2009
  • KX250F : 2004–2010
  • KX250F Monster Energy : 2009
  • KX450F : 2006–2008

KTM Models

  • 250 SX-F : 2005–2010
  • 450 SX-F : 2008–2012
  • 450 XC-F : 2008–2009
  • 505 SX-F : 2007–2008
  • 505 XC-F : 2008–2009

Suzuki Models

  • DR-Z400E : 2000–2007
  • RM-Z250 : 2004–2009
  • RM-Z450 : 2005–2007
  • RM-Z450 Carmichael Rep. : 2007

Yamaha Models

  • WR250F : 2001–2009, 2011–2013
  • WR400F : 1998–2000
  • WR426F : 2001–2002
  • WR450F : 2003–2009, 2011
  • YZ250F : 2001–2013
  • YZ250F Anniv. : 2006
  • YZ400F : 1998–1999
  • YZ426F : 2000–2002
  • YZ450F : 2003–2009
  • YZ450F Anniv. : 2006

Product Reviews 1 - 4 of 4

Overall Rating: 4.75 of 5

(4 Reviews)
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What Other Riders Are Saying...

Fit

Quality

Installation

Recommend

Quickest throttle

We are using the Boysen Quickstart in two of our race bikes and the difference in throttle response is impressive. One of these engines is stock, and one is a highly modified 490cc. Both set-ups have responded well to this mod and hot engine starting at the entry gate is much improved. Highly recommend this to all.

Mark - August 18, 2015

(Pleasant Hill, CA)

Fit

Quality

Installation

Recommend

ONE STEP TOWARD FUEL INJECTION!!!!

I just recently put this on my 07 KX 450. It was a little tricky to figure out, the directions weren't very descriptive. All in all this is a part I highly recommend. My bikes throttle response is lightning fast, no more hesitation to hit the powerband. It even has more torque now. The starting problem solved, no more kicking for hours trying to get it back running cold or hot.

Austin - March 10, 2011

(La Conner, WA)

Fit

Quality

Installation

Recommend

Bought it...Love it!

Bought it, put it on and man what a difference. My YZ450F get up and hauls. Faster acceleration, no bogging, starts smoothly when hot. No more kicking for days to get it started. Excellent product for a quick fix to the dreaded 4-stroke starting problems! Price is good too. Heck, I'd have easily paid a Grand for an electric start, if it was available LOL...Service from MS was correct and on time delivery was just as advertized. Go get one and fix your start problem. Only takes about an hour, even for a new mechanic. Heck the hardest part was getting the carb off the bike to start the install of the QS. Just pay attention to the instructions, and make sure you highlight the finer details of setting it up.

William Bauer - November 27, 2009

(Hazel Green, AL)

Fit

Quality

Installation

Recommend

Quick start

I bought the quick start to help those dreaded hot engine starts. It helped the throttle response and fit perfect. It helped the hot stall starting quite a bit. It definitely requires a new technique to learn. Good stuff!!

Eric - October 6, 2009

(Eureka, CA)