Boysen Accel Pump mod??

5 replies to this topic
  • Decreasing Dave

Posted January 27, 2006 - 04:15 AM


Do I need this on a my '06 YZ450??

I haven't seen anything posted on it here.


  • lipskid

Posted January 27, 2006 - 06:00 AM


Mine has excellent throttle response, no bog anywhere. If it did I think I would try jetting first. Fixed it with a smaller leak jet on the WR. Way cheaper. JMO

  • mtrdrms

Posted January 27, 2006 - 06:33 AM


It helped incredibly on my 250. I couldnt see getting any better throttle response out of my 450. I did however jet the 450. 170 main, 48pilot.

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  • Beanb1

Posted January 27, 2006 - 07:00 AM


If I remember correctly, the 06 450F comes with a 45 leak jet, which is about where you want it to be based on past experience (40). I was going to put my boysen pump on also, but have been more than happy with the acceleration. I haven't notice a bog yet.

  • Ga426owner

Posted January 27, 2006 - 01:52 PM


Someone posted a mod to the Accelerator pump adjuster with wiretie - :thumbsup:
this would do the same - anyone have this info to post?



Posted January 27, 2006 - 01:57 PM


If your bike has a bog or hesitation anywhere, you will love it.

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