yz426/boyesen accelerator pump cover

2 replies to this topic
  • probikerguy2

Posted July 20, 2005 - 01:04 PM


i just bought a used yz426f and i love it. suspension is awsome for trail riding and it handles well the only compliant i have about the bike is the notoriious low end flat spot in the powerband that i have heard most early 426's have. The bike runs fine otherwise. i work on bikes so i have tried tuning the carb a bit which has helped a bit but there still is that little hesitation in the powerband. i saw an advertisment for a Boysen accelerator pump cover that is is supposed to help the low end bog. But my first qustion is that is this pump cover really work? if anyone has used this upgrade any info will be appreciated. thanx

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted July 20, 2005 - 01:09 PM


Before you spend $90 on the Boyesen gizmo, try The BK Mod

  • 642MX

Posted July 20, 2005 - 04:26 PM


Yes, I've got one.
Yes, It works just like advertised.

I've got two rides under my belt with it and I think it increases the throttle response time significantly. I don't think you'll be disappointed. :applause:

Related Content


Wilson the Blue Privateer by jetfuel

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  50 replies

Megabomb Fitment by 288yz450

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017

Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride

Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies

Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.