2001 yz426 bog off idle

4 replies to this topic
  • briangriff321

Posted December 02, 2011 - 08:07 AM


On my pops 426 its got that bog off idle when you hammer down on it....how do you fix it...is it a jetting issue? Lean maybe?

  • grayracer513

Posted December 02, 2011 - 09:09 AM


First, you need to learn how to "roll" the throttle open, rather than snapping it like so many do on a two stroke. You shouldn't have to open it slowly, just smoothly, allowing the engine an opportunity to catch up. It should be reasonably responsive, but it won't ever tolerate the throttle being busted wide open from an idle unless you want to sacrifice the rest of its performance for that capability.

If it is not reasonably responsive, try adjusting the accelerator pump timing per the manual first, and if that still doesn't clear things up, try the BK Mod:


Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • briangriff321

Posted December 02, 2011 - 09:20 AM


Thanks for the info

  • Schpenxel

Posted December 02, 2011 - 10:29 AM


BK Mod helped mine quite a bit--give that a try as has been suggested.

  • CRF100biker

Posted December 03, 2011 - 06:20 PM


question, is this on the stand or while riding? bikes behave differently under load.

Related Content


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

Megabomb Fitment by 288yz450

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

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies

BIGBORE FOR YZ450F 2006? by Taattie94

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 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.