'01 YZ426f Elevation Jetting


1 reply to this topic
  • fmx09

Posted August 24, 2015 - 04:06 PM

#1

I have an 2001 YZ426f and live in San Diego. I ride mostly in the surrounding desert so nothing ever above 2000 ft elevation. I am taking a hunting trip in a few weeks in the mountains of Idaho and am planning on using my dirt bike for transportation. Do I have to change the jetting for it to run up there? Will be between 7500-10000 ft. I don't mind if it runs a little funny as long as it runs. I just need it to get around up there. Thanks in advance.



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

Posted August 25, 2015 - 05:44 AM

#2

Based on rule of thumb calculations, an 8000 foot increase in altitude calls for a reduction in jet size of about 7% (slightly less than 1% per thousand feet), so by that, you'd need to go from, let's say a 170 to a 158-160 on the main, and from a hypothetical 42 pilot to a 39-40.







Related Content

Reviews

Yamaha YZ450F 2017 by Chris.GVS


Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews
Forums
Photo

2016 YZ450 by CaptainKnobby


Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
Forums
Photo

Snake pit oct 30th by The Anvil


Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies
Wiki
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info


Articles
  • 0 replies
Forums
Photo

James Stewart back on a YZ450F by YamaLink


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies
 
x

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.