2007 YZ450F Jetting...

1 reply to this topic
  • jbehunin

Posted December 18, 2007 - 05:52 AM


I am from Utah where the average altitude is about 4500 feet. I am going to be riding the desert of Southern California over the new years weekend out at the tracks.
I currently have a NFLR needle jet with the clip in the middle position, 45 primary and a 062 main, and the air mix screw at 2 1/2 turns out....
will this set up work out in California?

I have never ridden a 4 stroke out in california before, so I need to know...

Thanks for your time.......

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

Posted December 18, 2007 - 07:09 AM


The pilot is probably OK, but you'll probably want to go to a 165-168 main jet for the drop in altitude. In the warmer months, it wouldn't matter that much because the higher temperatures would compensate for the altitude to some extent, but this time of year, I'd guess that would be a little lean.

Related Content


YZ450F 03 Sparks driving me crazy by SirAttard

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

Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

yz400f throttle bog by yz400fmaniac

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • * * * * *
  • Hot  28 replies

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 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.