jetting for a '00 YZ426F w/ Power Core 4


1 reply to this topic
  • 09KLX250

Posted October 22, 2009 - 05:20 PM

#1

I just put an FMF Power Core 4 with Power Bomb header on my other wise stock '00 YZ426f and was hoping someone with the same set up could point me in the right direction on jetting. The bike runs good, loud but good, but I'm sure I'll need to rejet. Normal temp for a ride( dualsport street riding ) is about 116 degrees. A ride this afternoon and the bike ran 135-140. Hotter temp to me would mean lean condition but do I jet pilot or main? Slight surging at steady 45 mph( 14/49 gears ). Any help would be appreciated.

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

Posted October 22, 2009 - 07:00 PM

#2

Hotter temp to me would mean lean condition

Not necessarily.

http://www.thumperta...ad.php?t=694921

http://www.thumperta...699#post2881699

http://www.thumperta...ad.php?t=327405





Related Content

Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
Forums
Photo

2016 YZ450 by CaptainKnobby


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

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies
Wiki
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info


Articles
  • 0 replies
Forums
Photo

First Hare scramble tips by dhend8


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