jetting question for 09 yz450f

5 replies to this topic
  • yzf1999

Posted February 21, 2011 - 04:47 PM


Hi guys.. could someone please advise me. I put a fmf 4.1 slipon on my new 09 yz450f. Am i gonna need to change the main and needle clip position? I was thinking of using the 165 main that came in the bag of goodies, also moving the clip one position to the 4th position...any real world advise would be helpful..thanks.

  • downin

Posted February 21, 2011 - 04:58 PM


I put an powercore 4 slipon and a twinair filter on my 09 and didnt have to touch the carb.

  • grayracer513

Posted February 21, 2011 - 05:17 PM


Look through this:


Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • yzf1999

Posted February 21, 2011 - 05:33 PM


i couldnt get it to show the posts

  • grayracer513

Posted February 21, 2011 - 06:16 PM


When I click the link it takes me to post #6, and I can scroll up and down. Anyone else have a problem with that?

If you can't get it to work for you for some reason, try this:

It's the '08-'09 page of the jetting sticky on the index page.

  • yzf1999

Posted February 21, 2011 - 06:22 PM


i got it...thanks

Related Content


Michigan Motocross Tires by 288yz450

Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

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

YZ450F 03 Sparks driving me crazy by SirAttard

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

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F

Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 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.