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

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