Results 1 to 2 of 2

Thread: 400 ex jetting

  1. 03-09-2005, 04:00 PM #1
    rsimmons_82
    rsimmons_82 is offline Member
    Join Date
    Mar 2005
    Posts
    54

    400 ex jetting

    ive got a brand new 400ex (2004). Since i bought this brand new, im a little stapped for money and cant really afford a pipe at the time. i cant stand it being so quiet, so i decided to cut out the silencer and i reinstalled the spark arrester to make the park ragers happy. I also removed the airbox cover to bring in more air to the stock filter. my question is "do i need to rejet the stock carberator, how do i know if it needs rejetted, and will i damage anything by not rejetting it?

    like i said, its all stock with the exeption of the removal of the silencer and airbox lid being removed. oh yeah, im about 1800 ft above sea level.

    if anybody know what size i know or how i find out what size jets to get let me know.

    rsimmons
    Reply With Quote Reply With Quote
  2. 03-09-2005, 04:10 PM #2
    cals400ex
    cals400ex is offline Registered User
    Join Date
    Aug 2002
    Location
    Staunton, Illinois
    Posts
    7,259
    i would start with a keihin 152 mainjet. you may want to put in a 42 pilot jet or at least turn the fuel screw out a little bit.
    2005 450r

    *sold* 2001 400ex

    "If you think you can, you can. If you think you can't, your right."

    "A leader will take you where you want to go. A great leader will not necessarily take you where you want to go but where you ought to be."

    "If you want to do something, you will find a way; if you don't, you'll find and excuse!"

    "Its not aptitude but attitude that determines your altitude."
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules