One place to find all WR free mods?

7 replies to this topic
  • tcmII

Posted January 29, 2004 - 01:31 PM


Ok! After a little study, I bought a used 1998 WR400 for a good price.

I have found a number of threads and articles on "free mods." Rather than going through searchs for each, is there one place that identifies what and how for the mods. As far as I can tell the "free mods" are: Grey wire, air cleaner cover, throttle stop, light blue wire, YZ cam timing and exhaust baffle. Did I miss any?

By the way does anyone have any experence with the GYT-R baffle? Seems like a cheap alternative to expensive exhaust.

Lastly, when I make all of these changes do I need to re-jet. I can handle everything else, but have always been a idiot when it comes to carb adjustments (other than stock).

Thanks now for what I'm sure will be a lot of grief, I mean help, from all of you!

  • motomadman

Posted January 29, 2004 - 01:44 PM


Here's a GOOD reference WR400 Modifications

  • jchantzWR400F

Posted January 29, 2004 - 01:54 PM


There is no doubt that you will have to rejet.

  • tcmII

Posted January 29, 2004 - 03:03 PM


Thanks, I found that one early in my search but it's nice to know I'm looking in the right places.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • F6dood

Posted January 29, 2004 - 03:47 PM


Here's a GOOD reference WR400 Modifications

Is there a site for the 2002 WR426 ??
I am interested in the dyno numbers for that machine.

  • motomadman

Posted January 30, 2004 - 10:31 AM


Can you post your findings?

I am in the same boat, have a '99 WR400 that is totally stock and in need of some performance gains.


  • Taewa

Posted January 30, 2004 - 12:15 PM


I found this one, but it is specifically for the wr450. I am wondering if I can use these directions (and if it all applies to my 99 WR400). Anybody know on this:

  • wrooster

Posted February 01, 2004 - 09:39 AM


while it is written for the 250F's, the 250F FAQ contains a lot of information which is also immediately applicable to the WR400/426/450.

or use this handy index page to navigate:

for example, there is an excellent page on jetting which will help you understand what's what on the FCR carb:

and, the FREE MODS page covers everything you wanted to know about the airbox, gray wire, etc.:

jim aka the wrooster
'01 wr250f


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.