new 04 wr450 problems

5 replies to this topic
  • osborne

Posted March 04, 2007 - 07:06 PM


Howdy, I just got a 2004 wr450. 150 actual miles looks showroom new. The guy had the throttle stop done and baffle pulled. Went for my first ride in the mud. Has a bad dead spot when you wick up the throttle. Put race fuel in it thinking it may be gumed up. took out the snorkle. then rode it with the air box cover off and seat off. better than it was but ran better with the choke on. I went 3 1/2 turns out on the fuel screw and it still has a miss. better than it was but not good. Help me out with what to do next. What should I try with the jets, how far out on the fuel screw? etc....
Thanks for any help.

  • clark4131

Posted March 04, 2007 - 07:16 PM


You have the stickies...SC

  • KickInTex

Posted March 04, 2007 - 07:21 PM


Sounds like the carb has gummed up or has gotten some debris in it. Also, this model is jetted extremely lean from the factory, and is only made worse when the air intake is opened up by removing the baffel. If the grey wire on the ignition circuit is also cut, things get even worse still. I have an 04 and an 07 model WR450F, and both of them from the factory were dismal at best out of the box. They both came 165 main jets. I have put in the JD Jetting kits in both bikes and performed all the free mods(grey wire, baffel, throttle stop. With the JD jetting, the bikes both use 170 mains, which is five steps above the stock baseline setting. Both bike rip and run perfectly with absolutly no problems. I have had the 04 for about 2 years and did these mods soon after I got it. I liked it so well, that I gave it to my son, and got me an 07.
I would try getting me a jet kit, pulling the carb off and cleaning it, and installing the kit. It comes with easy instructions. Good luck.

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  • trailordune

Posted March 04, 2007 - 09:07 PM


check the jetting, properly re-jet and don't ignore the leak jet on these bikes.

  • Fullbore4

Posted March 04, 2007 - 11:44 PM


Do the Red Beard mod and use a 70-90 leak jet.

get this pdf file.

http://www.thumperta...t=red beard pdf

  • osborne

Posted March 05, 2007 - 07:28 AM


thanks for the input. I figured it would need re-jetted. I've read the stickies, what has worked for you guys on the airbox mod?


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