1/4 throttle blues

9 replies to this topic
  • pman1

Posted November 09, 2003 - 01:06 PM


Does any one have problem with 03 wr 450 at 1/4 throttle? Mine runs very rough. tried moving clip up and down. Each way makes it worse. Changed pilot jet each way. Each way is worse. Also I never recieved anything about a recall from my dealer. Does it only affect sertain serial no.s or is my dealer letting me down. Please Help!!!!!!!!!!!!

  • Jim_bo

Posted November 09, 2003 - 04:29 PM


I had a problem with mine surging at 1/4 throttle. I got a YZ450 needle for my carb and it fixed it right up.


  • racemile

Posted November 10, 2003 - 10:32 AM


I know that on the 426, that area of the throttle was controlled by the pilot circuit....is this different on the 450's?


  • WR450F_RDR

Posted November 10, 2003 - 02:29 PM


If you havent tried the James Dean needle kit that is what I would suggest, overall this made the most improvement in low end response on my bike.

  • lipskid

Posted November 10, 2003 - 02:51 PM


Pman- Mine was the same, grey wire mod fixed it.

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  • Jim_bo

Posted November 10, 2003 - 03:19 PM


I tried the YZ needle because it is a richer needle than the WR. Mine surged a lot at about 1/4-1/3 throttle. I took it up to the mountains (about 7000 ft) and the problem went away. I then knew I had to richen up. Worked for me and it was only about $10 and 15 minutes to install.


  • Indy_WR450

Posted November 10, 2003 - 04:24 PM


JD kit is worth every Penny for a WR! Best needles around.

  • pman1

Posted November 11, 2003 - 07:21 AM


thanks everyone. Will try needle and cut grey wire. If
That doesnt work will get JD kit.


  • WRer

Posted November 11, 2003 - 06:54 PM


I have the same problem with the WR450 is there a dead spot when you crack the thottle quickly also

  • pman1

Posted November 12, 2003 - 09:33 PM


no dead spot just doesnt run smooth at about 1/4 throttle


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