Rough Idel at steady RPM

5 replies to this topic

Posted August 13, 2005 - 06:39 AM


On my 03 WR450 It runs really good in the woods but when I hit a road and keep it at a steady RPM it has a VERY sluggish rough idle.
I know it is jetting but what could I do.
I have factory exhaust with a Twin Air Filter(usual air box mods) thats all

  • wrkaholic

Posted August 13, 2005 - 08:52 AM


Try tightening the fuel screw 1/2 turn.

  • Dirt_rebel

Posted August 13, 2005 - 05:25 PM


u can try disconnect the throttle positioning sensor (tps) for road use.. it helps.. it'll give u a steady firing n u'll feel alot of difference..cheers

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  • dman450f

Posted August 14, 2005 - 06:13 AM


I too had that problem,after doing all the free mods ,the jd jet kit red neddle at number 4 position and 168 main at my elevation ,fuel screw out 1 3/4 turns and the bike runs sweet!try the jet kit! see ya....

  • chipwich

Posted August 14, 2005 - 09:31 AM


Search for TPS in this forum.

  • SpeedBlitz

Posted August 15, 2005 - 03:59 AM


In addition to chipwich's suggestion, search for "stutter", "surge". I found a good post by yamaharichey in the Jetting forum. I'm running a setup very close to what he suggested and I like it a lot. No stutter or hesitation.



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