James or Clark help if you would (Jetting question)

3 replies to this topic
  • Kermit

Posted October 19, 2000 - 07:24 PM


First off my bike is TOTALLY stock '00 WR. I live at I beleive, 2200 ft. ride from there to about 5-6000 and up. I just rejetted from the stock jets PJ #42 and a MJ #165 stock to a PJ #45 and a MJ #170, needle at 4th clip from the bottom. Fuel screw out 1.5 turns.Brand new plug, CR9E The bike loves mid range and WOT. It spits and sputters at 1/4 throttle. Everything is sparkalie clean. I duel sport it so I am at 1/4 throttle A LOT. The bike runs great when I am on and off the gas when I hit the dirt or racing the engine. BUT I can't race it down the road the cops don't like that too much. Oh yeah it has the stock needle in it. (DRS?) Thank you very much guys,if you can help. I have read many of your post and you two seem to know your sh%t. No offense to anyone else on this site open opinions welcome.

[This message has been edited by Kermit (edited 10-19-2000).]

[This message has been edited by Kermit (edited 10-19-2000).]

  • Clark_Mason

Posted October 19, 2000 - 08:05 PM



This is most likly due to a lean condition between 1/8 to 1/4 throttle.

Try your fuel screw at 2.5 turns out and see if this clears it up or makes it better?? If it makes it better go to a 48PJ and then set the fuel screw at 1.0 turns out and test if it still stumbles noticibly then increase the fuel screw opening in 1/4 turn increments until the stumbling at steady throttle settings is tollerable.

I also have run into this situation as I ride street quite a bit. Richening the pilot circuit as suggested above should help. The stock DRS needle is fairly lean on the straight section which further agravates this situation.

Good luck


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  • James_Dean

Posted October 20, 2000 - 06:41 AM


... and also try the DRS in the standard #3 clip counted from top, with this process. We normally count clip positions from the top.

(DRS#4 is close to DVR#6, a rich clip setting)


  • Kermit

Posted October 20, 2000 - 03:21 PM


Thanks guys I'll let you know. How it goes. I haven't had a chance to rip into it yet.


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