mikuni carb set up


7 replies to this topic
  • BIG RED

Posted July 27, 2005 - 06:34 PM

#1

My new mikuni pumper will be here any day and i heard they are hard to jet if anyone has one and may be able to steer me in the right direction as far as jets that would be great! i have an 03 xr650r with a white bros heater and E series S bend can. the intake boot is opened up but am still running stock air cleaner and screen i live at sea level and do most of my riding between there and 2000 feet. i;m just hoping to be able to order jets that are close so i can ride the bike right away. I have no idea what jets will come with the carb but i am sure they will be way off
Thanx

  • BWB63

Posted July 27, 2005 - 06:49 PM

#2

The bottom and top jetting is easy. It will be about 20.0, 22.5 or 25 for the pilot. The main will be 137.5 maybe a 140 the hard part is they leave the Harley air jet in some of them .09 or 1.0 and the XR650R runs better with a 1.2 air jet. I found that a Y-4 needle jet and a 9dhj-1 (this might be the wrong number I'll have to look) needle worked best middle clip

http://xr650r.borynack.com/

Some mikuni stuff at the bottom of this page

http://www.borynack....sePowerMods.htm

  • BIG RED

Posted July 27, 2005 - 09:03 PM

#3

Is this info for the 680? i am planing on keeping the pig a 650 until i blow her up. i will order these parts tomorrow if they don't have them in stock. thanx alot this will save me a lot of guessing and i can get rite to the fine tuning.

  • dblhaulclimbing

Posted August 30, 2005 - 08:07 AM

#4

hey, I have a 2002 XR650R with a TM 40 carb and I am trying to figure out jetting. I live at 7700 feet in Colorado. I have the stock exhaust with power up tip. I have a K&N filter and opened up air box. Any help would be much appreciated. I am going to get the air jet in it soon.

Thanks, Morgan

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  • BWB63

Posted August 30, 2005 - 02:47 PM

#5

No the jetting is for a stock XR650R but, leaner for your application. A place to get close so, you can zero in on tuning it right.

  • BWB63

Posted August 30, 2005 - 02:49 PM

#6

hey, I have a 2002 XR650R with a TM 40 carb and I am trying to figure out jetting. I live at 7700 feet in Colorado. I have the stock exhaust with power up tip. I have a K&N filter and opened up air box. Any help would be much appreciated. I am going to get the air jet in it soon.

Thanks, Morgan


20 Pilot should be close but, 22.5 might be better with a 1.2 air jet. Y-4 needle jet. What needle do you have? 135 main.

  • dblhaulclimbing

Posted September 01, 2005 - 08:09 AM

#7

I have the 9DJY4-98 needle. I haven't checked the needle jet but it is the one that comes with it. I have a 1.3 air jet and a 20 main. I actually got it running pretty well last night but I had to retard the timing of the accelerator pump to get it right. Any help with the pump would me much appreciated. Thanks, Morgan

  • BWB63

Posted September 01, 2005 - 02:28 PM

#8

I ran the pilot a little ritch and the pump late.





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