XR650R fuel screw adjustment/stumble

4 replies to this topic
  • Guest_Guest_*

Posted February 11, 2003 - 09:01 PM


I am trying to fix a stumble my bike has when cruising at medium revs (55-60 km/h in 3rd gear - 15/48 gearing) the bike pops/stumbles when on the low speed jet. I have tried adjusting my fuel screw everywhere from 1 through 3 turns out and nothing seems to get rid of this. Do all XR650R's do this? Am I being to picky or can this be sorted? I have a 68S slow jet, 4th pos on B53E needle and a 175 main at sea level.

  • Dutch

Posted February 12, 2003 - 03:26 AM


My guess is you are running too rich - try a leaner main jet,(easy to get to), first. My bet would be a leaner slow jet.

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  • XR650Rrider

Posted February 12, 2003 - 06:22 AM


I'm setup the same except I run the needle in the middle (3rd) clip position. Main jet only effects above 1/2 throttle. You can check if your running lean or rich. Reach down and close the choke slightly, if it runs better then you were running lean, if it runs the same or worse then you are jetted rich.

  • Guest_Guest_*

Posted February 12, 2003 - 09:09 PM


I went to my Honda dealer. They gave me the "SHOP TALK" sheet from Honda made for the mechanics. It says to use a main jet part # 99101-357-1750, and a needle part # 16012-MBN-641, and the stock slow jet. The needle should be in the 4th position, and the fuel screw 2 1/2 turns out. So I put the stock (65S) slow jet in and turned the fuel screw 2 1/2 turns out. Voila! Bike starts better and cruises more smoothly. I am at sea-level. I hope this helps somebody.

  • XR650Rrider

Posted February 13, 2003 - 04:45 AM


Here is a link to the original Honda document "The Wrench".
http://autos.groups....s/thewrench.jpg It lists all of the recommended modifications for closed course use. Go to http://groups.yahoo.com/ and join the XR650R group. There is a jetting database and about 15,000 posts you can search in the archive.

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