HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
Guest Guest

XR650R fuel screw adjustment/stumble

5 posts in this topic

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.

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0