XR650r Jetting specs

2002 XR650r stock motor...pro circuit t-4 pipe...175 main..unknown pilot.

idles fine, easy to start...as long as the throttle is rolled on smooth, it runs perfect. but, hammer it quickly it hiccups.. i've searched for a list of carb-jetting-needle position specs, b ut can't seem to find them. Any help would be appreciated. Thanks!

Is that a T-4 header/muffler setup. The full exhaust? What air filter? You need a 68s or 70s pilot. Do you have the br53e needle? You need a 178 main if you are just using the muffler (at see level) and if you are running a UNI, holes in the side cover and header you need a 182 or 185 main.

Thank you, yes, it's a full exhaust. Guess i'm going shopping. I bought the bike used, I think the previous owner changed the mainjet only. Thanks again!!

With the stock carb, opened airbox, UNI filter, header and pipe, my bike liked the 185 Main jet, B53F (not "E") needle in the 4th position (second from bottom) and 70s pilot jet. The plug was a good color and had a nice strong, smooth powerband.

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

  • Similar Content

    • By mrdsee
      ~177 Titanium bolts, nuts, washers etc leftover from various motorcycle projects. XR650, YZ 125, YZ250 a mix of new and used once hardware.
      Made by Mettec
      Over $2k worth of hardware
    • By Xr600guy
      So I don't seem to find my specific issue so here I am asking. 
      I have a 1997 Xr600r. It was recently re-jetted and has ran really well ever since until more recently it has begun to have this issue.
      Everything works fine. Kicks right away, nice and easy. Runs great, sounds great, purs. But when I'm downshifting and slowing down to a stop, if I let my hand off the throttle that's when it just dies. I found that I can counter this by lightly holding the throttle as I down shift (so I'm revving quite a bit during downshift).  But it hadn't done this before. 
      The only thing I've done that I suspect may have been an issue on my part was when I pulled out the engine to change the valve cover gasket and upon doing so perhaps when connecting the carb back to it, I may have missed something or made a crack in the boot? 
      Any ideas? Thanks 
    • By Kenya
      Hello all,
      There's been a lot of talk about how to register a dirt bike in states that don't allow it.
      I just moved to North Carolina and for the first time in my life might be able to afford a bike. I've been dreaming about an XR650R for a long time, but they're not cheap. Plated bikes seem to be more expensive too. So here's my question, has anyone tried to plate a dirt bike by adding all the necessary features and having it inspected as a custom bike? Anyone know of another way I can plate an xr650 in NC?
    • By Jsmoot
      Hoping for some help before I throw in the towel and end it all!
      Engine starts fine, runs and idles well for +/- 10 minutes, but cuts out while riding once the engine warms up (175 - 185) and intermittently cuts out thereafter (any speed/gear). It will start up after 30 seconds or so (but won't run for long before dying again). No spurting or surging.. just dies.
      I've replaced CDI (twice), Spark plug, spark wire and coil, and most recently pulse generator. I do have a 41mm Flat side carb from a CRF (and it has more power than the old carb setup), breathing through a Uni filter. Also, sealed battery tender battery (hasn't shown low when trickle charged).
      What's next on the test/replace list? Stator maybe? Please help...
    • By Richard Stevens
      I found a buddy that’s going to help me with the “Dave’s Carb Mod” after that what size jets should I order before we begin? I’m in Cols Ohio and 1140 above sea level. Should I just order the Dyno kit or FMF kit or should I just go to jets r us and order 2-3 from there? Thanks all so much help. Love it. Stay safe out there.