loosing power on rough ground

i noticed that when i was riding across washboard on fireroads or really rough stuff that the power cuts out significantly. its like it starts lugging all of the sudden and then when i get back on smooth stuff everything is fine. i know its not lugged ive got it revved plenty and im not in too high of gear either (1st and 2nd) any ideas? the bike shop told me they have never heard of anything like this, as with most my problems with this bike haha :ride:

o ya its a xrl 650

float level in your carb?......mmmmmmcould be

Is the bike stock?

uh engine and carb are stock no mods on those, well i rejetted actually didnt change the float when i rejetted or the needle. i have a aftermarket pipe and aircleaner. thanks for the replies

It is the CV slide bouncing. No cure.

whats CV slide? really nothing can fix this?

CV stands for constant velosity. It is a vaccume operated slide that is only held in place by a spring. Bouncing moves the slide up and down. Most people change to a conventional carb to stop the problem.

Replace it with a 650R carb (manual slide) and throttle, its cheap has better response and fits both carb and air filter boots.

where can i get a 650r carb? thats cheap cuz i was looking at one and it was like 300+?

where can i get a 650r carb? thats cheap cuz i was looking at one and it was like 300+?

I was able to get the whole set up for $100, from craiglist and ebay. I have seen them on Ebay for 200-300 too, I don't know what they are thinking, they can be found for a lot less. There is a thread about putting one on the XR650l search for that, I think it had what people paid for there set ups.

What about the kickstand switch?

I ride plenty of rough stuff and don't have this happen.

Is the slosh baffle still in the carb?

Perhaps drilling the slide helps with this.


What about the kickstand switch?

It is a possibility.


Also check your carbs vent hoses...it is good to install T fittings on each vent hose, then from each T route one hose up under the seat and one hose down like stock. This way if fuel sloshes up into the vent lines, your carb can still get air into the float bowl.

I ride plenty of rough stuff and don't have this happen.


check your kickstand switch, get something to hold the kickstand switch in the up position, that was the problem on my bike, got a band clamp and closed the switch, no more almost over the handlebar ejection over woops. this was on a DRZ400S

You could possibly be having some other problem, but what you describe is a classic desription of CV carb "flutter". There is no cure other than changing to a non-cv carb.


Removing the kick stand switch couldn't hurt.

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.