650R idle speed problem

5 replies to this topic
  • laborant

Posted December 18, 2006 - 03:08 AM


Hallo All,

I have just bought a 2001 XR650R and I'm having a problem with it.

It stalls at idle speed in a weird way.
I start it when it's cold with choke fully open then warm it up and close the choke. The engine works rough at idle speed for a minute then the speed increases without any assistance (I don't touch anything) and stalls.

When it stalls ones I can not start the engine without choke open and if it starts it just speeds up and stalls again.

What I have checked already:
- the filter in the tank is clean.
- carburetor is clean.
- spark plug is covered with black deposit
- engine runs at idle with the fuel screw completely closed.

Appreciate for any advice as my right leg is too tired to experiment .

  • HawkGT

Posted December 18, 2006 - 09:12 AM


What size are the jets? Has the engine been "uncorked"?

If it runs with the fuel screw screwed all the way in that is a sign the pilot jet is too big.

  • laborant

Posted December 18, 2006 - 10:49 PM


It is not a corcked bike as I bought it from Japan.

Pilot jet is 65 and main is 175

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • porterdog

Posted December 19, 2006 - 06:37 AM


What's the ambient temperature? 65 seems like a small pilot for winter conditions (though Hawk is right about the mixture screw). Weird.

  • spotsboss

Posted December 20, 2006 - 08:34 AM



It could be that your air cut-off valve is acting up. It leans out the mixture when you decelerate to lessen the chance of backfire. Revving up just before it dies may indicate a lean condition.

Or the bowl could be starving for gas. Make sure the float goes up and down freely. Same with needle.

Make sure the vent hose that attaches to the filler cap is O.K., too.


  • laborant

Posted December 22, 2006 - 01:53 AM


It was a petcock problem!

Thanks a lot for your help :thumbsup:)))

Related Content


Fell Off Trailer by usafxr

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • Hot  43 replies

Honda XR650L 2017 by Chris.GVS

Honda XR650L 2017
  • - - - - -
  • 0 reviews

Post Apocalypse, ThumperTalk style! by Justin Pearson

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  35 replies

XR650L super moto wheels by greggkklee

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • Hot  29 replies

Supercross Preview 2017 Part 1: Championship Contenders by Chris Cooksey

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  186 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.