Question about 2006 KTM 250 SX-F

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Jetting size 06 sx250f

What is the current jet size? going to Colorado and the local dealer says to drop one to two sizes on the main jet.

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Jetting is not an exact procedure. too many variable altitude, temperature, humidity, gaz.. does your bike presently run rich or lean ..ect..
i would go 1 size to start. it's safe to run an engine too rich but is risky to run too lean

Posted on Jul 22, 2009


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I got a 2010 ktm 65 sx. Can't keep spark plugs in it. Always fouling them.Mixture is 60;1 What factory recomends. Any help wolud be appreaciated.

Thank you for contacting FixYa with your KTM Inquiry.
More than likely you have a jetting problem. My first thought would be to call the dealer service department and ask what jetting they suggest for the local area you are riding. May or may not be able to advise you and want you to bring it in. Check your user manual and see if any jetting suggestions exist. Pretty easy do it your self fix.
Start by cleaning your air cleaner so it's not drawing excessive fuel to air mixture. Replace fuel filter and confirm gas tank vent tube is not pinched or plugged.
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  2. Middle - Needle Jet and Tower. If it runs bad at half throttle to 3/4 this may be allowing over fueling. Simple fix is to lower the slide cir-clip holding the slide to a lower notch allowing the needle to project further down in to the pilot and leaning out the mixture bypassing the needle.
  3. Main Jet - Allows for optimum speed when you have the wire tight at high rpms. If it's fat and not running right go down a size on the main jet. Engine should have a smooth scream.
Jet's are comparatively inexpensive so experiment a bit until you get a cocoa brown spark plug color after a good run. As always make sure your float is working correctly and no shellac exists from winter storage with old gas.
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