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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Posted on Jan 02, 2017

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1 Answer

I have a 1980 rm125 and I have a 140 main jet on it is that the right jet or if not please tell me the right stock jetting.


You should really have the workshop manual if you are working on the carb. Not only will this tell you the correct main jet size, you will also get the pilot jet size, mixture screw, and jet needle positions. All of these should be checked if you're taking apart the carb yea?

Mar 10, 2015 | Motorcycles

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I put a fmf slip on, on my 06 Suzuki 125 drz-l and it is running a bit lean I was wondering what size I should go with on the jetting?


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When you find the right size, then buy a jet in that size.

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How to rejet 2001 fxd


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Use a DYNAJET kit & go with the directions. Or check with the Hypercharger manufacture for correct jetting. But you will still need different needles & main jets for those pipes.

Jan 18, 2014 | 2001 Yamaha XVS 650 Dragstar Classic

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Hi, Mark for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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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.
Steps:
  1. Idle - if it's fat at the bottom it will gurgle and overload and has tendency to run bad and stall at start. Adjust the air screw out about 1 1/2 turns. May need smaller jet size.
  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.
Thanks for contacting FixYa,
TF

Jul 10, 2011 | 2010 KTM 65 SX

1 Answer

Just bought a 2001 WR 426. Has an FMF pipe, no air box lid. Main is a #165 and pilot is a #42.these are stock jets according to shop manual. My elevation is 2500-3000 Ft. Any ideas on jetting?


Hard to give accurate info with out seeing the bike with jetting but I would suggest take a reading from the fuel air screw if the bike running better with the fuel air screw in carbi at 2.5 turns out or more then definitely increase pilot jet up 1 or 2 sizes if you get the bike to run well between one - two turns out on the fuel air screw that is where your jetting should be
I wouldn't be concerned with main jet at all - it should be fine for wide open throttle unless you feeling power loss when you open it right up
also if you are getting backfire or popping when de accelleration that also hints toward lean pilot so a size or two change in pilot jet would be worth trying

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1 Answer

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Stock Jetting for a 1994YZ250 is:

350 main
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Adjust your jetting down one size for each 1000' of elevation above sea level. Needle clip position on the needle fine tunes the pilot circuit.

Scott

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1 Answer

I have a GSXR 750 1990 model and would like to know the std jetting sizes


The stock main jet is 127.5. The stock pilot jet is 32.5 The stock jet needle is 0-8. The sizing on the needle refers to the taper in diameter.

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1 Answer

What jets should i be using in a crf 250r


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