Maintenance & Technical > KX500 Original

jetting suggestions for high 20's f

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mdw471:
Hello All

I have a chance to take my bone stock kx5 on the ice this weekend and wanted to be sure about jetting.

the temps are supposed to be between 25 and 32 farenheit.....

I am guessing that one maybe two main jets larger and richen the needle one step.

Thanks

Mark

Hillclimb#42:
What temp was it running at last? You are right to think you will be running lean, but I think that there other things in it to consider. Where is your mixture screw? If you have it out 1 1/2 turns or more you can make the adjustment there. If you are in too far already then, you would have to fatten the jet one size, but it would have to be extreme differences to think you would need to fatten by two. How has the plug color been at current setting with warmer temps?
 I believe needle setting should stay the same, unless it hits too hard to ride. It basically controls throttle response IMO.
  I would turn the screw in one full turn and start it up and ride it at that temp to see how close you are. The safe thing to do is to refer to jetting chart and apply your temp and elevation and compare to what you have. If your k5 is bone stock, it should tell you exactly on jetting, needle and mixture screw and it will run like a new one.
  It will probably be easier to ride if you gear down some on ice and snow. Ride on the grunt power.

mdw471:
holy cow....13 minutes and a great answer :-D

Thanks for the help HC#42

Mark

kaw rider:
i would move the needle like you said. richer setting. every 20* change i would make a change to main and needle.

KXcam22:
Keep an eye on the main jet.  Typically you will need to run at least 2 sizes larger.  Keep in mind that it is not the temp but the extra density of the air at the cold temp (more o2) that will make it run lean. Sorry that I don't have exact jetting specs.  Dezert sizing for the main might be close, high speed heavy load. Cam.

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