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300ex jetting problem/questions

5788 Views 20 Replies 4 Participants Last post by  Billy250X
I got a 1996 300ex with a k&n w/ outerware and removed airbox lid and a hmf slip on with stock head pipe. Really no other performance mods but i got a 40 pilot with a 130 main in it does that sound correct? Cuz i tryed 2 do a spark plug check but its freezing cold here and almost 2 feet of snow on the ground. The new plug i put in came out still shiny and looked new still. Shouldnt it have come out like a brown color?
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Yeah, you really need to rapp it up into 5th gear then kill the motor. I don't know if just revving will do it. Your jets won't be the same from winter to summer. Cold air is more dense.
Keep coming back, I'm sure you can help others with their problems and we love talking atvs
Usually going up one size on the pilot jet for the winter months works. Assuming you're jetted correctly during the summer.

Do you have any problems during the summer or did this just come about?
Put your lid back on and go up one size on your pilot jet. See how she runs!
I just replied to your PM.
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