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Message: [QUOTE="FNG, post: 1392684, member: 89198"] Dial-a-jets are VERY common in the snowmobile world as we deal with large differences in temperature changes. Dialed in jetting @ 20 can melt a piston below zero. They are very convenient and work very well. Jet the machine for its' maximum need for fuel then use the dial-a-jet to lean it out from there. All you do is turn a screw to lean it out from your baseline. Not sure if an MX bike needs one. I have 2 main jets, 1 for below 60 degrees and one for above. I could probably go leaner, but it runs fine and I am getting lazy. [/QUOTE]