Lastly your main jet controls the flow of fuel between the three quarter and wide open throttle positions. The needle jet controls the flow of fuel from the one eight position up to about the three quarter throttle position. The pilot jet, or pilot screw as it is sometimes referred to, controls the flow of fuel between Idle speed and about one eight of wide open throttle (WOT). Each jet is effective for a specific throttle position range. #1 – The first thing you need to remember is that ATV jetting refers to throttle position, not engine rpm. A comprehensive installation guide will come with the jetting kit you purchase for your make and model of ATV so instead this guide will focus on explaining the basic principles of how ATV jets work. You can tune your own ATV jets and avoid common jetting mistakes if you understand some jetting basics, explained below.
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