1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 348Get this manual
ENGINESCARBU RETION Jet Needle
The jet needle has five grooves for adjustment cut into the upper portion, and is tapered from approximately the middle of the needle to the lower endThe top is fixed to the center of the throttle valve by the needle clip, and the tapered end extends into the needle jetFuel flows through the space between the needle jet and jet needleWhen the throttle reaches the 14 open point the tapered portion of the needle begins to move out of the jetAs the opening enlarges the fuel flow is affectedIt follows that taper wear and the position of the needle clip in the grooves also affect fuel flow rateIf the needle clip is changed from the standard position to lower groove, the needle taper starts coming out of the jet sooner, resulting in richer mixtureMoving the clip to higher position produces leaner mixtureNeedle Jet