2007 Polaris Two Stroke Snowmobile Workshop Repair manual, Page 89Get this manual
FUEL DELIVERY Jet NeedleNeedle Jet
The jet needle and needle jet have the most effect between 38 and 34 throttle openingSome mixture adjustment can be accomplished by changing the location of the "E" clip on the needleMoving the clip down raises the needle in the jet passage and enriches the mixtureMoving the clip up lowers the needle in the jet passage and leans the mixtureLetter and number codes are stamped into the needle and the jet indicating sizes and tapers (taper of needles only) of each