1978 Polaris RXL Service Manual, Page 39Get this manual
COMPONENT FUNCTION S )
JET NEEDLE
Th jet needle has grooves fo adjustment cut in he upper po rtion, an is ta pered from app rox ima tely he middl of he needl to he lower end Th top is fixed the ce nte of the hrott le valve by he need le clip, and he ta pered end ex te nds into th needl jetFuel flows throug he space between the need le jet and jet need le, wh ich space is un varying unti he rottle reac hes he 1 op en poi ntAt this ti me he tapered po rt ion of the needle begi ns to move out of he jet nd affect fu el flow as the opening enlargesIt foll ows that taper wea r, nd the posit io of he need le clip in the grooves also affect fuel flow rateIf he need le clip is hanged from the standard posit ion to lower groo ve, he needle .taper st arts coming out of he jet soone r, resulting in ric her mi xt ur e; movi ng he lip higher produces leaner mixt reNEED ET