2003 Polaris Scrambler 50-90 Sportsman 90 Predator 90 Service Manual, Page 63Get this manual
FUEL SYSTEMCARBURETION During low speed driving, there is very little clearance between the jet needle and the needle jet; therefore, very little fuel from the main jet can pass between the jet needle and the needle jetAs the throttle valve opening is increased, the tapered jet needle is raised farther out of the needle jet, allowing greater fuel flowUnder full throttle opening, the cross sectioned area of clearance between the jet needle and the needle jet becomes greater than the cross sectioned area of the main jetThus the main jet is now controlling the amount of fuel flowGeneral Carburetor Representation
General Carburetor Representation Clip Position (Shown in #3) Throttle Valve Air Jet Air Box Side Jet Needle By-pass Pilot Outlet Engine Side
Pilot Jet Needle Jet Main Jet Air Jet Air Box Side
Throttle Valve Jet Needle By-pass Pilot Outlet Engine Side
Leaner Richer