1999 Polaris SLH, SLTH, SLX, SLTX, PRO785 Factory Service Manual, Page 94Get this manual
FUEL SYSTEMCARBURETION System OperationKeihin Carburetor The Keihin CDK II carburetor is floatless diaphragm typeSeveral separate but overlapping systems are used to meter fuel and air properlyRefer to the illustrations on page 3.26 and 3.27Air Metering System
The metering of air is controlled by the throttle plateThe position of the throttle plate determines which fuel delivery system or systems supply fuel from the fuel chamber to the engineInlet Needle Valve SystemFuel Chamber