2004 Polaris Sportsman 600/700 Service Manual, Page 111Get this manual
CV CARBURETOR SYSTEM FUNCTION
Carburetor Compo nent Function Syste m
Main Main Ma in
VENT SYSTEMSCV CARBURETOR
The carburetor float bowl vent lines supply atmospheric pressure to the float bowlThe lines must be free of kinks, restrictions and be properly routedThis allows fuel to flow in the proper amount and prevents contaminants from entering the carburetor
Components
Function
Maintain specified fuel le vel in float chamber {carburetor float bowl) atmospheric pressure to float cham-
Inlet PipeNeedle and Float Pin
All systems
A1llhrotUe
Cont, Seat, Float,
MIKUNI CV CARB OPERATION
The constant velocity carburetor incorporates mechanically operated throttle plate and vacuum contrOlled slide valve (vacuum slide) The venturi cross-sectional area in the carburetor bore is increased or decreased automaticalty by the vacuum slide, which moves according to the amount of negative pressure (less than atmospheric) present in the venturiA diaphragm attached to the top of the vacuum slide is seale! to the slide and to the carburetor body form ing two chambersThe chamber above the diaphragm is connecte! to the venturi area by drilled orifice in the center of the vacuum slideThe chamber below the diaphragm is vented to atmospheric pressure by passage on the air box side of the carburetorA springinstalled in the center of the vacuum slide, dampens the slide movement and assists the return of the slide