Main System (3/4 To Full Throttle) (2 Cycle) - Polaris Trail Blazer Service Manual

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FUEL SYSTEM/CARBURETION

Main System (3/4 to Full Throttle) (2 Cycle)

The main system is designed for delivering fuel between low speed and high speed operation. This system is

made up of the jet needle, needle jet, and main jet. The main system begins to take effect as soon as there is

enough air flow into the carburetor venturi to draw fuel up through the main jet and needle jet assembly. This

system works in conjunction with the needle jet system.

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 jet. As the throttle valve opening is

increased, the tapered jet needle is raised farther out of the needle jet, allowing greater fuel flow. Under 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 jet. Thus the main jet is now controlling the amount of fuel flow.

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Throttle Valve

Pilot Outlet