Slide Cutaway (1/8-3/8 Throttle) - Polaris Magnum 2x4 Service Manual

FUEL SVSTEM/CARBURETION
Slide Cutaway (1/8-3/8 Throttle)
Throttle valve cutaway effect is most noticeable at 114 throttle opening. The amount of cutaway is pre-determined
for a given engine to maintain a 14: 1 air/fuel ratio at part throttle. A steep angle would indicate a fairly lean mixture
because there is less resistance to air flow. A flat angle would provide a much richer mixture because there is
more resistance to air flow. The venturi shape can be adjusted for each engine's breathing characteristics by
using a different valve cutaway angle. A number will be stamped into the bottom of the valve (e.g. 2.5) indicating
the size of the cutaway. The higher the number, the steeper the angle.
Cutaway Angle
Throttle Valve
Air Jet
By-pass
Pilot Outlet
Pilot Jet
Needle Jet
Main Jet
3.0
1.5
Leaner
Richer
7/96
4.18
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