Polaris SCRAMBLER 90 User Manual

FUEL SYSTEM/CARBURETION
3.7
inside the needle jet.
Needle Jet
Main Jet
THROTTLE OPENING VS.
FUEL
FLOW
In a full throttle condition the cross sectioned area
between the jet needleand the needlejetis largerthan
the cross sectioned area of the main jet. The main jet
therefore has greater control over fuel flow.
Small
Clearance
Medium
Clearance
Large
Clearance
Closed
Throttle
One-half
Throttle
Full
Throttle
THROTTLE SLIDE
The throttle slide controls the rate of engine air intake
by moving up and downinside the main bore. At small
throttle openings, air flow control is performed chiefly
by the cutaway. By controlling air flow the negative
pressure over the needle jet is regulated, in turn
varying the fuel flow.
Cutaway
Air Box Side
Engine Side
Higher cutaway number = leaner mixture
Throttle Valve
The throttle valves are numbered 1.0, 1.5, 2.0, etc.,
according to the size of the cutaway. The higher the
number, the leaner the gasoline/air mixture.
MAIN JET
When the throttle opening becomes greater and the
area between the needle jet and jet needle increases,
fuel flow is metered by the main jet. The number on
the jet indicates the amount of fuel CCs which will
pass through it in one minute under controlled
conditions. Larger numbers give a greater flow,
resulting in a richer mixture.
Hex Style
Main Jet
Main Jet
Larger Number = Richer Mixture
Main jets are screwed directlyinto the needle jet base.
Enfocus Software - Customer Support

Polaris SCRAMBLER 90 Specifications

General

Brand	Polaris
Model	SCRAMBLER 90
Category	Offroad Vehicle
Language	English