Polaris Hawkeye User Manual

4.11
FUEL SYSTEM / CARBURETION
JET NEEDLE
The jet needle has five adjustment grooves cut into the
upper portion, and is tapered from approximately the
middle of the needle to the lower end. The top is fixed to
the center of the throttle valve by the needle clip, and the
tapered end extends into the needle jet. Fuel flows
through the space between the needle jet and jet needle.
This space does not vary until the throttle reaches the 1/4
open point. At that time the tapered portion of the needle
begins to move out of the jet, affecting fuel flow as the
opening enlarges. If the needle clip is changed from the
standard position to a lower groove, the needle taper
starts coming out of the jet sooner, resulting in a richer
mixture. Moving the clip higher produces a leaner
mixture. If the taper is worn due to vibration, fuel flow may
be significantly affected.
NEEDLE JET
The needle jet works in conjunction with the jet needle to
regulate fuel flow rate. An air bleed opening in the side of
the needle jet brings in air measured by the air jet. This
air initiates the mixing and atomizing process inside the
needle jet.
THROTTLE OPENING VS. FUEL FLOW
In a full throttle condition the cross sectioned area
between the jet needle and the needle jet is larger than
the cross sectioned area of the main jet. The main jet
therefore has greater control over fuel flow.
Leaner
Richer
Position#
Jet Needle
Needle Jet
Main Jet
Closed
Throttle
One-half
Throttle
Full
Throttle
Small
Clearance
Medium
Clearance
Large
Clearance

Polaris Hawkeye Specifications

General

Brand	Polaris
Model	Hawkeye
Category	Offroad Vehicle
Language	English