4.3
Fuel System
4
9923396 - 2007-2012 EDGE/Widetrak LX Service Manual
©2011 Polaris Sales Inc.
MIKUNI VM CARBURETOR
Assembly View
Mikuni VM Carburetor Function
The function of a carburetor is to produce a combustible
air/fuel mixture by breaking fuel into tiny particles in the
form of vapor, to mix the fuel with air in a proper ratio, and
to deliver the mixture to the engine. A proper ratio means
an ideal air/fuel mixture which can burn without leaving an
excess of fuel or air. Whether the proper mixture ratio is
maintained or not is the key to efficient engine operation.
The engine is operated under a wide range of conditions,
from idling with the throttle valve almost closed, to full load
or maximum output with the throttle valve fully opened. In
order to meet the requirements for the proper mixture ratio
under these varying conditions, a low speed fuel system,
or pilot system, and a main fuel system are provided in
Mikuni type carburetors.
A Mikuni VM carburetor uses several components and fuel
metering circuits to deliver fuel at all throttle opening
positions. These components and circuits include:
• Starting (Enrichment) Circuit
• Float System
• Idle Speed Adjustment
•Air Screw
• Idle / Slow Speed (Pilot) Circuit
• Throttle Valve / Cutaway
• Needle Jet
• Jet Needle
• High Speed (Main Jet) Circuit
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