2007-2011 Polaris IQ Snowmobiles Service Manual, Page 163Get this manual
Fuel Systems MIKUNI VM CARBURETOR
Assembly View
Mikuni VM Carburetor Function
The function of carburetor is to produce combustible airfuel mixture by breaking fuel into tiny particles in the form of vapor, to mix the fuel with air in proper ratio, and to deliver the mixture to the engineA proper ratio means an ideal airfuel mixture which can burn without leaving an excess of fuel or airWhether the proper mixture ratio is maintained or not is the key to efficient engine operationThe engine is operated under wide range of conditions, from idling with the throttle valve almost closed, to full load or maximum output with the throttle valve fully openedIn order to meet the requirements for the proper mixture ratio under these varying conditions, low speed fuel system, or pilot system, and main fuel system are provided in Mikuni type carburetorsA Mikuni VM carburetor uses several components and fuel metering circuits to deliver fuel at all throttle opening positionsThese components and circuits include: