1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 342Get this manual
ENGINESCARBURETION
Function of VM Carburetor
The function of carburetor is to produce combustible fuelair mixture by breaking fuel into tiny particles in the form of vaporIt then mixes the fuel with air in proper ratio and delivers the mixture to the engineA proper mixture ratio means an ideal airfuel mixture which can burn without leaving an excess of fuel or airWhether or not this mixture ratio is maintained is the key to efficient engine operationThe engine is operated under wide range of conditions from idling, with the throttle valve remaining almost closed; to full load, maximum output, with the throttle valve fully openedIn order to meet proper mixture ratio requirements under varying conditions, low speed fuel system or pilot system, and main fuel system are provided in Mikuni VM carburetorsThe Mikuni carburetor varies operations depending upon varying driving conditionsIt consists of the float system, pilot system, main system, and starter system or initial starting deviceFloat System