2016 Kawasaki Mule 610 4x4 XC SE Owner's Manual
Oil is separated from the gases while passing through the inside of the breather chamber from the crankcase, and then returned back to the bottom of the crankcase. The carburetor has been calibrated to provide lean air/fuel mixture characteristics and optimum fuel economy with a suitable air cleaner and exhaust system. A maintenance free ignition system provides the most favorable ignition timing and helps maintain a thorough combustion process within the engine which contributes to a reduction of exhaust pollutants entering the atmosphere.
Also, vapors caused by fuel evaporation in the fuel system are not vented into the atmosphere. Instead, fuel vapors are routed into the running engine to be burned, or stored in a canister when the engine is stopped. When the vehicle is used at high altitude, the thinner atmosphere makes the air/fuel mixture richer reducing performance and increasing fuel usage.
To improve the performance of vehicles operated at high altitude, optional replacement of certain carburetor components are available. Have the carburetor adjusted by your authorized Kawasaki dealer if you intend to use this vehicle above 500 m (1 600 feet). However the carburetor must be returned to original settings before using at lower altitudes.