Page 22 of Kawasaki Mules Catalog by Kawasaki USA

Engine The MULE 610 4x4 is powered by a 401cc, 4-stroke, OHV, fan air-cooled engine. Simple, compact, lightweight, and durable, the engine is extremely reliable. U.S. produced engine is a modified version of FJ400 engine sourced from the highly respected Small Engines division of Kawasaki. For use in the MULE 610 4x4, the engine receives higher performance intake and exhaust passages, larger valves, and higher compression. Overhead valves designed for efficient running and good fuel economy, are durable, and operate quietly. Highly efficient carburetor delivers excellent fuel economy. To ease cold starting, a choke cam holds the throttle open 20% when full choke is applied. A cyclone-airflow-type air cleaner is fed via a snorkel intake routed through the overhead cab frame providing the engine with a steady supply of clean air, even in dusty conditions. Crankcase breather routes blow-by back to the intake pipe for cleaner emissions. Engine can be started in gear if the brake is applied just like KVF models. Sensor mounted in the engine crankcase monitors oil temperature to warn the driver of overheating. Gear driven engine balancer controls engine vibration.

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