2-18Power unit system012345678910APower unit systemOutline of systemF150B is equipped with L 4, 4-stroke engine.The offset crank shaft is used, in which the crankshaft centerline is offset by 10.0 mm (0.39 in) fromthe cylinder centerline.The long intake manifold made from plastic is used for higher intake efficiency to obtain higher out-put power.The larger intake silencer is useful to suppress the noise.a Oil/gas separatorb Pistonc Connecting rodd Offset crankshafte Intake manifoldf Throttle bodyg Intake silencerabcdfgeElectronic control system / Power unit system