Multi-cylinder engine with horizontal crankshaft for motorcycles has intake and outlet channels located in cylinder bore rows with relative positions the same for two cylinder heads

摘要

The engine has intake (34L,R) and outlet channels (35L,R), positioned in cylinder heads (24L,R) according to cylinder bore rows (22L,R). Due to this, relative positioning between first intake and outlet channels (34L,35L) in axial direction of the crankshaft (29), is almost the same as between second channels (34R,35R) in the same direction. Each cylinder head has a camshaft (46L,R) to open/ close intake (36L,R) and outlet valves (37L,R). A control mechanism (68L,R) halves the RPM and transmits it to the camshaft.