Genesis engine

Genesis is an engine design by the Yamaha Motor Corporation that debuted in the 1984 Yamaha FZ750.

The engine employs a DOHC design and uses five valves per cylinder with the cylinder group slant forwards 45 degrees. It used downdraft carburetors instead of the side draft carburetors that were more common at that time.

For more than twenty years, until the 2007 model year, the Yamaha YZF-R1 used a 5-valve head and downdraft intake design.