& production motorcycles with 8-valve-per-cylinder "oval-piston" V4 engines (actually 32-valve V8s with adjoining cylinders merged). 1985 Yamaha FZ750 motorcycle with DOHC 20-valve straight-4 Yamaha "Genesis" engine. 1991-2010 Yamaha TDM and TRX parallel twin motorcycles with 5 valves per cylinder 1998–2006 Yamaha YZF-R1 superbike with redesigned (more compact) "Genesis" engine. 2006 model delivered at 12,500 rpm (130.3 kW/liter). The Yamaha XT660 single once had five valves per cylinder, but a subsequent redesign reduced the valve-count to four. The Aprilia Pegaso 650 single also started out with five valves, but current models only have four. The jointly developed BMW F650 single always had four valves. Aircraft Ettore Bugatti designed several multi-valve aircraft engines. The 1916 Bugatti U-16 1484.3 cid (24.32 L) SOHC 16-cylinder, consisting of two parallel 8-cylinder banks, offered 410 bhp (305 kW) at 2,000 rpm (12.5 kW/liter or 0.28 bhp/cid). Each cylinder had two vertical inlet valves and a single vertical exhaust valve, all driven by rocking levers from the camshaft. Other advanced World War I aircraft engines, such as the 1916 Maybach Mb.IVa that produced at altitude and the 1916 Benz Bz.IV with aluminium pistons and the 1918 Napier Lion (a 450 bhp 24-liter DOHC 12-cylinder), used two intake valves and two exhaust valves. Long after the King-Bugatti "U-16" aviation engine used them, shortly before World War II, the Junkers aviation firm began production of the Third Reich's most-produced military aviation engine (68,000+ produced), the 1936-designed, 35-litre displacement, inverted-V12, liquid-cooled Junkers Jumo 211, which used a three-valve cylinder head design inherited from Junkers' first inverted V12 design, the 1932-origin Junkers Jumo 210 — this was carried through into the later, more powerful 1940-origin Junkers Jumo 213, produced through 1945, the production versions of which (the Jumo 213A and -E subtypes) retained the Jumo 211's three-valve cylinder head design. The V12 engines of many World War II fighter aircraft used a SOHC configuration with four valves for each cylinder. An example of a modern multi-valve piston-engine for small aircraft is the Austro Engine AE300. This liquid-cooled turbocharged 2.0-liter (1,991 cc) DOHC 16-valve straight-4 diesel engine uses common rail direct fuel injection and delivers at 3,880 rpm (62.0 kW/liter). The propeller is driven by an integrated gearbox (ratio 1.69:1) with torsional vibration damper. Total power unit weight is . Boats In 1905 car builder Delahaye had experimented with a DOHC marine racing engine with six valves per cylinder. This Delahaye Titan