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The Yamaha V-Max, (or VMAX) is a cruiser motorcycle produced by Yamaha from 1985 through 2020. Known for its 70° V4 engine , shaft drive, and distinctive styling, the V-Max was discontinued following the 2020 model year.
A four-stroke power valve is a device fitted to four-stroke engines that constantly adjusts the internal diameter of the exhaust system to better suit the speed of the engine. Yamaha was the first to develop such a system, called the Exhaust Ultimate Power Valve (EXUP). [1] It first appeared on the Yamaha FZR EXUP and was later used on many ...
A stroke is the action of a piston travelling the full length of its cylinder.In a two-stroke engine, one of the two strokes combines primarily the intake stroke and the combustion stroke, while the other stroke primarily combines the compression stroke and the exhaust stroke, though technically since both ports are exposed during both the combustion and compression strokes, some reversion ...
Yamaha started development of the OX66 in 1984 [1] as a design concept for a lightweight and compact Formula Two engine with a wide power band.. At the time of development, both BMW and Honda provided engines for F2 (in the form of the M12/7 inline-four and the RA260E V6 respectively), but Honda's engine yielded superior results despite limited use.
1984 MK1 Yamaha Venture Royale The 1,198 cc (73.1 cu in) V4 engine from the Mk1 Venture was modified for performance and was used as the engine in the Yamaha V-Max . Yamaha resurrected the Venture's V4 engine in 1996 in the Royal Star cruiser, then later brought out a full touring version in 1999 as the Royal Star Venture .
These secondary valves are called "secondaries" by SHO enthusiasts. Power was similar too, at 235 hp (175 kW) and 230 lb⋅ft (312 N⋅m) of torque. [1] Bore and stroke were identical to the Duratec 25 at 82.4 and 79.5 mm (3.24 and 3.13 in), respectively. The engines shared other traits as well, and insiders report that the designs are related ...