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499 cc (30 cu in), 2-stroke, four-cylinder, liquid-cooled, reed valve induction with YPVS Bore Stroke 56.4 mm × 50.0 mm (2.22 in × 1.97 in) Compression Ratio 6.6:1 Fuel System Mikuni VM26SS 26 mm (1.0 in) carburettor x 4 Lubrication Yamaha Autolube two stroke injection, transmission gear pump. Ignition
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 ...
A familiar type sometimes seen on small motorcycles is a slotted disk attached to the crankshaft, which covers and uncovers an opening in the end of the crankcase, allowing charge to enter during one portion of the cycle (called a disc valve). Another form of rotary inlet valve used on two-stroke engines employs two cylindrical members with ...
Introduced in 1967, the 350 GTR was powered by an air-cooled, 345 cc (21.1 cu in), two-stroke, straight-twin engine, which produced 37 hp (27.6 kW; 37.5 PS) at 7,500 rpm. The engine used the rotary disc-valve induction system, two of these disc valves were used (one per cylinder), and a 26 mm Mikuni carburettor was bolted to each one. The six ...
The original YZ250 of 1974 used an air-cooled 250cc two-stroke engine of 70 mm bore and a 64 mm stroke, which was improved semi-annually. The air-cooled motor was replaced in 1982 with a 249 cc liquid-cooled two-stroke reed-valved engine with a mechanical, rather than servo-driven, YPVS exhaust valve for a wider spread of power. Although other ...
It evolved directly from the piston port (pre-reed valve intake tract), front drum-braked, five-speed Yamaha 350 cc "R5". [3] The engine is an air-cooled, parallel twin, six-speed (in some markets, such as the UK, the first model was sold in five-speed form), reed valve-equipped intake tract two-stroke engine. The bike is usually referred to as ...
The Yamaha RZ350 is a two-stroke motorcycle produced by Japanese motorcycle manufacturer Yamaha between 1983 and 1996. Available in the US from 1983 to 1985, Canada until 1990 and Brazil until 1996. Available in the US from 1983 to 1985, Canada until 1990 and Brazil until 1996.
The SR400 has an air-cooled 4-stroke single cylinder SOHC 2-valve engine with a dry-sump, with the downtubes of the motorcycle's frame serving as the engine's oil reservoir and cooling system, [6] thereby eliminating the need for an external oil cooler, reducing engine pumping losses, and allowing increased ground clearance as well as reduced ...
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