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Two-stroke engines often have a higher power-to-weight ratio than a four-stroke engine, since their power stroke occurs twice as often. Two-stroke engines can also have fewer moving parts, and thus be cheaper to manufacture and weigh less. In countries and regions with stringent emissions regulation, two-stroke engines have been phased out in ...
In fact there was at least one valve in Joseph Day's original design, a simple check valve in the inlet port communicating directly with the crankcase, where you would probably find a reed valve on a modern two stroke. His patent No.6,410 of 1891/2 covered variants with a piston controlled transfer port or an additional check valve in the crown ...
Royal Enfield India (1962—1970s) Fantabulous model, 175cc 2-stroke Villiers powered — India [103] Rumi (1954–1969) Formichino model — Italy; Salsbury (1936–1950), Californian businessman E. Foster Salsbury introduced the CVT. Models included the Motor Glide (the world's first commercially viable motor scooter). — USA [104] Schwinn ...
Ryobi Limited (リョービ株式会社, Ryōbi Kabushiki-gaisha, Japanese: [ɾʲoːꜜbi]; English: / r aɪ ˈ oʊ b i / or / r i ˈ oʊ b i /) is a Japanese manufacturer of components for automobiles, electronics, and telecommunications industries.
YDS-3 (1964) 246 cc, two-stroke, parallel-twin, it used the world's first oil injection lubrication system in a 2-stroke engine. [2] DT-1 (1968) Yamaha's first true off-road motorcycle. [1] XS-1 (1970) Yamaha's first four-stroke engine motorcycle (650 cc twin). [3] YZ Monocross (1975) First production motocross bike with a single rear shock. [3 ...
TZR 250 2MA modified for racing. The Yamaha TZR250 is a motorcycle manufactured and produced by the Japanese motorcycle manufacturer Yamaha between 1986 and 1995. [3]Yamaha produced the road going two-stroke motorcycle, loosely based on the TZ250 Yamaha racing bike.
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