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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 ...
Australia - Same 83 - 85 models as UK/EU, but more 250s sold due to licensing restrictions for learner riders and provisional licence holders limited to 250cc motorcycles (though many fitted “RZ250” decals to the larger model). 1986 saw the introduction F2/N2, but in 1987 a round light full fairing model appeared.
It appeared in production on the 1974 Yamaha YZ-250, a model which is still in production, making it Yamaha's longest continuous model and name. Yamaha continued racing throughout the 1960s and 1970s with increasing success in several formats. The decade of the 1970s was capped by the XT500 winning the first Paris-Dakar Rally in 1979. [13]
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]
The RZV500R was designed exclusively for the Japanese home market although many have been exported privately. The RZV500R features upgraded parts not found on the standard RD500LC and RZ500. A major difference is the hand-welded aluminium frame, which is significantly lighter than the steel version used on standard models.
Yamaha entered the ATC market in 1980, after paying patent-right to Honda to produce their own version of the All Terrain Cycle. Starting modestly with a 125cc recreational ATC that would remain the foundation of their line through 1985, the YT125 featured a 2 stoke engine with sealed airbox with snorkel intake, an autolube oil injection system, and featured a narrow tunnel above the engine ...
In 2003 it received an aluminum subframe, which was replaced in the 2006 model with an all-aluminum frame. The YZ250F has been praised for combining the broad-power characteristics of a four-stroke engine with the light handling more common in smaller, 125 cc two-stroke motorcycles.
With the model TZ 250 C (1975), the chassis was revised, and a cantilever swing arm with central spring strut and disc brakes were introduced. The petrol tank held 23 liters, the oil supply was 1.5 liters. In 1991, the engine of the TZ 250 was thoroughly revised and adapted to the factory racing machine . The new model series, now with a V ...