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Like the L50, it is a water-cooled two-stroke twin, but has 446 cc (27.2 cu in) from a 68 mm × 61.5 mm (2.68 in × 2.42 in) bore and stroke. Appearing only in the L60 Carry, it was fitted to provide more power and torque to export markets not having regulations regarding engine size.
2.50-18 / 2.50-18 #8 1967 RK67 on display. The Suzuki 50 GP racers were a series of 50cc racing motorcycles designed, developed, and built by Suzuki , to compete in the Grand Prix motorcycle racing world championship, between 1962 and 1968.
The racing shop built a 50 cc racer based on Tohatsu's 50cc twin-cylinder racer. Knowing the weaknesses of the Tohatsu machine, the new engine was designed to overcome these issues. The main problem was overheating, so water-cooling was used for the cylinders and heads. A race kit was also developed for the 90 cc production engine. [8] [23]
The "Pure Enduro" series of off-road racing motorcycles ran from 1977 through to 1984 in engine displacements from 175cc through 400cc. All engines were case-reed valve, air-cooled, two-stroke and single-cylinder with plain steel bores. Lubrication was provided via 20:1 pre-mix.
Animation of a two-stroke engine. A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston (one up and one down movement) in one revolution of the crankshaft in contrast to a four-stroke engine which requires four strokes of the piston in two crankshaft revolutions to complete a power cycle.
It is a rare configuration, which has been mostly used in two-stroke engines for motorcycles competing in Grand Prix motorcycle racing. The first example was the 1955 DKW 350 . [ 1 ] The 1968 Suzuki RP68 was intended to compete in the 1968 season, however a rule change mandating single-cylinder engines meant that the 50 cc (3.1 cu in) RP68 ...