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Unlike a four-stroke engine, the crankcase of which is closed except for its ventilation system, a two-stroke engine uses the crankcase as part of the induction tract, so oil must be mixed with gasoline to be distributed throughout the engine for lubrication. [1] The resultant mix is referred to as premix or petroil. [2]
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.
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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.
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 ...
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1979 Yamaha L2 Yamaha L2 Super (1984) left emblem Yamaha L2 Super (1984). Yamaha L2 is a motorcycle produced by Yamaha in Indonesia from 1967 until 1979. In 1980 it was replaced by the L2 Super.
Premix usually refers to a substance or object which is mixed in an early stage in the manufacturing and distribution process. The term may refer to: Compound feed, animal food; Premix and postmix, methods of serving soft drinks; Premixed flame; Premix, the first part of the traditional Re-recording process by a re-recording mixer