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The Roadking though, still retained the protuberance on the left engine cover that housed the oil pump in the Oilking. The Yezdi Roadking was based on the 1974 CZ 250 Falta, where the original bore and stroke of 70 mm × 64 mm (2.76 in × 2.52 in) was retained, but detuned for lower power than its Motocross original. The engine block is smaller ...
Silkolene 2-stroke oil was directly injected into the inlet tracts and onto the main roller bearings. The oil that entered the combustion chamber lubricated the rotor tips and was then total-loss, but the oil that fed the bearings became a mist within the rotor-cooling air, and around 30% [ 2 ] of that oil was recovered and returned to the ...
JASO M345 is a quality classification standard for two stroke engine oils for engines of Japanese origin. It was introduced by the Japanese Automotive Standards Organization (JASO) in 1994 as JASO M345-93 with the quality levels JASO FA, JASO FB and JASO FC – with FC setting the highest standard.
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 ...
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 ...
The 1911 patent diagrams show the current 2-stroke to be '2-port', i.e. with the inlet being by non-return valve into the transfer port, with ball races for the main bearings and deflector type piston. The inlet non-return valve is the subject of another Stuart Turner patent in 1911, naming Ernest Masters as co-applicant. [15]
API TC is a certification for two-stroke oils, awarded by the American Petroleum Institute. It is given after the product passes through stringent tests that determine the level of detergent performance, dispersion, and anti-oxidation. It is the only remaining, not revoked classification of the API Two-Cycle motor oil specifications (TA, TB, TC ...
In spite of the huge success of the 269 cc two-stroke, the four-stroke engine had not completely been shelved, as in October 1914, J.H Motors of Oldham announced [3] two motorcycles, the No.1 fitted with a 2.75 hp Villiers four-stroke engine of 349 cc (74.5 x 80 mm bore and stroke), and a 2.5 hp two-stroke model using the Villiers 269 cc engine ...