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Originally using a very oil-rich mixture of 8:1, from 1942 models specified a 10:1 mix which remained until 1979, when a 25:1 mix was ordained. Thereafter, a 50:1 mix was tried for the introduction of the models 125 and 170, but these engines with such a lean mix proved unreliable, and British Seagull resorted to the 25:1 ratio. [ 5 ]
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]
Length:8 ft (2.4 m) Beam: 889 mm (35.0 in) Engine Type 2-Cylinder, 2-Stroke; Bore/Stroke 81.0 mm × 68 mm (3.19 in × 2.68 in) Displacement 701 cc; Fuel Regular Unleaded; Type of Intake Reed Valve; Type of Scavenging Loop-Charged; Type of Exhaust Wet; Mixing Ratio 50:1 (with oil injection pump) Cooling Water; Starting Electric; Ignition CDI
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 ...
Single Cylinder , 2 stroke , Aircooled , case reed induction: Bore / stroke: 50 mm × 50 mm (2.0 in × 2.0 in) Compression ratio: 6.6:1: Top speed: 85 km/h (Manufacturer claimed) Ignition type: capacitor discharge ignition: Transmission: 4 speed constant mesh: Suspension: Front: Telescopic Oil Damped Rear: Swinging arm, hydraulic shock absorber ...
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