. Farm machinery and farm motors. FIG. 281—SUCTION STROKE OF FOUR-CYCLE ENGINE 404 FARM MOTORS I. FIG. 282—COMPRESSION AND IGNITION STROKE OF FOUR-CYCLE ENGINE or two complete revolutions of the crank are necessaryto complete this cycle, hence the name four-cycle. Thesestrokes may be enumerated as follows: The piston makesone forward stroke, drawing into the cylinder throughthe inlet a charge of fuel and air. This is called suction(Fig. 281). A second stroke compresses this charge

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