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  2. Gravely Tractor - Wikipedia

    en.wikipedia.org/wiki/Gravely_Tractor

    The tractor had four speeds, two in low range and two in high range, with power configurations of single-cylinder 10, 12, or 14 horsepower Kohler or Onan engines. In 1969 was the debut of the 16.5 HP Onan CCKA twin-cylinder powered Commercial 450, the most powerful tractor the company offered at the time.

  3. Four-stroke engine - Wikipedia

    en.wikipedia.org/wiki/Four-stroke_engine

    Four-stroke cycle used in gasoline/petrol engines: intake (1), compression (2), power (3), and exhaust (4). The right blue side is the intake port and the left brown side is the exhaust port. The cylinder wall is a thin sleeve surrounding the piston head which creates a space for the combustion of fuel and the genesis of mechanical energy.

  4. Gilson Brothers Co. - Wikipedia

    en.wikipedia.org/wiki/Gilson_Brothers_Co.

    When a UniTrol snowblower is running, the engine is always turning a drive platter. The act of engaging a gear presses a rubber-edged wheel against the flat steel surface of the spinning platter, which transfers power through 90 degrees to the drive axle and at a ratio inversely proportional to the distance from the center of the platter at ...

  5. Speedex Tractors - Wikipedia

    en.wikipedia.org/wiki/Speedex_Tractors

    The engine was Briggs & Strattion Model ZZ Gas Engine. The tractors included a Ford Model A Transmission and a Ford Model T Rear Axle. [4] This tractor had tiller steering with a single stick that would move forward and backward to control the steering gear. In addition to the Model B, Pond also produced a Model A and Model C Walk Behind tractor.

  6. Wheel Horse - Wikipedia

    en.wikipedia.org/wiki/Wheel_Horse

    There were eleven models in four lines of lawn and garden tractors by 1974: the 8 hp (6.0 kW) "economy" A Series with standard 32-inch mower and electric or recoil start, the "compact" B Series with a four-speed or automatic transmission, the C Series offering four models (the C-120 and C-160 automatic, and the C-100 and C-160 8-speed and the ...

  7. String trimmer - Wikipedia

    en.wikipedia.org/wiki/String_trimmer

    A 32 cc (32 cm 3; 2.0 cu in) engine can swing a 2.75 mm (0.108 in) line and often has metal-blade accessories. Most trimmers use single-cylinder engines (particularly two-stroke) and require gasoline mixed with oil. Due to pollution laws four stroke engines are becoming more popular