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12 hp Briggs & Stratton, Model No. 300421, 4 cycle, single cylinder, horizontal crankshaft engine. Air-cooled with mechanical governor. "Synchro-balanced engine," reducing vibrations 60% vertically and 85% horizontally. Stellite exhaust valves with Stellite seat for longer life.
Hydrostatic drive gives finger-tip speed control, eliminating gear shifting. Choice of Hydrostatic
or Variable Speed Drive.
Hydrostatic drive gives infinite number of speeds forward up to 6.9
mph. Variable Speed Drive forward speeds vary from 0.8 to 6.6 mph.
Reverse speeds up to 3.4 mph.
Easy-Spin electric starter, 12-volt system with 40 amp battery, key ignition switch, 3-stage voltage regulator.
Combination clutch-brake for positive control. Depressing clutch halfway declutches unit, depressing all the way down applies brake.
Controlled Traction Differential--when one wheel is on slippery surface, other rear wheel continues to drive.
31½ inches on inside wheel.
Steering ratio 4.1 to 1 gear reduction.
Without attachments--34½ inches wide x 72 inches long x
37¾ inches high.
Pneumatic tires 23 x 8.50 x 12 in rear and 18 x 6.50 x 8 in front
Deluxe foam rubber bucket seat.
[Source: Simplicity -- for picture perfect outdoor maintenance,
1969 Product Catalog, Form No. 868, courtesy of John Boesch]