Mower History — Part IV


The new generation series of Lawn-Boy mowers combines 68 years of two-cycle technology with advanced engineering and manufacturing procedures. The final result is an all new look from the “grass up.” 21 fewer parts, less weight, and introducing an all-new F-series Lawn-Boy engine which produces 20 to 30% more usable power.

Lawn-Boy has retained and refined all the outstanding features that have made us famous:

  • Easy fingertip starting — a reduced 4-to-1 gear ratio resulting in the easiest-starting mower in Lawn-Boy’s history.
  • Quiet operation — featuring a new exhaust system. The welded muffler assembly contains an additional baffle and muffler tube designed as a one-piece assembly secured to the mower with only three screws.
  • Super vacuum action — the design of the mower housing and famous durable Lawn-Boy high lift blade has been improved to discharge clippings into the rear of the grass bag — this creates a well-manicured mowing appearance. Also added under the deck is a crankshaft support located approximately two inches above the blade to provide additional protection for the crankshaft and crankcase.

The new generation began in the summer of-1972. WHY?

  1. contain fewer parts;
  2. design a new engine which develops more power at lower RPMS, which meets or exceeds OPEI safety standards.

1973:     First engineering prototype “F” engine run.

1974:     New fuel-and-governor system developed and tested

1975:     In May, first factory “die cast” engine tested.

1975:     In October, first units released for extensive field testing.

1977:     In October, full factory production began after two years of thorough and extensive testing.

This is not the end — rather, it is the beginning of a NEW GENERATION for us, the manufacturer, and you, the service dealer.

1983:     In July, after nine years of research and development, Lawn-Boy started producing compliance lawn mowers that feature two different blades-stopping systems: One is the blade, brake, clutch (BBC) system, which stops the blade within three seconds after the operator releases the ball. The engine continues to run with this system. The other is a flywheel brake system which stops both the blade and engine within three seconds after the operator releases the bail.

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