Lawn-Boy began manufacturing its brand of electricity mowers from the first 1950s. Since that time, the machines have already touted engines created by Lawn-Boy, Briggs & Stratton along with other producers. Early Lawn-Boy motors were equipped with a coil; within later years, solid state ignition technology replaced the coil with electronics. This new technique also required a clearance or air gap to be set so the motor starts correctly. Lawn-boy recommends utilizing the Lawn-Boy atmosphere gap gauge to place clearance gaps at 0.010 inch. The part number for the gauge is 604659. If you don’t have this gauge, you can use a feeler gauge of the depth made by any producer.
D-400 Series Engines With Coils
Lawn-Boy D-400 string engines are two-cycle engines with a “twin spark” ignition program. The first spark starts the motor, and a second spark keeps the motor running. The D-400 motors are equipped with a ignition coil. Lawn-Boy recommends putting the clearance, also referred to as the air gap, between the coil and flywheel at 0.010 inch. Lawn-Boy 7260 string mower versions, made in the 1970s and 1980s, are equipped with Lawn-Boy brand engines in the D-400 collection, specifically the D408 and D409.
D-600 Series Engines With no Coils
In 1972 Lawn-Boy began manufacturing coil-less, solid-state ignition systems on its D-600 string engines. On the engines the atmosphere gap is put between the flywheel and the capacitor release module at 0.010 inch. Lawn-Boy versions 5270 and 5271 are both equipped with Lawn-Boy brand D600 engines. Models 5272 through 5275 possess the D601 engine. These engines were created from 1972 to 1978.
F-Series Engines Without Coils
In 1977 Lawn-Boy began producing its F-series of all two-cycle engines. It comprises 21 fewer parts than previous engines, and the manufacturer claims it creates more electricity compared to the 400 series or 600 series. The F-series of motors utilize the solid-state ignition program. The clearance setting is 0.010 inch between the flywheel and capacitor discharge module. Lawn-Boy versions in the 0292 series, made in 1980 to 1982, have F210 and F211 engines. Models in the 0392 string, created from 1980 to 1982, are equipped with F250 and F251 engines.
Briggs & Stratton Engines
If your Lawn-Boy mower includes a Briggs & Stratton engine, the clearance has to be set according to this atmosphere gap Briggs & Stratton recommends. Typical settings are between 0.006 to 0.010 and 0.010 to 0.014 inch. The exact setting is recorded in the owner’s manual that came with the motor. The clearance setting for Briggs & Stratton 110000 series engines, found on Lawn-Boy versions 397 and 427, is 0.006 to 0.010. For motors from the 130000 and 190000 string, on the Lawn-Boy versions 2650 and 2580 respectively, the clearance setting is 0.010 to 0.014.