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Unofficial Home of Old Simplicity & Allis-Chalmers Garden Tractors

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    Wonder-Boy Specifications



    Wonder -Boy 400 4HP (with 24" Rotary Mower)
    (Mfr. No. for Model 400 - 990234)


    ENGINE: 4-cycle, 6 hp, single cylinder, air cooled engine featuring "Easy-Spin" starting and equipped with large recoil starter, oil bath, air cleaner. Manual carburetor throttle control. Remote choke control.
    CLUTCH: "Soft-Action" belt clutch, with spring loaded idlers and special long wearing belts give superior performance.
    AXLE: Specially designed 2-speed rear axle gives 2 forward speeds and 2 reverse. Geared differential gives maximum durability. Pivoting front axle allows front wheel to ride over an 8" obstacle. Drag link equipped with ball joints makes handling easier.
    TIRES: Soft pneumatic stud-tread full tractor tires, 4.8Ox8 rear, 3.5Ox4 front, 2-ply.
    FRAME: Electrically welded steel. Center frame of heavy tubular steel.
    STEERING: Airplane type steering wheel.


    ENGINE: 4 hp, 4-cycle, Briggs & Stratton with mechanical governor, "Easy-Spin" starting, manual choke, recoil starter. Oil impregnated foam rubber air filter. Hood quickly removable for easy access.
    CLUTCH: Soft action, spring loaded idlers, extra long wearing belts.
    AXLE: 2-speed rear axle geared differential, offers maximum durability. Front axle allows front wheels to ride over 8" obstacle.
    STEERING: Controlled by airplane-type steering wheel.
    TIRES: Soft, pneumatic stud tread, 4.00 x 8 2-ply on rear. Front tires semi-pneumatic.
    FRAME: Heavy duty tubular steel, electrically welded.

    Source: 1962 Simplicity Lawn and Garden   Power Equipment product catalog, courtesy of John Boesch (loan of original)   and Steve Johnson (color photocopy)

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