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Lawn Tractor · 1957Unverified
Simplicity Wonder Boy
Simplicity Wonder Boy — Wonder Boy Series · 4 hp. Reference specifications; pending source verification.
The Simplicity Wonder Boy is a compact lawn tractor with a rated output of 4 hp, produced in 1957. It features a 1-cylinder petrol air-cooled engine and a 1-speed two-wheel drive gearbox. The Wonder Boy is designed for use on areas up to 200 acres. Specifications for the UK and US models are available.
Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.
Rated power
4 hp
Catalogue coverage
Variants represented
2
Richest spec table
35 rows
Recorded power
4 hp
Transmissions
1-speed gear
Production years
1957-1957
Verified variants
0
No linked source document is currently displayed; verify critical figures with the manufacturer or dealer.
Hover a source tag to verify
Overview
ManufacturerSimplicityReference
Riding lawn mowerReference
Built in Port Washington, Wisconsin, USAReference
Original price was $340 in 1957Reference
Two-wheel driveReference
Manual steeringReference
Open operator station.Reference
Variants
990086manual startReference
990102electric startReference
Engine
3.6HP Clinton 167cc 1-cyl gasolineReference
Clinton 1200Reference
gasolineReference
1-cylinderReference
air-cooledReference
Displacement10.2 ciReference
Bore/Stroke63 x 54 mmReference
Power2.7 kWReference
Starter typemanual recoilReference
Starter typeelectricReference
Transmission
1-speed gearReference
Typebelt-driven gearReference
Gears1 forward and reverseReference
Clutchmechanical idler pulleyReference
Dimensions
Front tire10x2.50Reference
Rear tire4.00x8Reference
Lawn/turf front10x2.50Reference
Lawn/turf rear4.00x8Reference
Simplicity Wonder Boy attachments
24" mid-mount mower deckReference
bladeReference
Attachment overview
24" mid-mount mower deckReference
BladeReference
24" Mower deck
Typemid-mount SimplicityReference
Type1-bladeReference
Cutting width60 cmReference
Cut height3 to 8 cmReference
Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.
