Simplicity 404 990390

The Simplicity 404 990390 is a tractor produced by Simplicity Lawn Tractors. It is equipped with a 170 cc 10.4 ci engine. The listed engine power is Gasoline (gross): 4 hp / 3.0 kW. Transmission: 2 forward and 1 reverse. Operating weight: 60 lbs 27 kg.

Overview

	1967 - 1968 Wonder Boy SeriesRiding lawn mower Wonder Boy Series Riding lawn mower

Production
Manufacturer	Simplicity (a part of Allis Chalmers)
Riding lawn mower
Built in Port Washington, Wisconsin, USA
Original price was $280 in 1967

Simplicity 404 Engine
4HP Briggs & Stratton 170cc 1-cyl gasoline
Engine details ...

Simplicity 404 Transmission
2-speed gear
Transmission details ...

Mechanical
Two-wheel drive
Manual steering
Open operator station.

Dimensions & Tires
Weight	237 lbs 107 kg
Front tire	10x2.75
Rear tire	13x5.00-6
Full dimensions and tires ...

References
the new look of Simplicity action '67 published in 1967
Improve your lot in life published in 1968, by Simplicity

Engine

Engine Detail — 170 cc / 10.4 ci Gasoline

Manufacturer	Briggs & Stratton 100000
Fuel Type	Gasoline
Configuration	1-cylinder, air-cooled
Displacement	170 cc 10.4 ci
Bore/Stroke	2.50x2.125 inches 64 x 54 mm
Power (gross)	4 hp 3.0 kW
Starter type	manual recoil

Simplicity 404 Engine
Image courtesy of Jeremy Linkowski

Transmission

Transmission — 2 forward and 1 reverse belt-driven gear

Type	belt-driven gear
Gears	2 forward and 1 reverse

Dimensions

Simplicity 404 Tires
Lawn/turf front	10x2.75
Lawn/turf rear	13x5.00-6

Dimensions
Shipping weight	237 lbs 107 kg

Attachments

Attachment overview
24" mid-mount mower deck
Blade

24" Mower deck
Type	mid-mount Simplicity 990358
	1-blade
Cutting width	24 inches 60 cm
Weight	60 lbs 27 kg
Cut height	1.625 to 2.75 inch 4 to 6 cm

Photos

1967 Simplicity Wonder Boy 404, front-left.

1967 Simplicity Wonder Boy 404, left side.