Compare/Simplicity 404 990390 vs Simplicity Wonder Boy II

Simplicity 404 990390 vs Simplicity Wonder Boy II

Verdict: Simplicity 404 990390 vs Simplicity Wonder Boy II

The Simplicity 404 990390 and the Simplicity Wonder Boy II are both lawn tractors — here is how they stack up on the figures that matter. Both are rated at the same 4 hp. Simplicity 404 990390 is the newer design (1967 vs 1958). Use the full side-by-side spec tables below to weigh the details against your own operation, and confirm with a dealer demo.

Tune the fit score

Tell us about your operation

Acreage600 acBudgetMain crop / use

Fit & specs

Simplicity

Fit score

Best match

Clear

Simplicity

Fit score

Best match

Clear

Rated power

4 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

Simplicity (a part of Allis Chalmers)Reference

SimplicityReference

Image courtesy of Jeremy LinkowskiReference

air-cooledReference

Engine

Displacement

10.4 ciReference

10.2 ciReference

Bore/Stroke

64 x 54 mmReference

63 x 54 mmReference

Power (gross)

3.0 kWReference

—

Starter type

manual recoilReference

electricReference

Power

—

3.0 kWReference

Transmission

Gears

2 forward and 1 reverseReference

2 forward and reverseReference

Transmission

—

DuomaticReference

Dimensions

Weight

27 kgReference

—

Front tire

10x2.75Reference

10x2.50Reference

Rear tire

13x5.00-6Reference

4.00x8Reference

Lawn/turf front

10x2.75Reference

10x2.50Reference

Lawn/turf rear

13x5.00-6Reference

4.00x8Reference

Shipping weight

107 kgReference

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Simplicity 404 attachments

Attachment overview

24" Mower deck

Type

belt-driven gearReference

Cutting width

60 cmReference

Cut height

4 to 6 cmReference

3 to 8 cmReference

Variants

990119

—

manual startReference

990120

—

electric startReference

Simplicity Wonder Boy II attachments

Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.