Compare/Wheel Horse 312-H vs Wheel Horse C-121

Wheel Horse 312-H vs Wheel Horse C-121

Verdict: Wheel Horse 312-H vs Wheel Horse C-121

The Wheel Horse 312-H and the Wheel Horse C-121 are both lawn tractors — here is how they stack up on the figures that matter. Both are rated at the same 12 hp. Wheel Horse 312-H is the lighter machine (282 kg vs 600 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Wheel Horse C-121 holds more fuel (11.4 L vs 6.6 L) for longer stints between fills. Wheel Horse 312-H is the newer design (1990 vs 1978). 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

Wheel Horse

Fit score

Best match

Clear

Wheel Horse

Fit score

Best match

Clear

Rated power

12 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

Wheel Horse (a part of Toro)Reference

SundstrandReference

air-cooled horizontal-shaftReference

Image courtesy of Arthur AndersenReference

Original price

—

$2,310 (1978 hydro )Reference

Engine

Fuel tank

6.6 LReference

11.4 LReference

Displacement

29.07 ciReference

Bore/Stroke

86 x 83 mmReference

Power (gross)

8.9 kWReference

Rated RPM

3600Reference

3400Reference

Starter

electricReference

Starter volts

12Reference

Oil capacity

2.4 LReference

5.2 LReference

Sparkplug

RH10Reference

—

Sparkplug gap

0.635 mmReference

Point gap

—

0.508 mmReference

Transmission

Eaton 1100-032Reference

Wheel Horse 103916Reference

Type

belt-driven hydrostaticReference

Gears

infinite forward and reverseReference

Gear Weight

—

272 kgReference

Dimensions

Wheelbase

115 cmReference

Weight

282 kgReference

600 to 630 poundsReference

Front tire

15x6.00-6Reference

16x6.50-8Reference

Rear tire

23x8.50-12Reference

Lawn/turf front

15x6.00-6Reference

16x6.50-8Reference

Lawn/turf rear

23x8.50-12Reference

Length

165 cmReference

Width

92 cmReference

91 cmReference

Height

107 cmReference

104 cmReference

Hydro Weight

—

285 kgReference

312-H Serial Numbers

1990

-unknown-Reference

—

1991

-unknown-Reference

—

1992

-unknown-Reference

—

Location:

Serial number plate on rear fender, below the seat. Model codes in parentheses.Reference

Serial number plate below the dashboard. Tractor model codes shown.Reference

Electrical

Ground

negativeReference

Charging amps

15Reference

Battery CCA

160Reference

—

Battery volts

12Reference

Attachment overview

PTO & Hydraulics

Mid PTO

—

independentReference

Clutch

—

manual dry discReference

Mid PTO Type

—

pulleyReference

C-121 Serial Numbers

1978

—

81-12KS01 (hydro)Reference

1979

—

81-12KS01 (hydro)Reference

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.