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Honda GX120 QXS2 Horizontal Engine

The Honda GX120 QXS2 Horizontal Engine is a specialized commercial-grade power unit designed for equipment that requires both mechanical power and an auxiliary electrical supply. Its built-in 12V/50W lamp coil can power compatible lights or laser-guidance systems, making it well suited to pavement stripers, paint sprayers, concrete screeds, and similar professional equipment.

Key Specifications

Specification Details
Brand Honda
Model GX120 QXS2
Current manufacturer model GX120UT3QXS2
Engine type Air-cooled, four-stroke, single-cylinder OHV
Shaft orientation Horizontal
Crankshaft type Q-type straight shaft
Shaft diameter 3/4″
Shaft length 2.43″ / approximately 2-27/64″
Keyway 3/16″
End tap 5/16″-24
Lamp coil 12V/50W
Muffler Included, low-profile configuration
Displacement 122cc
Bore × stroke 60 × 43.5 mm
Net power 3.2 HP (2.4 kW) at 3,600 rpm
Maximum net torque 5.5 lb-ft (7.3 Nm) at 2,500 rpm
Compression ratio 8.3:1
Starting system Heavy-duty recoil starter
Ignition Transistorized magneto
Carburetor Butterfly-float type
Governor Centrifugal mechanical
Lubrication Splash
Oil capacity 0.59 US qt / 0.56 liter
Low-oil protection Oil Alert with automatic shutdown
Air cleaner Dual-element
Fuel Unleaded gasoline, 86 octane or higher
Fuel-tank capacity 2.1 US qt / 2.0 liters
PTO rotation Counterclockwise from PTO side
Throttle control Remote-wire compatible
Dimensions Approximately 297 × 346 × 329 mm
Dry weight Approximately 28.9 lb / 13.2 kg
CARB approved Yes for the UT3 configuration

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