Honda GX120 Owner's Manual and Product Specification

Honda GX120 Owner's Manual was published to help user or technician to get the best results from your new engine and to operate it safely. This owner's manual contains important information and explanation on how to do that. Honda as the manufacturer recommends you to read this manual carefully before operating the engine. If you encounter the problems, you can refer to troubleshooting guide is useful, both for user and technician. You can also consult an authorized Honda servicing dealer.

This manual should be considered a permanent part of the engine and should remain with the engine if resold. Review the instructions provided with the equipment powered by this engine for any additional information regarding engine start-up, shutdown, operation, adjustments or any special maintenance operations.

Honda GX120 Product Specification
Engine Type
Air-cooled 4-stroke OHV
Bore x Stroke
60 X 42 mm
118 cm3
Net Power Output*
3.5 HP (2.6 kW) @ 3,600 rpm
Net Torque
5.4 lb-ft (7.3 Nm) @ 2,500 rpm
PTO Shaft Rotation
Counterclockwise (from PTO shaft side)
Compression Ratio
Lamp/Charge coil options
25W, 50W
Ignition System
Transistorized magneto
Starting System
Lubrication System
Governor System
Air cleaner
Dual Element
Oil Capacity
0.59 US qt. (0.56 L)
Fuel Tank Capacity
2.1 U.S. qts (2.0 liters)
Unleaded 86 octane or higher
Dry Weight
29 lbs. (13.0 kg)

Length (min)
11.7” (297 mm)

Width (min)
13.6” (346 mm)

Height (min)
13.0” (329 mm)

If you are looking for Honda GX120 Owner's Manual, please download it from their official website that the link is below.

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