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Honda GXV120 Specifications
The Honda GXV120 is a 118 cc (7.2 cubic inches) one-cylinder air-cooled four-stroke internal combustion small gasoline engine with vertical shaft
manufactured by Honda Motor Company for general-purpose applications, such as lawn mowers, commercial lawn and garden equipment, forestry
equipment, construction and industrial equipment, agricultural equipment.
The Honda GXV120 engine has an OHV (overhead valve) design, horizontal type carburetor with butterfly valve, centrifugal mechanical governor,
heavy-duty recoil or electric starter, and transistorized magneto ignition system.
The cylinder bore is 60.0 mm (2.4 in) and the piston stroke is 42.0 mm (1.7 in), compression ratio rating is 8.0:1 or 8.7:1. The engine produced 4.0
HP (2.9 kW) of power at 3,600 rpm and 8.0 Nm (0.82 kgm, 5.92 ft-lb) of torque at 2,700 rpm.
| General Technical Data |
Engine Model .............. Honda GXV-120
Engine Type .............. 4-cycle overhead valve 1-cylinder air-cooled small gasoline engine
Number of Cylinders .............. Single
Displacement, cu.in (cc) .............. 7.2 (118)
Cylinder Bore, in (mm) .............. 2.36 (60.0)
Piston Stroke, in (mm) .............. 1.65 (42.0)
Rated Engine Power, hp (kW) .............. 4.0 (2.9)
Rated Engine Speed, rpm .............. 3600
Maximum Torque, Nm (ft-lbs) .............. 8.1 (5.92)
Torque Speed, rpm .............. 2700
Compression Ratio .............. 8.7:1/8.0:1
Valve Arrangement .............. OHV
PTO Shaft Rotation .............. Counterclockwise (from PTO side)
Lubrication System .............. Forced splash type
Air Cleaner Type .............. Dual dry element
Cooling System .............. Forced air
Ignition System .............. Transistorized magneto
Stopping System .............. Primary circuit ground
Starting System .............. Recoil starter
| Fuel System |
Fuel System Type .............. Carburetor
Carburetor Type .............. Horizontal, butterfly valve
Governor Type .............. Mechanical centrifugal
Fuel Tank Capacity, qts (L) .............. 1.1 (1.0)
Fuel Type .............. Gasoline (86 or higher)
| Dimensions and Weight |
Overall Length, in (mm) .............. 14.8 (375)
Overall Width, in (mm) .............. 13.0 (330)
Overall Height, in (mm) .............. 13.2 (335)
Dry Weight, lbs (kg) .............. 22.6 (12.5)
| Cylinder Block |
Cylinder Bore Inside Diameter (Std), in (mm) .............. 2.3622-2.3628 (60.000-60.015)
Cylinder Bore Inside Diameter (Wear Limit), in (mm) .............. 2.3687 (60.165)
Connecting Rod Small End Inside Diameter (Std), in (mm) .............. 0.512-0.513 (13.01-13.02)
Connecting Rod Small End Inside Diameter (Wear Limit), in (mm) .............. 0.515 (13.07)
Connecting Rod Big End Inside Diameter (Std), in (mm) .............. 1.0244-1.0249 (26.020-26.033)
Connecting Rod Big End Inside Diameter (Wear Limit), in (mm) .............. 1.026 (26.066)
Connecting Rod Big End Oil Clearance, in (mm) .............. 0.0016-0.0025 (0.040-0.063)
Crank Pin Outside Diameter (Std), in (mm) .............. 1.0224-1.0228 (25.970-25.980)
Crank Pin Outside Diameter (Wear Limit), in (mm) .............. 1.020 (25.92)
| Cylinder Head and Valves |
Number of Valves .............. 2
Cylinder Head (Max Out of Flatness), in (mm) .............. 0.004 (0.10)
Intake Valve Clearance, in (mm) .............. 0.005-0.007 (0.13-0.17)
Exhaust Valve Clearance, in (mm) .............. 0.007-0.009 (0.18-0.22)
Intake Valve Stem Outside Diameter (Std), in (mm) .............. 0.2153-0.2157 (5.468-5.480)
Intake Valve Stem Outside Diameter (Wear Limit), in (mm) .............. 0.2094 (5.318)
Exhaust Valve Stem Outside Diameter (Std), in (mm) .............. 0.2136-0.2146 (5.425-5.450)
Exhaust Valve Stem Outside Diameter (Wear Limit), in (mm) .............. 0.2077 (5.275)
Intake Valve Guide Inside Diameter, in (mm) .............. 0.2165-0.2170 (5.500-5.512)
Exhaust Valve Guide Inside Diameter, in (mm) .............. 0.2165-0.2170 (5.500-5.512)
Intake Valve Guide To Stem Clearance, in (mm) .............. 0.0008-0.0017 (0.020-0.044)
Exhaust Valve Guide To Stem Clearance, in (mm) .............. 0.0020-0.0030 (0.050-0.077)
Valve Seat Width (Intake/Exhaust), in (mm) .............. 0.08 (0.32)
Valve Spring Free Length, in (mm) .............. 1.339 (34.00)
Cam Height (Intake), in (mm) .............. 1.091 (27.700)
Cam Height (Exhaust), in (mm) .............. 1.093 (27.750)
Camshaft Outside Diameter (Std), in (mm) .............. 0.5498-0.5506 (13.966-13.984)
Camshaft Outside Diameter (Wear Limit), in (mm) .............. 0.5479 (13.916)
| Piston and Piston Rings |
Piston Pin Bore Inside Diameter (Std), in (mm) .............. 0.5119-0.5121 (13.002-13.008)
Piston Pin Bore Inside Diameter (Wear Limit), in (mm) .............. 0.5137 (13.048)
Piston Skirt Outside Diameter, in (mm) .............. 2.3608-2.3616 (59.965-59.985)
Piston to Cylinder Bore Clearance, in (mm) .............. 0.0006-0.0020 (0.015-0.050)
Piston Pin Outside Diameter (Std), in (mm) .............. 0.5116-0.5118 (12.994-13.000)
Piston Pin Outside Diameter (Wear Limit), in (mm) .............. 0.5100 (12.954)
Top Ring Width, in (mm) .............. 0.059 (1.50)
Second Ring Width, in (mm) .............. 0.059 (1.50)
Oil Ring Width, in (mm) .............. 0.098 (2.50)
Top Ring Groove Side Clearance, in (mm) .............. 0.0006-0.0018 (0.015-0.045)
Second Ring Groove Side Clearance, in (mm) .............. 0.0006-0.0018 (0.015-0.045)
Oil Ring Groove Side Clearance, in (mm) .............. 0.0006-0.0018 (0.015-0.045)
Top Ring End Gap, in (mm) .............. 0.008-0.016 (0.20-0.40)
Second Ring End Gap, in (mm) .............. 0.008-0.016 (0.20-0.40)
Oil Ring End Gap, in (mm) .............. 0.006-0.014 (0.15-0.35)
Ring End Gap (Wear Limit), in (mm) .............. 0.04 (1.00)
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