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Home / Small Engines / Honda Engines / Honda GXV120

Honda GXV120 Specifications

Engine Model: Honda GXV120

Engine Type: 4-cycle 1-cylinder air-cooled gasoline engine

Total Displacement: 7.2 cu.in (118 cc)

Rated Engine Power: 4.0 Hp (2.9 kW) at 3600 rpm

Carburetor Type: Horizontal, butterfly valve

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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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