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Honda G50 Specifications
The Honda G50 is a 187 cc (11.4 cubic inches) 4-cycle 1-cylinder air-coolled internal combustion small gasoline engine manufactured by Honda
Motor Company or general-purpose applications.
The Honda G50 engine has a slide valve (L-head) design and camshaft driven by a single row chain driven by the crankshaft. It has a recoil starter,
horizontal carburetor with butterfly valve and high voltage ignition.
Cylinder bore and piston stroke are 69.0 mm (2.7 in) and 50.0 mm (2.0 in). Compression ratio rating is 6.5:1 for G50K1 and 6.9:1 for G50K2.
The G50 produced 3.8 PS (2.8 kW) at 3600 rpm of continuous rated power and 5.0 PS (3.67 kW) at 4000 rpm of maximum power. The Honda G50
produced 9.0 Nm (0.85 kgm) at 3600 rpm of torque.
| General Technical Data |
Engine Model .............. Honda G50
Engine Type .............. 4-cycle single-cylinder air-cooled horizontal shaft small gasoline engine
Number of Cylinders .............. 1
Displacement, cu.in (cc) .............. 11.41 (187)
Cylinder Bore, in (mm) .............. 2.72 (69.0)
Piston Stroke, in (mm) .............. 1.97 (50.0)
Rated Engine Power, hp (kW) .............. 4.9 (3.65)
Rated Engine Speed, rpm .............. 4000
Maximum Torque, Nm (ft-lbs) .............. 9.0 (6.6)
Torque Speed, rpm .............. 3600
Compression Ratio .............. 6.5:1
PTO Shaft Rotation .............. Counterclockwise (from PTO shaft side)
Valve Arrangement .............. L-head
Lubrication System .............. Splash type
Air Cleaner .............. Oil bath
Cooling System .............. Forced air
Ignition System .............. High voltage
Starter Type .............. Recoil
| Fuel System |
Fuel System Type .............. Carburetor
Carburetor Type .............. Horizontal with butterfly valve
Governor Type .............. Centrifugal
Fuel Tank Capacity, qts (L) .............. 3.6 (3.4)
Fuel Type .............. Gasoline (86 or higher)
| Dimensions and Weight |
Overall Length, in (mm) .............. 16.7 (425)
Overall Width, in (mm) .............. 12.8 (325)
Overall Height, in (mm) .............. 16.9 (430)
Dry Weight, lbs (kg) .............. 41.8 (19.0)
| Cylinder Block |
Cylinder Compression, psi (kPa) .............. 100.0 (690)
Cylinder Bore Inside Diameter (Std), in (mm) .............. 2.7165 (69.00)
Cylinder Bore Inside Diameter (Wear Limit), in (mm) .............. 2.722 (69.055)
Piston Skirt Outside Diameter, in (mm) .............. 2.7153-2.7161 (68.97-68.99)
Connecting Rod Small End Diameter (Std), in (mm) .............. 0.7091-0.7098 (18.01-18.03)
Top Ring Groove Side Clearance, in (mm) .............. 0.0008-0.0024 (0.02-0.06)
Second Ring Groove Side Clearance, in (mm) .............. 0.0008-0.0024 (0.02-0.06)
Oil Ring Groove Side Clearance, in (mm) .............. 0.0008-0.0024 (0.02-0.06)
Top Ring End Gap, in (mm) .............. 0.0079-0.0157 (0.20-0.40)
Second Ring End Gap, in (mm) .............. 0.0079-0.0157 (0.20-0.40)
Oil Ring End Gap, in (mm) .............. 0.0079-0.0157 (0.20-0.40)
| Cylinder Head and Valves |
Number of Valves .............. 2
Cylinder Head (Max Out of Flatness), in (mm) .............. 0.002 (0.05)
Intake Valve Clearance, in (mm) .............. 0.0028 (0.007)
Exhaust Valve Clearance, in (mm) .............. 0.0028 (0.007)
Intake Valve Stem Diameter, in (mm) .............. 0.2744 (6.97)
Exhaust Valve Stem Diameter, in (mm) .............. 0.2726 (6.925)
Valve Spring Free Length, in (mm) .............. 1.0984 (27.90)
Camshaft Journal Diameter, in (mm) .............. 0.4711-0.4718 (11.966-11.984)
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