Honda G50 Specifications
| Engine Model: Honda G50 |
| Engine Type: 4-cycle 1-cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 11.4 cu.in (187 cc) |
| Rated Engine Power: 4.9 Hp (3.65 kW) at 4000 rpm |
| Carburetor Type: Horizontal with butterfly valve |
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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 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)
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 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)
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)
Cylinder Bore Inside Diameter (Max), in (mm) .............. 2.722 (69.055)
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)
Engine Oil Type (Summer) .............. SAE 10W-40
Engine Oil Type (Winter) .............. SAE 10W
API Service Classifications .............. SD or MS
Oil Capacity, qts (L) .............. 0.64 (0.60)
Spark Plug Type .............. NGK B6HS
Spark Plug Gap, in (mm) .............. 0.0236-0.0276 (0.60-0.70)
Thread Size, in (mm) .............. 0.47 (12.0)
Ignition Timing, deg .............. 20 BTDC
Check Engine Oil Level .............. Every 10 hours
Clean Air Filter Element .............. Every 50 hours
Check and Adjust Spark Plug .............. Every 50 hours
Change Engine Oil .............. Every 100 hours
Clean Fuel Strainer .............. Every 100 hours
Replace Spark Plug .............. Every 100 hours
Replace Air Filter Element .............. Every 200 hours
Check Carburetor Adjustments .............. Every 200 hours
Check and Adjust Idle Speed .............. Every 200 hours
Check and Adjust Valve Clearance .............. Every 200 hours
Cylinder Head (M10x1.25) .............. 20-24 Nm (14.5-17.4 ft-lb)
Flywheel (M20x1.5) .............. 80-90 Nm (57.9-65.1 ft-lb)
Carburetor (M6x1.0) .............. 10-12 Nm (7.2-8.7 ft-lb)
Muffler (M6x1.0) .............. 8-12 Nm (5.8-8.7 ft-lb)
Starter pulley (6x1.0) .............. 8-12 Nm (5.8-8.7 ft-lb)
Fuel cock (6x1.0) .............. 10-12 Nm (7.2-8.7 ft-lb)
PTO (8x1.25) .............. 20-24 Nm (14.5-17.4 ft-lb)
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