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Honda G50 Maintenance
| Engine Model: Honda G50 |
| Engine Type: 4-cycle 1-cylinder air-cooled horizontal shaft gasoline engine |
| Total Displacement: 11.4 cu.in (187 cc) |
| Rated Engine Power: 4.9 Hp (3.7 kW) at 4000 rpm |
| Fuel System: Horizontal carburetor with butterfly valve |
| Service Data |
Cylinder Bore Inside Diameter (Maximum), 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 |
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)
| Ignition System |
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
| Service Intervals |
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 Adjustment .............. Every 200 hours
Check and Adjust Idle Speed .............. Every 200 hours
Check and Adjust Valve Clearance .............. Every 200 hours
| Tightening Torques |
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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