The Honda GXH50 is a 49 cc (3.0 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion gasoline engine with a horizontal shaft, manufactured by Honda Motor Company for general-purpose applications.
It has an 41.8 mm (1.65 in) cylinder bore and 36.0 mm (1.42 in) piston stroke. The compression ratio rating is 8.0:1.
The GXH50 engine produced 2.4 PS (1.8 kW; 2.4 HP) at 7,000 rpm of maximum horsepower and 3.04 N·m (0.3 kg·m, 2.2 ft·lb) at 4,500 rpm of maximum torque.
The Honda GXH50 features:
- OHV design
- Transistorized magneto ignition system
- Float type carburetor
- Centrifugal governor
- Splash lubrication system
- Forced air cooling system
- Recoil starter
General information
| Engine Specifications | |
| Engine model | GXH50 |
| Engine type | 4-stroke, OHV, single-cylinder |
| Displacement | 49 cm3, (3.0 cu·in) |
| Max. horsepower | 2.4 PS (1.8 kW; 2.4 HP) at 7,000 rpm |
| Max. torque | 3.04 N·m (0.3 kg·m, 2.2 ft·lb) at 4,500 rpm |
| Cooling system | Forced air |
| Air cleaner | Semi-dry type |
| Lubricating system | Splash |
| Ignition system | Transistorized magneto ignition |
| Fuel system | Float type carburetor |
| Fuel consumption | 240 g/HPh |
| Fuel tank capacity | 0.77 L (0.2 US. gal. 0.17 Imp. gal.) 1.2 L (0.32 US. gal, 0.26 Imp. gal.) |
| Starting system | Recoil starter |
| Stoping system | Ignition primary circuit ground |
| Governor | Centrifugal governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 225 x 274 x 353 mm (8.9 x 10.8 x 13.9 in) |
| Dry weight | 5.5 kg (12.1 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 8.0:1 |
| Cylinder bore: | 41.8 mm (1.65 in) |
| Piston stroke: | 36.0 mm (1.42 in) |
| Cylinder internal diameter (standard): | 41.800-41.815 mm (1.6457-1.6463 in) |
| Piston skirt outer diameter (standard): | 41.770-41.790 mm (1.6445-1.6453 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod small end diameter (standard): | 10.006-10.007 mm (0.3939-0.394 in) |
| Connecting rod center distance: | 15.000-15.011 mm (0.5906-0.591 in) |
| Side clearance (Top): | 0.015-0.050 mm (0.0006-0.002 in) |
| Side clearance (Second): | 0.015-0.050 mm (0.0006-0.002 in) |
| Ring end gap (Top): | 0.150-0.300 mm (0.0059-0.0118 in) |
| Ring end gap (Second): | 0.150-0.300 mm (0.0059-0.0118 in) |
| Ring width (Top): | 0.770-0.790 mm (0.0303-0.0311 in) |
| Ring width (Second): | 0.970-0.990 mm (0.0382-0.039 in) |
| Crankpin journal diameter: | 14.973-14.984 mm (0.5895-0.5899 in) |
| Cylinder head | |
| Valve arrangement: | OHV, gear driven |
| Valves: | 2 |
| Valve steam diameter (INTAKE): | 3.970-3.985 mm (0.1563-0.1569 in) |
| Valve steam diameter (EXHAUST): | 3.935-3.950 mm (0.1549-0.1555 in) |
| Valve spring free length (INTAKE): | 23.7 mm (0.9331 in) |
| Valve spring free length (EXHAUST): | 23.7 mm (0.9331 in) |
| Camshaft lobe height (INTAKE): | 27.972 mm (1.1013 in) |
| Camshaft lobe height (EXHAUST): | 27.972 mm (1.1013 in) |
Tightening torque specs
| Tightening torque specs | |
| Spark plug | 12 Nm; 1.2 kg·m; 8.6 ft·lb |
| Connecting rod bolt | 6 Nm; 0.6 kg·m; 4.3 ft·lb |
| Crankcase cover bolt | 7.5 Nm; 0.75 kg·m; 5.4 ft·lb |
| Oil case bolt | 7.5 Nm; 0.75 kg·m; 5.4 ft·lb |
| Flywheel nut | 22 Nm; 2.2 kg·m; 16 ft·lb |
| Igniton coil bolt | 6 Nm; 0.6 kg·m; 5 ft·lb |
| Carburetor drain screw | 1.2 Nm; 0.12 kg·m; 0.9 ft·lb |
| Carburetor drain bolt | 4.5 Nm; 0.45 kg·m; 3.3 ft·lb |
| Others | |
| 4 mm bolts, nuts | 3.5 Nm; 0.35 kg·m; 2.5 ft·lb |
| 5 mm bolts, nuts | 5.5 Nm; 0.55 kg·m; 4.0 ft·lb |
| 6 mm bolts, nuts | 10 Nm; 1.0 kg·m; 7 ft·lb |
Service Data
| Engine | |
| Maximum speed: | 7,800 ± 150 rpm |
| Idle speed: | 2,500 ± 20 rpm |
| Cylinder compression: | 4.3 kg/cm2 (61 psi) at 1,000 rpm |
| Valve clearance | |
| Intake valve clearance: | 0.06-0.10 mm (0.0024-0.0039 in) |
| Exhaust valve clearance: | 0.09-0.13 mm (0.0035-0.0051 in) |
| Oil system | |
| Lubrication system: | Splash |
| Oil type: | Honda 4-stroke or an equivalent (SE or SF) |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | 0.25 L (0.26 US. qt, 0.22 Imp. qt.) |
| Fuel system | |
| Type: | Float type carburetor |
| Main jet: | #55 |
| Float height: | 12.0 mm (0.4724 in) |
| Pilot screw opening: | 1-1/8 turns out |
| Ignition system | |
| Type: | Transistorized magneto ignition |
| Ignition timing: | 30° B.T.D.C. |
| Spark plug: | NGK: CR5HSB DENSO: U16FSR-UB |
| Spark plug gap: | 0.6-0.7 mm (0.0236-0.0276 in) |
| Spark plug torque: | 12 N·m (1.2 kg·m, 8.8 ft·lb) |
| Ignition coil air gap | 0.3-0.5 mm (0.0118-0.0197 in) |
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