The Honda GXV50 is a 49 cc, (2.99 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a vertical shaft, manufactured by Honda Motor Company for general-purpose applications.
Cylinder bore and piston stroke are 41.8 mm (1.65 in) and 36.0 mm (1.42 in), respectively. Compression ratio rating is 8.0:1.
This engine produced 2.4 PS (1.8 kW; 2.4 HP) at 7,000 rpm of horsepower and 3.04 N·m (0.3 kg·m, 2.2 ft·lb) at 4,500 rpm of torque.
The Honda GXV50 features:
- Overhead valve (OHV) design
- Transistorized magneto ignition system
- Horizontal type, butterfly valve carburetor
- Centrifugal governor
- Splash lubrication system
- Forced air cooling system
- Recoil or electric starter
General information
| Engine Specifications | |
| Engine model | GXV50 |
| Engine type | 4-stroke, OHV, single-cylinder |
| Displacement | 49 cm3, (2.99 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 | Horizontal type, butterfly valve carburetor |
| Fuel consumption | 250 g/HPh |
| Fuel tank capacity | 0.5 L (0.13 US. gal. 0.11 Imp. gal.) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Recoil or electric starter |
| Stoping system | Ignition primary circuit ground |
| Governor | Centrifugal governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 249 x 286 x 225 mm (9.8 x 11.3 x 8.9 in) |
| Dry weight | 5.2 kg (11.5 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 big end diameter (standard): | 15.000-15.011 mm (0.5906-0.591 in) |
| Connecting rod small end diameter (standard): | 10.006-10.007 mm (0.3939-0.394 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) |
| Crankshaft center distance: | 18 mm (0.71 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 |
| Valve cover bolt | 6 Nm; 0.6 kg·m; 4.3 ft·lb |
| Oil drain bolt | 11 Nm; 1.1 kg·m; 8 ft·lb |
| Flywheel nut | 21 Nm; 2.1 kg·m; 15 ft·lb |
| Fuel tank bolt | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Igniton coil bolt | 6 Nm; 0.6 kg·m; 4.3 ft·lb |
| Fan caver stud bolt | 6 Nm; 0.6 kg·m; 4.3 ft·lb |
| Governor arm nut | 7 Nm; 0.7 kg·m; 5.1 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: | 4,800 ± 150 rpm |
| Idle speed: | 2,500 ± 200 rpm |
| Cylinder compression: | 4.3 kg/cm2 (61.2 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: | Horizontal type, butterfly valve 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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