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) |
We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.
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