The Honda GS65 is a 240 cc, (14.6 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Honda Motor Company since 1975 for general-purpose applications.
The cylinder bore is 72.0 mm (2.83 in) and the piston stroke is 59.0 mm (2.32 in). The compression ratio rating is 6.1:1.
This engine produced 6.8 PS (5.0 kW; 6.7 HP) at 4,000 rpm of horsepower and 12.0 N·m (1.2 kg·m, 8.8 ft·lb) at 3,000 rpm of torque.
The Honda GS65 features:
- Slide valve (L-head) design
- High voltage ignition system
- Horizontal type carburetor with butterfly valve
- Centrifugal governor
- Splash type lubrication system
- Forced air cooling system
- Electric starter
General information
| Engine Specifications | |
| Engine model | GS65 |
| Engine type | 4-stroke, L-head, single-cylinder |
| Displacement | 240 cm3, (14.6 cu·in) |
| Max. horsepower | 6.8 PS (5.0 kW; 6.7 HP) at 4,000 rpm |
| Max. torque | 12.0 N·m (1.2 kg·m, 8.8 ft·lb) at 3,000 rpm |
| Cooling system | Forced air |
| Air cleaner | – |
| Lubricating system | Splash system |
| Ignition system | High voltage ignition |
| Fuel system | Horizontal type carburetor with butterfly valve |
| Fuel consumption | 300 g/HPh |
| Fuel tank capacity | 6.9 L (1.82 US. gal. 1.52 Imp. gal.) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Electric starter |
| Stoping system | Ground switch |
| Governor | Centrifugal governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | – |
| Dry weight | – |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 6.1:1 |
| Cylinder bore: | 72.0 mm (2.83 in) |
| Piston stroke: | 59.0 mm (2.32 in) |
| Cylinder internal diameter (standard): | 72.00 mm (2.8346 in) |
| Piston skirt outer diameter (standard): | 71.97 mm (2.8335 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Side clearance (Top): | 0.020 mm (0.0008 in) |
| Side clearance (Second): | 0.010 mm (0.0004 in) |
| Side clearance (Oil): | 0.010 mm (0.0004 in) |
| Ring width (Top): | 2.480 mm (0.0976 in) |
| Ring width (Second): | 2.490 mm (0.098 in) |
| Ring width (Oil): | 2.490 mm (0.098 in) |
| Crankshaft center distance: | 29.5 mm (1.16 in) |
| Cylinder head | |
| Valve arrangement: | Slide valve (L-head) |
| Valves: | 2 |
| Valve steam diameter (INTAKE): | 6.970 mm (0.2744 in) |
| Valve steam diameter (EXHAUST): | 6.930 mm (0.2728 in) |
| Camshaft lobe height (INTAKE): | 35.180 mm (1.385 in) |
| Camshaft lobe height (EXHAUST): | 35.180 mm (1.385 in) |
Tightening torque
| Tightening torque specs | |
| Fuel tank (8 mm nut, bolt) | 20-28 Nm; 2.0-2.8 kg·m; 14.5-20.2 ft·lb |
| Side cover (8 mm bolt) | 20-25 Nm; 2.0-2.5 kg·m; 14.5-18.1 ft·lb |
| Cylinder Head (8 mm bolt) | 20-25 Nm; 2.0-2.5 kg·m; 14.5-18.1 ft·lb |
| Cylinder (6 mm bolt) | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
| Cylinder (8 mm bolt) | 20-28 Nm; 2.0-2.8 kg·m; 14.5-20.2 ft·lb |
| Camshaft center (6 mm bolt) | 10-15 Nm; 1.0-1.5 kg·m; 7.2-10.8 ft·lb |
| Starter pulley (6 mm bolt) | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
| Flywheel (17 mm nut) | 70-80 Nm; 7.0-8.0 kg·m; 50.6-57.9 ft·lb |
| Muffler (6 mm nut) | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
| Carburetor (6 mm nut) | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
Service Data
| Cylinder compression: | 4.0 kg/cm2 at 450-600 rpm |
| Valve clearance | |
| Intake valve clearance: | 0.06-0.11 mm (0.0024-0.0043 in) |
| Exhaust valve clearance: | 0.06-0.11 mm (0.0024-0.0043 in) |
| Oil system | |
| Lubrication system: | Splash system |
| Oil type: | Honda 4-stroke or an equivalent (SG, SF) |
| Recommended oil: | SAE 10W-30, 10W-40 |
| Oil capacity: | 0.82 L (0.87 US. qt, 0.72 Imp. qt.) |
| Ignition system | |
| Type: | High voltage ignition |
| Ignition timing: | 25° B.T.D.C (Fixed) |
| Spark plug: | NGK BR6HS, B6HS |
| Spark plug gap: | 0.6-0.7 mm (0.0236-0.0276 in) |
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