The Honda GP160H is a 163 cc (9.95 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Honda Motor Company for general-purpose applications.
The cylinder bore is 68.0 mm (2.68 in) and the piston stroke is 45.0 mm (1.77 in). The compression ratio rating is 8.5:1.
This engine produced 4.9 PS (3.6 kW; 4.8 HP) at 3,600 rpm of horsepower and 10.3 N·m (1.1 kg·m, 7.6 ft·lb) at 2,500 rpm of torque.
The Honda GP160 features:
- OHV design
- Transistorized magneto ignition system
- Horizontal type carburetor with butterfly valve
- Centrifugal governor
- Splash lubrication system
- Forced air cooling system
- Recoil starter
General information
| Engine Specifications | |
| Engine model | GP160H |
| Engine type | 4-stroke, OHV, single-cylinder, inclined by 25° |
| Displacement | 163 cm3, (9.95 cu·in) |
| Max. horsepower | 4.9 PS (3.6 kW; 4.8 HP) at 3,600 rpm |
| Max. torque | 10.3 N·m (1.1 kg·m, 7.6 ft·lb) at 2,500 rpm |
| Cooling system | Forced air |
| Air cleaner | Dual type |
| Lubricating system | Splash |
| Ignition system | Transistorized magneto ignition |
| Fuel system | Horizontal type carburetor with butterfly valve |
| Fuel consumption | 1.4 Liters (0.37 US. gal, 0.31 Imp. gal.)/h |
| Fuel tank capacity | 3.1 L (0.82 US. gal. 0.68 Imp. gal.) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Recoil starter |
| Stoping system | Ignition primary circuit ground |
| Governor | Centrifugal weight system |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 314 x 363 x 335 mm (12.4 x 14.3 x 13.2 in) |
| Dry weight | 15.0 kg (33.1 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 8.5:1 |
| Cylinder bore: | 68.0 mm (2.68 in) |
| Piston stroke: | 45.0 mm (1.77 in) |
| Cylinder internal diameter (standard): | 68.000-68.020 mm (2.6772-2.6779 in) |
| Piston skirt outer diameter (standard): | 67.965-67.985 mm (2.6758-2.6766 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod big end diameter (standard): | 30.015-30.025 mm (1.1817-1.1821 in) |
| Connecting rod small end diameter (standard): | 18.006-18.017 mm (0.7089-0.7093 in) |
| Side clearance (Top): | 0.035-0.070 mm (0.0014-0.0028 in) |
| Side clearance (Second): | 0.045-0.080 mm (0.0018-0.0031 in) |
| Ring end gap (Top): | 0.200-0.350 mm (0.0079-0.0138 in) |
| Ring end gap (Second): | 0.350-0.500 mm (0.0138-0.0197 in) |
| Ring end gap (Oil): | 0.200-0.700 mm (0.0079-0.0276 in) |
| Ring width (Top): | 0.950-0.970 mm (0.0374-0.0382 in) |
| Ring width (Second): | 0.940-0.960 mm (0.037-0.0378 in) |
| Crankpin journal diameter: | 29.970-29.980 mm (1.1799-1.1803 in) |
| Crankshaft center distance: | 22.5 mm (0.885 in) |
| Cylinder head | |
| Valve arrangement: | OHV |
| Valves: | 2 |
| Valve steam diameter (INTAKE): | 5.468-5.480 mm (0.2153-0.2157 in) |
| Valve steam diameter (EXHAUST): | 5.425-5.440 mm (0.2136-0.2142 in) |
| Camshaft lobe height (INTAKE): | 27.500-27.900 mm (1.0827-1.0984 in) |
| Camshaft lobe height (EXHAUST): | 27.547-27.947 mm (1.0845-1.1003 in) |
| Camshaft journal diameter : | 13.966-13.984 mm (0.5498-0.5506 in) |
Tightening torque
| Tightening torque specs | |
| Crankcase cover bolt | 24 Nm; 2.4 kg·m; 18 ft·lb |
| Cylinder head bolt | 24 Nm; 2.4 kg·m; 18 ft·lb |
| Engine oil drain plug bolt | 18 Nm; 1.8 kg·m; 13 ft·lb |
| Connecting rod bolt | 12 Nm; 1.2 kg·m; 9 ft·lb |
| Rocker arm pivot bolt | 24 Nm; 2.4 kg·m; 18 ft·lb |
| Rocker arm pivot lock nut | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Oil level switch joint nut | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Flywheel nut | 75 Nm; 7.5 kg·m; 55 ft·lb |
| Fuel tank nut / bolt | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Air cleaner mount nut | 9 Nm; 0.9 kg·m; 6.6 ft·lb |
| Muffler nut | 24 Nm; 2.4 kg·m; 18 ft·lb |
| Recoil starter set screw | 10 Nm; 1.0 kg·m; 7 ft·lb |
Service Data
| Engine | |
| Maximum speed: | 3,900±150 rpm |
| Idle speed: | 1,400±150 rpm |
| Cylinder compression: | 5.0-7.0 kg/cm2 (71-100 psi, 0.49-0.69 MPa) at 600 rpm |
| Valve clearance | |
| Intake valve clearance: | 0.13-0.17 mm (0.0051-0.0067 in) |
| Exhaust valve clearance: | 0.18-0.22 mm (0.0071-0.0087 in) |
| Oil system | |
| Lubrication system: | Splash |
| Oil type: | Honda 4-stroke or an equivalent (SE or later) |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | 0.58 L (0.61 US. qt, 0.51 Imp. qt.) |
| Fuel system | |
| Type: | Horizontal type carburetor with butterfly valve |
| Main jet: | #72 |
| Float height: | 13.7 mm (0.5394 in) |
| Pilot screw opening: | 2-3/8 turns out |
| Ignition system | |
| Type: | Transistorized magneto ignition |
| Ignition timing: | 25° B.T.D.C (Fixed) |
| Spark plug: | NGK BPR6ES, DENSO W20EPR-U |
| Spark plug gap: | 0.7-0.8 mm (0.0276-0.0315 in) |
| Spark plug torque: | 18 N·m (1.8 kg·m, 13.3 ft·lb) |
| Ignition coil air gap | 0.2-0.6 mm (0.0079-0.0236 in) |
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