The Honda GP160 is a 0.16 l (163 cc, 9.9 cu·in) single-cylinder air-coolled 4-stroke internal combustion small gasoline engine with horizontal shaft, manufactured by Honda Motor.
The Honda GP160 has overhead valve design, single-cylinder inclined by 25°, transistorized magneto ignition system and horizontal carburetor with a butterfly valve. It was equipped with a recoil starter. The GP160 engine has a bore and stroke of 68.0 mm x 45.0 mm. Compression ratio rating is 8.5:1.
The Honda GP160 net power is 4.8 HP (3.6 kW) at 3,600 rpm and continuously rated power 3.9 HP (2.9 kW) at 3,600 rpm. Maximum net torque is 10.3 Nm (1.05 kg·m, 7,6 ft·lb) of torque at 2,500 rpm.
General information
| Engine Specifications | |
| Model | GP160H |
| Type | 4-stroke, OHV, single cylinder, inclined by 25° |
| Displacement | 163 cm 3 (9.9 cu·in) |
| Max. horsepower | 4.8 HP (3.6 kW) at 3,600 rpm |
| Max. torque (crank PTO) | 10.3 Nm (1.05 kg·m, 7,6 ft·lb) at 2,500 rpm |
| Carburetor | Horizontal type, butterfly valve |
| Cooling system | Forced-air |
| Ignition system | Transistorized magneto ignition |
| Lubricating system | Forced splash |
| Starting system | Recoil starter |
| Stoping system | Ignition primary circuit ground |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel consumption | 3.1 Liters (0.82 US gal, 0.68 Imp gal) / h |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| Honda GP160 (Type Q) | |
| Length, mm (in) | 314 (12.4) |
| Width, mm (in) | 363 (14.3) |
| Height, mm (in) | 335 (13.2) |
| Dry weight, kg (lb) | 14.9 (32.8) |
| Operating weight, kg (lb) |
17.8 (39.2) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 8.5:1 | |
| Bore x Stroke | 68 X 45 mm (2.68 x 1.77 in) | |
| Sleeve internal diameter | 68.000-68.020 mm (2.6772-2.6779 in) | |
| Piston skirt outer diameter | 67.965-67.985 mm (2.6758-2.6766 mm) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Ring side clearance | Top | 0.035-0.070 (0.0014-0.0028) |
| Second | 0.045-0.080 mm (0.0018-0.0032 in) | |
| Ring end gap | Top | 0.200-0.350 mm (0.0079-0.0138 in) | Second | 0.350-0.500 mm (0.0138-0.0197 in) |
| Oil (side rail) | 0.20-0.70 mm (0.008-0.028 in) | |
| Ring width | Top | 0.950-0.970 mm (0.0374-0.0382 in) |
| Second | 0.940-0.960 mm (0.0370-0.0378 in) | |
| Connecting rod small end I.D. | 18.006-18.017 mm (0.7089-0.7093 in) | |
| Connecting rod big end I.D. | 30.015-30.025 mm (1.1817-1.1821 in) | |
| Crankpin outer diameter | 29.970-29.980 mm (1.1799-1.1803 in) | |
| Cylinder Head | ||
| Warpage (limit) | 0.10 mm (0.004 in) | |
| Valve Arrangement: | OHV | |
| Valves: | 2 | |
| Stem outer diameter (standard): | INTAKE | 5.468-5.480 mm (0.2153-0.2157 in) |
| EXHAUST | 5.425-5.440 mm (0.2136-0.2142 in) | |
| Guaide inner diameter: | INTAKE/EXHAUST | 5.500-5.512 mm (0.2165-0.2170 in) |
| Cam height: | INTAKE | 27.500-27.900 mm (1.0827-1.0984 in) |
| EXHAUST | 27.547-27.947 mm (1.0845-1.1003 in) | |
| Camshaft outer diameter: | 13.966-13.984 mm (0.5498-0.5506 in) | |
Tightening torque specs
| 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 |
Maintenance 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 | 0.15 ± 0.02 (0.006 ± 0.001) |
| Exhaust valve | 0.20 ± 0.02 (0.008 ± 0.001) |
| Carburetor | |
| Main jet | #72 |
| Float height | 13.7 mm (0.54 in) |
| Pilot screw opening | 2-3/8 turns out |
| Oil system | |
| 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) |
| Ignition system | |
| Ignition timing | B.T.D.C. 25° (Fixed) |
| Spark plug | NGK: BPR6ES DENSO: W20EPR-U |
| Spark plug gap | 0.7-0.8 mm (0.028-0.031 in) |
| Spark plug torque | 18 Nm; 1.8 kg·m; 13 ft·lb |
| Ignition coil air gap | 0.2-0.6 mm (0.01-0.02 in) |
| Ignition coil primary resistance | 0.68-0.92 Ω |
| Ignition coil secondary resistance | 5.6-8.4 kΩ |
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