Honda GP160

Honda GP160The 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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