Honda GC160

Honda GC160The Honda GC160 is a 160 cc (9.8 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.

It has a 64.0 mm (2.52 in) cylinder bore and 50.0 mm (1.97 in) piston stroke. The compression ratio rating is 8.5:1.

The GC160 engine produced 5.0 PS (3.7 kW; 5.0 HP) at 3,600 rpm of maximum horsepower and 10.3 N·m (1.1 kg·m, 7.6 ft·lb) at 2,500 rpm of maximum torque.

The Honda GC160 features:

  • OHV design
  • Transistorized magnetoignition system
  • Horizontal type carburetor with butterfly valve
  • Centrifugal govervor
  • Splash type lubrication system
  • Forced air cooling system
  • Recoil starter

General information

Engine Specifications
Engine model GC160
Engine type 4-stroke, OHV, single-cylinder
Displacement 160 cm3, (9.8 cu·in)
Max. horsepower 5.0 PS (3.7 kW; 5.0 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 Dry type
Lubricating system Splash
Ignition system Transistorized magneto ignition
Fuel system Horizontal type carburetor with butterfly valve
Fuel consumption 230 g/HPh
Fuel tank capacity 2.0 L (0.53 US. gal. 0.44 Imp. gal.)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil starter
Stoping system Ignition primary circuit ground
Governor Centrifugal govervor
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (S series) – (L x W X H) 328 x 369 x 331 mm (12.9 x 14.5 x 13 in)
Dry weight 11.5 kg (25.4 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio: 8.5:1
Cylinder bore: 64.0 mm (2.52 in)
Piston stroke: 50.0 mm (1.97 in)
Cylinder internal diameter (standard): 64.000 mm (2.5197 in)
Piston skirt outer diameter (standard): 63.969 mm (2.5185 in)
Number of piston rings (compression / oil): 2/1
Connecting rod big end diameter (standard): 26.020 mm (1.0244 in)
Connecting rod small end diameter (standard): 13.005 mm (0.512 in)
Side clearance (Top): 0.015-0.045 mm (0.0006-0.0018 in)
Side clearance (Second): 0.015-0.045 mm (0.0006-0.0018 in)
Side clearance (Oil): 0.015-0.045 mm (0.0006-0.0018 in)
Ring end gap (Top): 0.200-0.350 mm (0.0079-0.0138 in)
Ring end gap (Second): 0.300-0.450 mm (0.0118-0.0177 in)
Ring end gap (Oil): 0.150-0.350 mm (0.0059-0.0138 in)
Ring width (Top): 1.5 mm (0.0591 in)
Ring width (Second): 1.5 mm (0.0591 in)
Ring width (Oil): 2.5 mm (0.0984 in)
Crankshaft main journal diameter: PTO side: 27.993 (1.1021 in)
Flywheel side: 25.393 mm (0.9997 in)
Crankpin journal diameter: 25.980 mm (1.0228 in)
Crankshaft center distance: 25.0 mm (0.985 in)
Cylinder head
Valve arrangement: OHV
Valves: 2
Valve steam diameter (INTAKE): 5.480 mm (0.2157 in)
Valve steam diameter (EXHAUST): 5.440 mm (0.2142 in)
Valve spring free length (INTAKE): 34.0 mm (1.3386 in)
Valve spring free length (EXHAUST): 34.0 mm (1.3386 in)

Tightening torque

Tightening torque specs
Air cleaner case bolt 10 Nm; 1.0 kg·m; 7 ft·lb
Crankcase cover bolt 12 Nm; 1.2 kg·m; 8.6 ft·lb
Connecting rod bolt 12 Nm; 1.2 kg·m; 8.6 ft·lb
Valve adjusting lock nut 8 Nm; 0.8 kg·m; 5.8 ft·lb
Cylinder head cover bolt 12 Nm; 1.2 kg·m; 8.6 ft·lb
Oil drain plug bolt 24 Nm; 2.4 kg·m; 17 ft·lb
Flywheel nut 52 Nm; 5.3 kg·m; 38 ft·lb
Governor arm nut 10 Nm; 1.0 kg·m; 7 ft·lb
Muffler bolt 12 Nm; 1.2 kg·m; 8.6 ft·lb
Recoil starter nut 8.5 Nm; 0.85 kg·m; 6.1 ft·lb
Fan cover stud bolt 12 Nm; 1.2 kg·m; 8.6 ft·lb
Fuel tank bolt, nut 10 Nm; 1.0 kg·m; 7 ft·lb
Spark plug 20 Nm; 2.0 kg·m; 14 ft·lb
Others
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
8 mm bolts, nuts 24 Nm; 2.4 kg·m; 17 ft·lb
10 mm bolts, nuts 37 Nm; 3.7 kg·m; 27 ft·lb
12 mm bolts, nuts 55 Nm; 5.5 kg·m; 39.5 ft·lb

Service Data

Engine
Maximum speed: 3,600-4,000 rpm
Idle speed: 1,250-1,500 rpm
Valve clearance
Intake valve clearance: 0.15±0.04 mm (0.006±0.002 in)
Exhaust valve clearance: 0.20±0.04 mm (0.008±0.002 in)
Oil system
Lubrication system: Splash
Oil type: Honda 4-stroke or an equivalent (SE or SF)
Recommended oil: SAE 10W-30
Oil capacity: 0.58 L (0.61 US. qt, 0.51 Imp. qt.)
Fuel system
Type: Horizontal type carburetor with butterfly valve
Main jet: #65
Float height: 9.2 mm (0.3622 in)
Pilot screw opening: 1-3/4 turns out
Ignition system
Type: Transistorized magneto ignition
Ignition timing: 20° B.T.D.C.
Spark plug: NGK BPR6ES
Spark plug gap: 0.7-0.8 mm (0.0276-0.0315 in)
Spark plug torque: 20 N·m (2 kg·m, 14.7 ft·lb)

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