Honda GX360 K1

Honda GX360 K1The Honda GX360 K1 is a 359 cc (21.9 cu·in) natural aspirated single-cylinder four-stroke liquid-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Honda Motor Company for general-purpose applications.

It has a 58.0 mm (2.28 in) cylinder bore and 68.0 mm (2.68 in) piston stroke. The compression ratio rating is 8.5:1.

The Honda GX360 K1 engine produced 13.2 PS (9.7 kW; 13.0 HP) at 3,600 rpm of maximum output power and 25.7 N·m (2.6 kg·m, 18.9 ft·lb) at 3,000 rpm of peak torque.

The Honda GX360 K1 features:

  • OHV design
  • Transistorized ignition system
  • Horizontal type carburetor with butterfly valve
  • Centrifugal govervor
  • Forced oil by trochoid pump lubrication system
  • Liquid cooling system
  • Electric starter

General information

Engine Specifications
Engine model GX360 K1
Engine type 4-stroke, OHV, single-cylinder
Displacement 359 cm3, (21.9 cu·in)
Max. horsepower 13.2 PS (9.7 kW; 13.0 HP) at 3,600 rpm
Max. torque 25.7 N·m (2.6 kg·m, 18.9 ft·lb) at 3,000 rpm
Cooling system Liquid-cooled
Lubricating system Forced oil by trochoid pump
Ignition system Transistorized ignition
Fuel system Horizontal type carburetor with butterfly valve
Fuel tank capacity 6.0 L (1.59 US. gal. 1.32 Imp. gal.)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Electric starter
Stoping system Ignition primary circuit ground
Governor Centrifugal govervor
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 515 x 490 x 530 mm (20.3 x 19.3 x 20.9 in)
Dry weight 48.5 kg (106.9 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio: 8.5:1
Cylinder bore: 58.0 mm (2.28 in)
Piston stroke: 68.0 mm (2.68 in)
Cylinder internal diameter (standard): 58.000 mm (2.2835 in)
Piston skirt outer diameter (standard): 57.970 mm (2.2823 in)
Number of piston rings (compression / oil): 2/1
Side clearance (Top): 0.030 mm (0.0012 in)
Side clearance (Second): 0.030 mm (0.0012 in)
Side clearance (Oil): 0.030 mm (0.0012 in)
Ring end gap (Top): 0.200 mm (0.0079 in)
Ring end gap (Second): 0.200 mm (0.0079 in)
Ring width (Top): 1.200 mm (0.0472 in)
Ring width (Second): 1.200 mm (0.0472 in)
Crankshaft main journal diameter: 33.010 mm (1.2996 in)
Crankpin journal diameter: 32.000 mm (1.2598 in)
Cylinder head
Valves: 2
Valve head diameter (INTAKE): 28.0 mm (1.1024 in)
Valve head diameter (EXHAUST): 22.0 mm (0.8661 in)
Valve steam diameter (INTAKE): 5.468-5.480 mm (0.2153-0.2157 in)
Valve steam diameter (EXHAUST): 5.435-5.450 mm (0.214-0.2146 in)
Camshaft lobe height (INTAKE): 26.0 mm (1.0236 in)
Camshaft lobe height (EXHAUST): 25.9 mm (1.0197 in)
Camshaft journal diameter : 15.98 mm (0.6291 in)

Tightening torque specs

Tightening torque specs
Cylinder head – cylinder block (M8x1.25) 22.5 Nm; 2.25 kg·m; 16.3 ft·lb
Crankcase – cylinder block (M8x1.25) 22.5 Nm; 2.25 kg·m; 16.3 ft·lb
Crankcase – cylinder block (M6x1.0) 10 Nm; 1.0 kg·m; 7.2 ft·lb
Connecting rod – connecting rod cup (M7x0.75) 22 Nm; 2.2 kg·m; 15.9 ft·lb
Flywheel-crankshaft (M16x1.5) 115 Nm; 11.5 kg·m; 83.2 ft·lb
Timing pulley – crankshaft (M30x1.0) 22.5 Nm; 2.25 kg·m; 16.3 ft·lb
Crankshaft pulley – crankshaft (M10x1.25) 24 Nm; 2.4 kg·m; 17 ft·lb
Crankcase cover bolt (M8x1.25) 35 Nm; 3.5 kg·m; 25.3 ft·lb
Cylinder head-cover head (M6x1.0) 10 Nm; 1.0 kg·m; 7 ft·lb
Timing belt cover (M6x1.0) 8 Nm; 0.8 kg·m; 5.8 ft·lb
Muffler mounting nut (M8x1.25) 24 Nm; 2.4 kg·m; 17 ft·lb
Exhaust manifold – cylinder head (M8x1.25) 22 Nm; 2.2 kg·m; 15.9 ft·lb
Intake manifold – cylinder head (M6x1.0) 10 Nm; 0.1 kg·m; 7 ft·lb
Governor arm – shaft (M6x1.0) 10 Nm; 0.1 kg·m; 7 ft·lb
Water pump – cylinder block (M6x1.0) 10 Nm; 1.0 kg·m; 7 ft·lb
Governor case – cylinder head (M6x1.0) 10 Nm; 1.0 kg·m; 7 ft·lb
Cooling fan – shaft (M8x1.25) 22.5 Nm; 2.25 kg·m; 16.3 ft·lb
Air cleaner elbow – carburetor stud (M6x1.0) 8.5 Nm; 0.85 kg·m; 6.1 ft·lb
Standard torque values
Bolt, nut (5 mm) 5.5 Nm; 0.55 kg·m; 4.0 ft·lb
Bolt, nut (6 mm) 10 Nm; 1.0 kg·m; 7 ft·lb
Bolt, nut (8 mm) 24 Nm; 2.4 kg·m; 17 ft·lb
Bolt, nut (10 mm) 37.5 Nm; 3.75 kg·m; 27 ft·lb

Service Data

Idle speed: 1,300±150 rpm
Cylinder compression: 12.0 kg/cm2 (171 psi) at 500 rpm
Valve clearance
Intake valve clearance: 0.10-0.14 mm (0.0039-0.0055 in)
Exhaust valve clearance: 0.10-0.14 mm (0.0039-0.0055 in)
Oil system
Lubrication system: Forced oil by trochoid pump
Oil type: Honda 4-stroke or an equivalent (SE or SF)
Recommended oil: SAE 10W-40
Oil capacity: 1.4 L (1.48 US. qt, 1.23 Imp. qt.)
Oil pressure (min): 2.0 kg/cm2 (28.4 psi)
Cooling system
Coolant capacity (radiator and engine) 2.0 L (2.11 US qt)
Coolant capacity (reserve tank) 0.4 L (0.43 US qt)
Coolant capacity (total system) 2.4 L (2.54 US qt)
Fuel system
Type: Horizontal type carburetor with butterfly valve
Main jet: #88
Float height: 13.2 mm (0.5197 in)
Pilot screw opening: 1-1/4 turns out
Ignition system
Type: Transistorized ignition
Ignition timing: 24°±4° B.T.D.C.
Spark plug: NGK: BPR4HS
Spark plug gap: 0.6-0.7 mm (0.0236-0.0276 in)
Ignition coil air gap 0.2-0.6 mm (0.008-0.024 in)
Primary side ignition coil resistance 0.9-1.1 kΩ
Secondary side ignition coil resistance 8.8-13.2 kΩ
Ignition coil air gap 0.4 ± 0.2 (0.016 ± 0.008)
Starter motor
Brush length 14 mm (0.55 in), limit: 9.0 mm (0.35 in)
Mica depth (limit) 0.2 mm (0.008 in)

Applications

Manufacturer or Brand Models
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