The 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:
- Overhead valve (OHV) design
- Transistorized ignition system
- Horizontal type carburetor with butterfly valve
- Centrifugal govervor
- Forced oil by trochoid pump lubrication system
- Liquid cooling system
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 |
Lawn tractors | |
Honda | H4514 |
We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.
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