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:
- 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 |
| Lawn tractors | |
| Honda | H4514 |
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