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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