The Honda GX360 K1 is a 359 cc (21.9 cu-in) two-cylinders, water-cooled, four-stroke cycle, internal combustion small gasoline motor with horisontal shaft, manufactured by Honda Motor Company for general-purpose applications.
The GX360 engine has an horizontal type, butterfly valve carburetor, transistorized ignition system and electric starter. It is a liquid-cooling motor with a 58 mm (2.3 in) bore and a 68 mm (2.7 in) stroke, and 8.5:1 compression ratio.
The Honda GX360 K1 develops 13.2 PS (13.0 HP, 9.7 kW) at 3,600 rpm and 25.7 Nm (2.62 kg·m; 18.97 lbf·ft) of torque at 3,000 rpm.
General information
| Engine Specifications | |
| Model | GX360 K1 |
| Type | 4-stroke, OHV, 2-cylinder |
| Displacement | 359 cm 3 (21.9 cu-in) |
| Max. horsepower | 13.2 PS (13.0 HP, 9.7 kW) at 3,600 rpm |
| Max. torque (crank PTO) | 25.7 Nm (2.62 kg·m; 18.97 lbf·ft) at 3,000 rpm |
| Carburetor | Horizontal type, butterfly valve |
| Cooling system | Liquid-cooling |
| Ignition system | Transistorized ignition |
| Lubricating system | Forced oil by trochoid pump |
| Starting system | Electric starter |
| Stoping system | Ground of primary circuit |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 6.0 liters (6.34 US.qts, 5.28 Imp. qts) |
Dimensions and Weight
| GX360 | |
| Length, mm (in) | 515 (20.3) |
| Width, mm (in) | 490 (19.3) |
| Height, mm (in) | 530 (20.9) |
| Dry weight, kg (lb) | 45.0 (100.0) |
| Operating weight, kg (lb) | 48.5 (107.0) |
Cylinder Block and Head
The GX360 featured a two main bearing crankshaft and aluminum OHV (overhead camshaft) cylinder head with 2 valves per cylinder and belt driven camshaft. The piston has two compression rings and one oil ring. Intake valves are 28 mm in diameter, and the exhaust valves are 22 mm.
| Cylinder block | ||
| Compression ratio: | 8.5:1 | |
| Bore x Stroke | 58.0 X 68.0 mm (2.3 x 2.7 in) | |
| Sleeve internal diameter | 58.00 mm (2.283 in) | |
| Piston skirt outer diameter | 57.97 mm (2.282 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Piston ring side clearance (Top): | 0.030 mm (0.001 in) | |
| Piston ring side clearance (Second): | 0.030 mm (0.001 in) | |
| Piston ring side clearance (Oil): | 0.030 mm (0.001 in) | |
| Piston ring end gap (Top): | 0.20 mm (0.08 in) | |
| Piston ring end gap (Second): | 0.20 mm (0.08 in) | |
| Ring width (Top): | 1.19 mm (0.047 in) | |
| Ring width (Second): | 1.19 mm (0.047 in) | |
| Crankshaft journal diameter | 33.009 mm (1.2996 in) | |
| Crankpin diameter | 32.000 mm (1.2598 in) | |
| Cylinder Head | ||
| Warpage (limit) | 0.10 mm (0.004 in) | |
| Valve Arrangement: | OHV | |
| Valves: | 4 (2 per cylinder) | |
| Valve head diameter (INTAKE): | 28.0 mm (1.10 in) | |
| Valve head diameter (EXHAUST): | 22.0 mm (0.87 in) | |
| Valve stem outer diameter (INTAKE): | 5.468-5.480 mm (0.2153-0.2157 in) | |
| Valve stem outer diameter (EXHAUST): | 5.435-5.450 mm (0.2140-0.2146 in) | |
| Rocker arm shaft outer diameter: | 12.957 mm (0.510 in) | |
| Rocker arm internal diameter: | 13.015 mm (0.512 in) | |
| Camshaft cam height (INTAKE): | 26.0 mm (1.024 in) | |
| Camshaft cam height (EXHAUST): | 25.9 mm (1.02 in) | |
| Camshaft outer diameter (governor and timing side): |
15.98 mm (0.629 in) | |
Maintenance data
| Engine | |
| Idle speed | 1,300 ± 150 rpm |
| Cylinder compression | 12.0 kg/cm2 (171 psi) at 500 rpm |
| Valve clearance | |
| Intake valve | 0.10-0.14 mm (0.004-0.006 in) |
| Exhaust valve | 0.10-0.14 mm (0.004-0.006 in) |
| Carburetor | |
| Main jet | #88 |
| Float height | 13.2 mm (0.52 in) |
| Pilot screw opening | 1-1/4 turns out |
| Oil system | |
| Oil type | Honda 4-stroke or an equivalent (SE or SF) |
| Recommended oil | SAE 10W-40 |
| Oil capacity (without filter changed) | 1.1 liters (1.16 US.qts, 0.97 Imp. qts) |
| Oil capacity (with filter changed) | 1.4 liters (1.48 US.qts, 1.23 Imp. qts) |
| Oil pressure (min) | 2.0 kg/cm2 (28.4 psi) |
| Cooling system | |
| Coolant capacity (radiator and engine) | 2.0 liters (2.11 US.qts, 1.76 Imp. qts) |
| Coolant capacity (reserve tank) | 0.4 liters (0.42 US.qts, 0.35 Imp. qts) |
| Coolant capacity (total system) | 2.4 liters (2.54 US.qts, 2.11 Imp. qts) |
| Thermostat | |
| Sub valve (start opening) | 77° C (171° F) |
| Sub valve (fully open) | 82° C (180° F) |
| Sub valve (lift height) | 1.5 mm (0.06 in) |
| Main valve (fully open) | 85 ° C (185 ° F) |
| Sub valve (lift height) | 6.5 mm (0.26 in) |
| Thermoswitch | |
| Temperature range for continuity | 110° ± 2° C (230° ± 36° C) |
| Oil pump | |
| Tip clearance (standard) | 0.15 mm (0.006 in) |
| Outer rotor clearance (standard) | 0.12-0.22 mm (0.005-0.009 in) |
| Rotor-to-pump body clearance (standard) | 0.04-0.09 mm (0.0016-0.0035 in) |
| Ignition system | |
| Ignition timing | 24 ° ± 4 ° B.T.D.C (Fixed) |
| Spark plug | NGK: BPR4HS |
| Spark plug gap | 0.6-0.7 mm (0.024-0.028 in) |
| Primary side ignition coil resistance | 0.9-1.1 Ω |
| 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) |
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 |
Author:
Very complete and easy to read. This is a five star reference.
Thank you!
hi
I have a Honda engine GX 360 K1 I Need parts list for this engine can you help me and send me the list please because I need same parts. Engine number GA01-1280846 and from were can I buy the parts?
Thanks a lot,
Stephan Sladden.
Hi
We are not a dealer or a trading company, so we do not have this information, but you can see here http://www.honda-engines-eu.com/spare-parts-page.
Are there any emission factors available for this engine? Also, BSFC and/or fuel use at 100% load, and exhaust characteristics (temperature, flow rate, etc.) would be of great help. I’m trying to add this engine to a client’s air permit. Thanks.
salve a tutti mi servirebbe un motore nuovo mi potete dare qualche indicazione di un rivenditore
grazie
How about timing belt tension specs?
Hi i am just wondering if honda makes a 35-37 horse power water cooled motor
That is the size of the motor that i require for the for what i have to make