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Honda GX360 Engine

General Technical Data

Honda GX360 Engine Specifications

Engine Model ............... Honda GX360
Engine Type ............... 4-cycle OHC 2-cylinder small gasoline engine
Number of Cylinders ............... 2
Displacement, cu.in (cc) ............... 21.9 (359)
Engine Bore, in (mm) ............... 2.28 (58.0)
Engine Stroke, in (mm) ............... 2.68 (68.0)
Rated Engine Power, hp (kW) ............... 13.0 (9.6)
Rated Engine Speed, rpm ............... 3600
Maximum Torque, Nm (ft-lbs) ............... 25.7 (19.0)
Torque Speed, rpm ............... 3000
Compression ............... 8.5:1
Valve Arrangement ............... Overhead camshaft
Lubrication System ............... Forced oil by trochoid pump
Air Cleaner ............... Dual element
Cooling System ............... Liquid cooled
Coolant Capacity, qts (L) ............... 2.54 (2.40)
Ignition System ............... Transistorized
Stopping System ............... Primary circuit ground
Starting System ............... Electric starter

Fuel System

Fuel System Type ............... Carburetor
Carburetor Type ............... Horizonal, butterfly valve
Governor Type ............... Centrifugal
Fuel Type ............... Gasoline (86 or higher)

Dimensions and Weight

Length, in (mm) ............... 20.3 (515)
Width, in (mm) ............... 19.3 (490)
Height, in (mm) ............... 20.9 (530)
Net Weight, lbs (kg) ............... 100 (45.0)
Operating Weight, lbs (kg) ............... 107 (48.5)

Honda GX360 Maintenance Data

Cylinder Block and Valves

Cylinder Bore Inside Diameter (Maximum), in (mm) ............... 2.2874 (58.100)
Cylinder Compression, psi (kPa) ............... 171 (1200)
Cylinder Head (Max. Out of Flatness), in (mm) ............... 0.004 (0.10)
Intake Valve Clearance, in (mm) ............... 0.004-0.006 (0.10-0.14)
Exhaust Valve Clearance, in (mm) ............... 0.004-0.006 (0.10-0.14)

Engine Oil and Filter

Engine Oil Type (Summer) ............... SAE 10W-40
Engine Oil Type (Winter) ............... SAE 5W-30
API Service Classifications ............... SE or SF
Oil Capacity, qts (L) ............... 1.48 (1.40)
Oil Filter Part Number ............... 15400-ZZ3-003
Air Filter Part Number ............... 17210-ZA0-505

Carburetor Adjustment

Main Jet ............... #88
Idle Fuel ............... 1-1/4 turns out
Float Height, in (mm) ............... 0.52 (13.2)
Low Idle Speed, rpm ............... 1300±150
High Idle Speed, rpm ............... 3600±150

Ignition System

Spark Plug Type ............... NGK BPR4HS
Spark Plug Gap, in (mm) ............... 0.024-0.028 (0.60-0.70)
Module Air Gap, in (mm) ............... 0.008-0.024 (0.20-0.60)
Ignition Timing, deg ............... 22-26 BTDC
Spark Plug Torque, Nm (ft-lbs) ............... 18 (13)

Service Intervals

Clean Air Cleaner Element ............... Every 50 hours
Change Engine Oil ............... Every 100 hours
Check and Adjust Spark Plug ............... Every 100 hours
Check Carburetor Adjustment ............... Every 100 hours
Check Fuel Filter ............... Every 100 hours
Change Engine Oil Filter ............... Every 300 hours
Check and Adjust Valve Clearance ............... Every 300 hours
Replace Air Cleaner Element ............... Every 300 hours
Replace Spark Plug ............... Every 300 hours
Change Radiator Coolant ............... Every 500 hours

Honda GX360 Service Specifications

Cylinder Block

Cylinder Bore Inside Diameter (Std), in (mm) ............... 2.8300-2.8306 (58.000-57.015)
Cylinder Bore Inside Diameter (Wear Limit), in (mm) ............... 2.2874 (58.100)
Connecting Rod Small End Inside Diameter (Std), in (mm) ............... 0.552 (14.016)
Connecting Rod Small End Inside Diameter (Wear Limit), in (mm) ............... 0.554 (14.070)
Connecting Rod Big End Oil Clearance (Std), in (mm) ............... 0.001 (0.025)
Connecting Rod Big End Oil Clearance (Wear Limit), in (mm) ............... 0.002 (0.045)
Crankshaft Pin Outside Diameter (Pin), in (mm) ............... 1.2598 (32.000)
Crankshaft Pin Outside Diameter (Main), in (mm) ............... 1.2996 (33.009)
Crankshaft Main Bearing Oil Clearance, in (mm) ............... 0.001-0.002 (0.02-0.04)
Crankshaft Side Clearance, in (mm) ............... 0.008-0.016 (0.20-0.40)
Camshaft Journal Outside Diameter (Std), in (mm) ............... 0.629 (15.980)
Camshaft Journal Outside Diameter (Wear Limit), in (mm) ............... 0.626 (15.900)
Rocker Arm Inside Diameter (Std), in (mm) ............... 0.512 (13.015)
Rocker Arm Shaft Outside Diameter (Std), in (mm) ............... 0.510 (12.957)

Cylinder Head and Valves

Cylinder Head (Max. Out of Flatness), in (mm) ............... 0.004 (0.10)
Intake Valve Clearance, in (mm) ............... 0.004-0.006 (0.10-0.14)
Exhaust Valve Clearance, in (mm) ............... 0.004-0.006 (0.10-0.14)
Intake Valve Stem Outside Diameter (Std), in (mm) ............... 0.216 (5.480)
Intake Valve Stem Outside Diameter (Wear Limit), in (mm) ............... 0.209 (5.320)
Exhaust Valve Stem Outside Diameter (Std), in (mm) ............... 0.215 (5.450)
Exhaust Valve Stem Outside Diameter (Wear Limit), in (mm) ............... 0.208 (5.290)
Intake Valve Guide Inside Diameter, in (mm) ............... 0.217 (5.500)
Exhaust Valve Guide Inside Diameter, in (mm) ............... 0.217 (5.500)
Valve Seat Width (Intake/Exhaust), in (mm) ............... 0.030 (0.70)
Valve Spring Free Length, in (mm) ............... 1.14 (29.00)
Cam Height (Intake), in (mm) ............... 1.024 (26.00)
Cam Height (Exhaust), in (mm) ............... 1.020 (25.90)

Piston and Piston Rings

Piston Pin Bore Inside Diameter (Std), in (mm) ............... 0.5512 (14.000)
Piston Pin Bore Inside Diameter (Wear Limit), in (mm) ............... 0.5490 (13.954)
Piston Skirt Outside Diameter, in (mm) ............... 2.2820 (57.970)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0-0.002 (0.0-0.05)
Piston Pin Outside Diameter (Std), in (mm) ............... 0.5116-0.5118 (12.994-13.000)
Piston Pin Outside Diameter (Wear Limit), in (mm) ............... 0.5100 (12.954)
Pin Hole Inside Diameter (Std), in (mm) ............... 0.5514 (14.005)
Pin Hole Inside Diameter (Wear Limit), in (mm) ............... 0.553 (14.055)
Top Compression Ring Width, in (mm) ............... 0.047 (1.19)
Second Compression Ring Width, in (mm) ............... 0.047 (1.19)
Top Compression Ring Groove Side Clearance, in (mm) ............... 0.001 (0.03)
Second Compression Ring Groove Side Clearance, in (mm) ............... 0.001 (0.03)
Top Compression Ring End Gap, in (mm) ............... 0.008 (0.20)
Second Compression Ring End Gap, in (mm) ............... 0.008 (0.20)
Ring End Gap (Wear Limit), in (mm) ............... 0.024 (0.60)

Honda GX360 Tightening Torque Specs

Cylinder head to cylinder block (8x1.25), Nm (ft-lb) ............... 22.5 (16.3)
Crankcase to cylinder block (8x1.25), Nm (ft-lb) ............... 22.5 (16.3)
Crankcase to cylinder block (6x1.0), Nm (ft-lb) ............... 10 (7.2)
Connecting rod to connecting rod cap (7x0.75), Nm (ft-lb) ............... 22 (15.9)
Flywheel to crankshaft (16x1.5), Nm (ft-lb) ............... 115 (83.2)
Timing pulley to crankshaft (30x1.0), Nm (ft-lb) ............... 22.5 (16.3)
Camshaft pulley to camshaft (10x1.25), Nm (ft-lb) ............... 35 (25.3)
Cylinder head cover to head (6x1.0), Nm (ft-lb) ............... 10 (7.2)
Exhaust manifold to cylinder head (8x1.25), Nm (ft-lb) ............... 22 (15.9)
Intake manifold to cylinder head (6x1.0), Nm (ft-lb) ............... 10 (7.2)
Governor arm to shaft (6x1.0), Nm (ft-lb) ............... 10 (7.2)
Water pump assy to cylinder block (6x1.0), Nm (ft-lb) ............... 10 (7.2)
Governor case to cylinder head (6x1.0), Nm (ft-lb) ............... 10 (7.2)
Cooling fan to shaft (8x1.25), Nm (ft-lb) ............... 22.5 (16.3)
Air cleaner elbow to carburetor stud (6x1.0), Nm (ft-lb) ............... 8.5 (6.1)