Honda GXV390

Honda GXV390The Honda GXV390 is a 389 cc, (23.74 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a vertical PTO shaft, manufactured by Honda Motor Company for general-purpose applications.

It has an 88.0 mm (3.46 in) cylinder bore and 64.0 mm (2.52 in) piston stroke. The compression ratio rating is 7.7:1.

This engine produced 13.2 PS (9.7 kW; 13.0 HP) at 3,600 rpm of horsepower and 28.0 N·m (2.9 kg·m, 20.6 ft·lb) at 2,500 rpm of torque.

The Honda GXV390 features:

  • OHV design
  • Vertical PTO shaft
  • Transistorized magneto ignition system
  • Horizontal type carburetor with butterfly valve
  • Centrifugal govervor
  • Splash type lubrication system
  • Forced air cooling system
  • Recoil or electric starter

General information

Engine Specifications
Engine model GXV390
Engine type 4-stroke, OHV, single-cylinder
Displacement 389 cm3, (23.74 cu·in)
Max. horsepower 13.2 PS (9.7 kW; 13.0 HP) at 3,600 rpm
Max. torque 28.0 N·m (2.9 kg·m, 20.6 ft·lb) at 2,500 rpm
Cooling system Forced air
Air cleaner Dual element type, oil-bath type, cyclone type
Lubricating system Splash type
Ignition system Transistorized magneto ignition
Fuel system Horizontal type carburetor with butterfly valve
Fuel tank capacity 2.3 L (0.61 US. gal. 0.51 Imp. gal.)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil or 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) 430 x 385 x 410 mm (16.9 x 15.2 x 16.1 in)
Dry weight 33.0 kg (72.8 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio: 7.7:1
Cylinder bore: 88.0 mm (3.46 in)
Piston stroke: 64.0 mm (2.52 in)
Cylinder internal diameter (standard): 88.000 mm (3.4646 in)
Piston skirt outer diameter (standard): 87.985 mm (3.464 in)
Number of piston rings (compression / oil): 2/1
Connecting rod big end diameter (standard): 36.025-36.039 mm (1.4183-1.4189 in)
Connecting rod small end diameter (standard): 20.005-20.020 mm (0.7876-0.7882 in)
Piston pin diameter: 20.000 mm (0.7874 in)
Side clearance (Top): 0.030-0.060 mm (0.0012-0.0024 in)
Side clearance (Second): 0.030-0.060 mm (0.0012-0.0024 in)
Ring end gap (Top): 0.20-1.175 mm (0.0079-0.0463 in)
Ring end gap (Second): 0.20-1.175 mm (0.0079-0.0463 in)
Ring width (Top): 1.160 mm (0.0457 in)
Ring width (Second): 1.160 mm (0.0457 in)
Crankpin journal diameter: 35.975-35.985 mm (1.4163-1.4167 in)
Cylinder head
Valve arrangement: OHV, gear driven
Valves: 2
Valve steam diameter (INTAKE): 6.590 mm (0.2594 in)
Valve steam diameter (EXHAUST): 6.550 mm (0.2579 in)
Camshaft lobe height (INTAKE): 32.60 mm (1.2835 in)
Camshaft lobe height (EXHAUST): 32.09 mm (1.2634 in)
Camshaft journal diameter : 16.000 mm (0.6299 in)

Tightening torque

Tightening torque specs
Connecting rod bolt 14 Nm; 1.4 kg·m; 10 ft·lb
Cylinder head bolt 35 Nm; 3.5 kg·m; 25 ft·lb
Flywheel nut 115 Nm; 11.5 kg·m; 83 ft·lb
Pivot adjusting nut 10 Nm; 1.0 kg·m; 7 ft·lb
Push rod guide pivot bolt 24 Nm; 2.4 kg·m; 17 ft·lb
Oil pan bolt 24 Nm; 2.4 kg·m; 17 ft·lb
Air cleaner body cap nut 9 Nm; 0.9 kg·m; 6.5 ft·lb
Muffler mounting nut 24 Nm; 2.4 kg·m; 17 ft·lb
Exhaust pipe mounting nut 24 Nm; 2.4 kg·m; 17 ft·lb
Oil drain plug 45 Nm; 4.5 kg·m; 34 ft·lb
Cylinder head cover bolt 9 Nm; 0.9 kg·m; 6.5 ft·lb
Fuel tank bolt 24 Nm; 2.4 kg·m; 17 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
Bolt, nut (12 mm) 55 Nm; 5.5 kg·m; 40 ft·lb

Service Data

Engine
Maximum speed: 3,400±150 rpm
Idle speed: 1,400 ±150 rpm rpm
Cylinder compression: 5.0-8.5 kg/cm2 (71-151 psi) at 600 rpm
Valve clearance
Intake valve clearance: 0.08-0.12 mm (0.0031-0.0047 in)
Exhaust valve clearance: 0.13-0.17 mm (0.0051-0.0067 in)
Oil system
Lubrication system: Splash type
Oil type: Honda 4-stroke or an equivalent (SE or later)
Recommended oil: SAE 10W-30
Oil capacity: 1.1 L (1.16 US. qt, 0.97 Imp. qt.)
Fuel system
Type: Horizontal type carburetor with butterfly valve
Main jet: #95
Float height: 11.9-14.5 mm (0.4685 in)
Pilot screw opening: 2-1/2 turns out
Ignition system
Type: Transistorized magneto ignition
Ignition timing: B.T.D.C. 20° (Fixed)
Spark plug: NGK: BPR5ES, NIPPONDENSO: W16EPR-U
Spark plug gap: 0.7-0.8 mm (0.0276-0.0315 in)
Ignition coil air gap 0.4±0.2 mm (0.016±0.008 in)

Applications

Manufacturer or Brand Models
Lawn tractors
Honda H2013, H2113, H3013H, H4013, H5013, HF2213

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