The 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
The 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.
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