The Honda GV400 is a 406 cc (24.8 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a vertical shaft, manufactured by Honda Motor Company for general-purpose applications.
It has an 86.0 mm (3.39 in) cylinder bore and a 70.0 mm (2.76 in) piston stroke. The compression ratio rating is 6.5:1.
The GV400 engine produced 11.2 PS (8.2 kW; 11.0 HP) at 3,600 rpm of maximum horsepower and 24.5 N·m (2.5 kg·m, 18.1 ft·lb) at 3,000 rpm of maximum torque.
The Honda GV400 features:
- L-head design
- Transistorized magneto or CDI ignition system
- Horizontal type carburetor with butterfly valve
- Centrifugal governor
- Forced air cooling system
- Recoil starter or electric starter
General information
| Engine Specifications | |
| Engine model | GV400 |
| Engine type | 4-stroke, L-head, single-cylinder |
| Displacement | 406 cm3, (24.8 cu·in) |
| Max. horsepower | 11.2 PS (8.2 kW; 11.0 HP) at 3,600 rpm |
| Max. torque | 24.5 N·m (2.5 kg·m, 18.1 ft·lb) at 3,000 rpm |
| Cooling system | Forced air |
| Air cleaner | Dual-element |
| Lubricating system | Trochoid oil pump |
| Ignition system | Transistorized magneto or CDI |
| Fuel system | Horizontal type carburetor with butterfly valve |
| Fuel consumption | 270 g/HPh |
| 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 starter or electric starter |
| Stoping system | Ignition primary circuit ground |
| Governor | Centrifugal governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | – |
| Dry weight | – |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 6.5:1 |
| Cylinder bore: | 86.0 mm (3.39 in) |
| Piston stroke: | 70.0 mm (2.76 in) |
| Cylinder internal diameter (standard): | 86.000 mm (3.3858 in) |
| Piston skirt outer diameter (standard): | 85.970-86.000 mm (3.3846-3.3858 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod small end diameter (standard): | 19.005-19.020 mm (0.7482-0.7488 in) |
| Side clearance (Top): | 0.020-0.060 mm (0.0008-0.0024 in) |
| Side clearance (Second): | 0.010-0.050 mm (0.0004-0.002 in) |
| Side clearance (Oil): | 0.010-0.050 mm (0.0004-0.002 in) |
| Ring end gap (Top): | 0.200-0.400 mm (0.0079-0.0157 in) |
| Ring end gap (Second): | 0.200-0.400 mm (0.0079-0.0157 in) |
| Ring end gap (Oil): | 0.200-0.400 mm (0.0079-0.0157 in) |
| Crankpin journal diameter: | 36.951-36.958 mm (1.4548-1.455 in) |
| Crankshaft center distance: | 35.0 mm (1.38 in) |
| Cylinder head | |
| Valve arrangement: | L-head, chain driven |
| Valves: | 2 |
| Valve steam diameter (INTAKE): | 6.955-6.970 mm (0.2738-0.2744 in) |
| Valve steam diameter (EXHAUST): | 6.910-6.925 mm (0.272-0.2726 in) |
| Valve spring free length (INTAKE): | 42.700 mm (1.6811 in) |
| Valve spring free length (EXHAUST): | 42.700 mm (1.6811 in) |
| Camshaft lobe height (INTAKE): | 38.500-38.700 mm (1.5157-1.5236 in) |
| Camshaft lobe height (EXHAUST): | 38.500-38.700 mm (1.5157-1.5236 in) |
Tightening torque specs
| Tightening torque specs | |
| Cylinder head (10 mm bolt) |
Serial number before 2006140: 43-47 Nm; 4.3-4.7 kg·m; 31-40 ft·lb Serial number after 2006141: 32-38 Nm; 3.2-3.8 kg·m; 23-27 ft·lb |
| Connecting rod lower cap (8 mm bolt) | 21-26 Nm; 2.1-2.6 kg·m; 15.6-19.1 ft·lb |
| Flywheel (16 mm nut) | 110-120 Nm; 11-12 kg·m; 77-87 ft·lb |
| Drain bolt (20 mm bolt) | 40-50 Nm; 4.0-5.0 kg·m; 29-36 ft·lb |
| Oil pan (8 mm bolt) | 21-27 Nm; 2.1-2.7 kg·m; 15-19 ft·lb |
| Others | |
| 5 mm bolts, nuts | 4-7 Nm; 0.4-0.7 kg·m; 2.9-5.1 ft·lb |
| 6 mm bolts, nuts | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
| 8 mm bolts, nuts | 20-28 Nm; 2.0-2.8 kg·m; 14.5-20.3 ft·lb |
| 10 mm bolts, nuts | 35-40 Nm; 3.5-4.0 kg·m; 25-29 ft·lb |
Service Data
| Idle speed: | 1,700 ± 150 rpm |
| Cylinder compression: | 8.0 kg/cm2 at 1,400 rpm |
| Valve clearance | |
| Intake valve clearance: | 0.06-0.12 mm (0.0024-0.0047 in) |
| Exhaust valve clearance: | 0.09-0.15 mm (0.0035-0.0059 in) |
| Oil system | |
| Lubrication system: | Trochoid oil pump |
| Oil type: | Honda 4-stroke or an equivalent (SG.SF/CC.CD) |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | 1.2 L (1.27 US. qt, 1.06 Imp. qt.) |
| Fuel system | |
| Type: | Horizontal type carburetor with butterfly valve |
| Main jet: | #105 |
| Float height: | 6.7-9.7 mm mm (0.2638 in) |
| Pilot screw opening: |
K0: 1-1/2 turns out K1: 2-1/4 turns out |
| Ignition system | |
| Type: | Transistorized magneto or CDI |
| Ignition timing: | 20° B.T.D.C |
| Spark plug: |
Flywheel magneto type: NGK: BM6A, BMR6A CDI: NGK: BPM6A, BPMR6A |
| Spark plug gap: |
Flywheel magneto type: 0.6-0.7 mm (0.024-0.028 in) CDI: 0.9-1.0 mm (0.035-0.039 in) |
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