Honda GV400

Honda GV400The 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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