The Honda GV400 is a 406 cc (24.8 cu.in.) single-cylinder air-coolled 4-stroke internal combustion small gasoline engine with vertical shaft manufactured by Honda Motor Company.
The Honda GV400 engine has a slide valve (L-head) design and camshaft driven by a single row chain driven by the crankshaft. The engine has an electric or recoil starter, horizontal carburetor with butterfly valve, and flywheel magneto or capacitor discharge ignition (CDI) system. The engine is equipped with a dual-element air cleaner, a centrifugal governor, and a trochoid oil pump.
The GV400 engine’s compression ratio rating is 6.5:1, cylinder bore and piston stroke are 86.0 mm (3.4 in) and 70.0 mm (2.80 in), respectively.
The Honda GV400 produced 11.0 HP (8.2 kW) at 3,600 rpm of maximum horsepower and 24.5 Nm (24.5 kg·m, 17.7 ft·lb) at 3,000 rpm of torque.
General information
| Engine Specifications | |
| Model | GV400 |
| Type | 4-stroke, side valve type (L-head), single cylinder |
| Displacement | 406 cm 3 (24.8 cu-in) |
| Horsepower | 11.0 HP (8.2 kW) at 3,600 rpm |
| Torque | 24.5 Nm (24.5 kg·m, 17.7 ft·lb) at 3,000 rpm |
| Carburetor | Horizontal, butterfly valve |
| Cooling system | Forced-air |
| Ignition system | Transistorized magneto or CDI |
| Lubricating system | Trochoid oil pump |
| Starting system | Recoil starter or electric starter |
| Stoping system | Ground of primary circuit |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 2.3 L (2.43 US qt, 2.02 Imp qt.) |
| Fuel consumption | 270 g/HPh |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Cylinder Block and Head
The piston has two compression rings and one oil ring. Precision camshaft design offers precise valve timing and optimal valve overlap for better fuel efficiency.
| Cylinder block | ||
| Compression ratio: | 6.5:1 | |
| Bore x Stroke | 86 X 70 mm (3.4 x 2.8 in) | |
| Sleeve internal diameter | 86.00 mm (2.386 in) | |
| Piston skirt outer diameter | 85.97-86.00 mm (3.385-3.386 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Ring side clearance | Top | 0.02-0.06 mm (0.0008-0.00024 in) |
| Second/oil | 0.01-0.05 mm (0.0004-0.0020 in) | |
| Ring end gap | Top/second | 0.20-0.40 mm (0.008-0.016 in) |
| Oil | 0.20-0.40 mm (0.008-0.016 in) | |
| Connecting rod small end ID | 19.005-19.020 mm (0.7482-0.7488 in) | |
| Crankshaft crank pin outer diameter | 36.951-36.958 mm (1.4548-1.4550 in) | |
| Cylinder Head | ||
| Warpage (limit) | 0.10 mm (0.004 in) | |
| Valve Arrangement: | Side valve (L-head) | |
| Valves: | 2 | |
| Stem outer diameter (standard): | INTAKE | 6.955-6.970 mm (0.2738-0.2744 in) |
| EXHAUST | 6.910-6.925 mm (0.2720-0.2726 in) | |
| Cam height: | INTAKE | 38.5-38.7 mm (1.516-1.524 in) |
| EXHAUST | 38.5-38.7 mm (1.516-1.524 in) | |
| Valve spring free length: | 42.7 mm (1.68 in) | |
MAINTENANCE DATA
| Engine | |
| Idle speed | 1700 ± 150 rpm |
| Cylinder compression | 8.0 kg/cm2 at 1400 rpm |
| Valve clearance | |
| Intake valve | 0.06-0.12 mm (0.002-0.005 in) |
| Exhaust valve | 0.09-0.15 mm (0.004-0.006 in) |
| Carburetor | |
| Main jet | #105 |
| Float height | 6.7-9.7 mm (0.26-0.38 in) |
| Pilot screw opening | K0:1-1/2; K1:2-1/4 turns |
| Oil system | |
| Oil type | Honda 4-stroke or an equivalent (SG.SF/CC.CD) |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 1.2 L (2.54 US pt, 2.11 lmp pt) |
| Ignition system | |
| Ignition timing | 20 ° B.T.D.C (Fixed) |
| 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) |
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 |
Author:
I NEED A BOLT & WASHER TO FIT THE END OF A GV 400 CRANK SHAFT THAT HOLDS THE KEY INTO THE V BELT PULL.
REGARDS TREVOREY
need a carburetor for gv400 ADAA- part number 16100891073-bb38A-h. No one sales replacement for this engine so i need a used one off another engine.