The Kawasaki FJ400D is a 401 cc, (24.47 cu·in) single-cylinder, natural aspirated four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Kawasaki for general-purpose applications.
A 82.0 mm (3.23 in) cylinder bore and 76.0 mm (2.99 in) piston stroke give the FJ400D engine a total of 401 cc of displacement. The compression ratio rating is 8.2:1.
The Kawasaki FJ400D engine produced 13.2 PS (9.7 kW; 13.0 HP) at 3,600 rpm of maximum output power and 26.5 Nm (2.7 kg·m; 19.6 ft·lb) at 2,400 rpm of peak torque.
The Kawasaki FJ400D features:
- OHV (overhead valve) design
- Transistorized flywheel magneto ignition system
- Float type carburetor with fixed main jet (Nikki)
- Diaphragm type fuel pulse pump
- All speed mechanical fly weights governor
- Pressure feed lubrication by positive displacement pump
- Air-cooled cooling system
- Electric starter
General information
| Engine Specifications | |
| Engine model | FJ400D |
| Engine type | 4-stroke, OHV, single-cylinder |
| Displacement | 401 cm3, (24.47 cu·in) |
| Max. horsepower | 13.2 PS (9.7 kW; 13.0 HP) at 3,600 rpm |
| Max. torque | 26.5 Nm (2.7 kg·m; 19.6 ft·lb) at 2,400 rpm |
| Cooling system | Forced air cooling by fan |
| Air cleaner | – |
| Lubricating system | Pressure feed lubrication by positive displacement pump |
| Ignition system | Transistorized ignition |
| Fuel system | Float type carburetor with fixed main jet (Nikki) |
| Fuel tank capacity | – |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Electric starter |
| Governor | All speed mechanical governor |
| Charging system | 12V 20/30A with regulator |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 407 × 472 × 319 mm (16.0 × 18.6 × 12.6 in) |
| Dry weight | 31.5 kg (69.5 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 8.2:1 |
| Cylinder bore: | 82.0 mm (3.23 in) |
| Piston stroke: | 76.0 mm (2.99 in) |
| Cylinder internal diameter (standard): | 81.980-82.000 mm (3.2276-3.2283 in) |
| Piston skirt outer diameter (service limit): | 81.77 mm (3.2170 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod small end diameter (service limit): | 19.060 mm (0.7500 in) |
| Piston pin diameter (service limit): | 18.960 mm (0.7460 in) |
| Side clearance (Top): | 0.180 mm (0.0071 in) |
| Side clearance (Second): | 0.180 mm (0.0071 in)) |
| Ring end gap (Top): | 0.700 mm (0.0280 in) |
| Ring end gap (Second): | 0.800 mm (0.0310 in) |
| Ring end gap (Oil): | 1.000 mm (0.0390 in) |
| Ring thickness (Top): | 1.400 mm (0.0551 in) |
| Ring thickness (Second): | 1.400 mm (0.0551 in) |
| Crankshaft journal diameter (service limit): | Flywheel side: 34.978 mm (1.3770 in) |
| Cylinder head | |
| Valve arrangement: | OHV (overhead valves) |
| Valves: | 2 |
| Valve steam diameter (INTAKE): | 6.950 mm (0.2740 in) |
| Valve steam diameter (EXHAUST): | 6.930 mm (0.2730 in) |
| Valve seating surface angle (INTAKE): | 45° |
| Valve seating surface angle (EXHAUST): | 45° |
| Valve guide inside diameter (INTAKE): | 7.080 mm (0.2790 in) |
| Valve guide inside diameter (EXHAUST): | 7.080 mm (0.2790 in) |
| Valve spring free length (INTAKE): | 32.600 mm (1.2800 in) |
| Valve spring free length (EXHAUST): | 32.600 mm (1.2800 in) |
| Cam lobe height – service limit (INTAKE): | 29.860 mm (1.1760 in) |
| Cam lobe height – service limit (EXHAUST): | 29.860 mm (1.1760 in) |
| Exhaust valve lift by ACR: | 1.1 mm (0.043 in) |
| Camshaft journal diameter (service limit): | PTO side: 49.930 mm (1.9660 in0.) Flywheel side: 19.970 mm (0.7860 in) |
Tightening torque specs
| Tightening torque specs | Cylinder head bolts | 37.0 Nm; 3.8 kg·m; 27.0 ft·lb |
| Connecting rod big end cap bolts | 5.9 Nm; 0.6 kg·m; 4.4 ft·lb |
| Flywheel | 56.0 Nm; 5.7 kg·m; 41.0 ft·lb |
| Valve clearance lock screws | 6.9 Nm; 0.7 kgf·m; 5.1 lb·ft) |
| Rocker arm bolts | 28 Nm; 2.9 kg·m; 21.0 ft·lb |
| Spark plug | 22 Nm; 2.2 kg·m; 16.0 ft·lb |
Service Data
| Engine speed | |
| High idle speed: | 3,750±5 rpm |
| Low idle speed: | 1,125±75 rpm |
| Cylinder compression pressure | |
| Minimum: | 3.0 kg/cm2 (294 kPa, 43 psi) |
| Valve clearance | |
| Intake valve clearance: | 0.10-0.15 mm (0.0039-0.0059 in) |
| Exhaust valve clearance: | 0.10-0.15 mm (0.0039-0.0059 in) |
| Oil system | |
| Lubrication system: | Pressure feed lubrication by positive displacement pump |
| Oil filter: | Cartridge type full flow filter |
| Oil pressure switch | On/Off switch |
| Oil type, API: | SF, SG, SH or SJ class |
| Recommended oil viscosity, SAE: | SAE 40, SAE 30, SAE 10W-30/SAE 10W-40, or SAE 5W-20 |
| Oil capacity: | W/o filter changed: 1.1 liters (1.16 US.qts, 0.97 Imp. qts) With filter changed: 1.3 liters (1.37 US.qts, 1.14 Imp. qts) |
| Oil pressure: | Low Idle Speed (50°C): 196-343 kPa (2.0-3.5 kgf/cm2, 28-50 psi) High Idle Speed (70°C): 343-490 kPa (3.5-5.0 kgf/cm2, 50-71 psi) |
| Fuel system | |
| Type: | Float type carburetor with fixed main jet |
| Model: | NIKKI/6C1026-511 |
| Throttle bore diameter: | 26.0 mm (1.20 in) |
| Venturi diameter: | 20.0 mm (0.79 in) |
| Main jet: | #110 |
| Pilot jet: | #50 |
| Pilot screw: | 2 3/4±3/8 turns out |
| Float level: | Float parallel to carburetor body |
| Fuel pump: | Pulse-diaphragm pump |
| Ignition system | |
| Type: | Transistorized flywheel magneto ignition system |
| Spark plug: | NGK: BPR5ES |
| Spark plug gap: | 0.7-0.8 mm (0.028-0.031 in) |
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