The Kawasaki FX481V is a 0.6 l (603 cc, 36.8 cu-in) V-twin 90° air-cooled 4-stroke internal combustion small gasoline engine with vertical shaft, manufactured by Kawasaki Heavy Industries LTd., for general-purpose applications, commercial mowers, heavy-duty industrial and construction equipment.
The Kawasaki FX481V has V-twin design with vertical PTO shaft. The motor uses overhead V-valves; spherical combustion chamber; cast-iron cylinder liners; metal engine cover with integrated cleanout ports; rotating grass chopper screen. The engine is equipped with electronic spark ignition and internally vented carburetor with fuel shut-off solenoid. The motor uses a high-performance lubrication system and single or multi-stage canister air filter.
The engine has an automatic compression release (ACR) system with recoil or heavy-duty shift-type starter. 13A or 20A charge coils, muffler, oil pressure switches, and shaft variations are available as an option.
A 73.0 mm (2.87 in) cylinder bore and 72.0 mm (2.83 in) piston stroke give the motor a total of 603 cc, 36.8 cu-in of displacement. Compression ratio rating is 8.1:1. The FX481V engine produced 13.5 PS (9.9 kW; 13.3 HP) at 3,600 rpm or 15.8 PS (11.6 kW; 15.5 HP) at 3,600 rpm of maximum horsepower and 38.4 Nm (3.9 kg·m; 28.3 ft·lb) at 1,800 rpm or 42.6 Nm (4.3 kg·m; 31.4 ft·lb) at 1,800 rpm of torque.
General information
| Engine Specifications | |
| Model | FX481V |
| Type | 4-stroke, OHV, V-twin 90° |
| Displacement | 603 cm 3 (36.8 cu-in) |
| Max. horsepower |
13.5 PS (9.9 KW; 13.2 HP) at 3,600 rpm 15.8 PS (11.6 KW; 15.5 HP) at 3,600 rpm |
| Max. torque (crank PTO) |
38.4 Nm (3.9 kg·m; 28.3 ft·lb) at 1,800 rpm 42.6 Nm (4.3 kg·m; 31.4 ft·lb) at 1,800 rpm |
| Carburetor | Internally vented with fuel shut-off solenoid |
| Cooling system | Air-cooling |
| Ignition system | Electronic spark ignition |
| Lubricating system | High performance lubrication system |
| Starting system | Heavy duty shift type starter |
| Charging system | 13A or 20A charge coil (option) |
| Fuel used | Unleaded gasoline (octane number 91 or higher) |
| Fuel consumption | – |
| Cooling system | Pressurized forced circulation type |
Dimensions and Weight
| Kawasaki FX481V | |
| Length, mm (in) | 468 (18.4) |
| Width, mm (in) | 429 (16.9) |
| Height, mm (in) | 544 (21.4) |
| Dry weight, kg (lb) | 40.7 (89.7) |
Tightening torque specs
| Tightening torque specs | Cylinder head | 27.5 Nm; 2.75 kg·m; 20.3 ft·lb |
| Connecting rod | 10 Nm; 1.0 kg·m; 7.4 ft·lb |
| Flywheel | 56 Nm; 5.7 kg·m; 41.3 ft·lb |
| Crankcase cover | 27.5 Nm; 2.75 kg·m; 20.3 ft·lb |
| Intake manifold | 9 Nm; 0.9 kg·m; 6.6 ft·lb |
| Valve clearance lock nut | 11 Nm; 1.1 kg·m; 8.1 ft·lb |
Maintenance data
| Engine | |
| Maximum speed | 3500 ± 100 rpm |
| Idle speed | 1500 ± 100 rpm |
| Cylinder compression | 4.5 kg/cm2 (64 psi) at 500 rpm |
| Valve clearance | |
| Intake valve | 0.10-0.15 mm (0.004-0.006 in) |
| Exhaust valve | 0.10-0.15 mm (0.004-0.006 in) |
| Oil system | |
| Oil type | 4-stroke or an equivalent (SJ or higher class) |
| Recommended oil | SAE 10W-40, 10W-30 |
| Oil capacity (with filter changed) |
With oil filter: 2.1 litre Without oil filter: 1.8 litre |
| Ignition system | |
| Spark plug | NGK: BPR4ES |
| Spark plug gap | 0.7-0.8 mm (0.027-0.031 in) |
| Ignition coil air gap | 0.2-0.4 mm (0.008-0.011 in) |
| Spark plug tightening torque | 22 Nm; 2.2 kg·m; 16.2 ft·lb |
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