Kawasaki FS481V

Kawasaki FS481VThe Kawasaki FS481V 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, such as zero-turn riders, lawn and garden tractors and wide-area walk-behind mowers.

The FS481V has 90 degrees V-twin design with vertical PTO shaft, overhead V-valves, cast iron cylinder liners, spherical combustion chamber, rotating grass screen and integrated clean out ports. The engine is equipped with electronic spark ignition system, internally vented carburetor with fuel shut-off solenoid. The motor uses a high-performance lubrication system and dual-element air filter.

The engine has an automatic compression release (ACR) system with bendix type starter. 13A or 20A charge coils, muffler, oil pressure switches, various oil drains 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 Kawasaki FS481V produced 13.5 PS (9.9 kW; 13.2 HP) at 3,600 rpm or 14.7 PS (10.8 kW; 14.5 HP) at 3,600 rpm of maximum horsepower and 38.4 Nm (3.92 kg·m; 28.34 ft·lb) at 1,800 rpm or 42.0 Nm (4.28 kg·m; 31 ft·lb) at 1,800 rpm of torque.

General information

Engine Specifications
Model FS481V
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
14.7 PS (10.8 KW; 14.5 HP) at 3,600 rpm
Max. torque (crank PTO) 38.4 Nm (3.92 kg·m; 28.34 ft·lb) at 1,800 rpm
42.0 Nm (4.28 kg·m; 31 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 Full pressure with spin-on oil filter
Starting system Bendix type starter
Charging system 13A or 20A charge coil (option)
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel consumption
Cooling system Pressurized forced circulation type

Dimensions and Weight

Kawasaki FS481V
Length, mm (in) 484 (19.1)
Width, mm (in) 434 (17.1)
Height, mm (in) 377 (14.8)
Dry weight, kg (lb) 36.7 (80.9)

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

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: 1.7 litre
Without oil filter: 1.5 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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1 Comment

  1. Your specs all seem to be correct. I used them to rebuild a 481. Started right up first pull. Retorqued head bolts after it cooled down.

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