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Kawasaki FS481V Specifications
The Kawasaki FS481V is a 0.6 l (603 cc, 36.8 cubic inches) V-twin 90 deg 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 engine is equipped with 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 provide a total engine displacement of 603 cc, 36.8 cubic inches. Compression ratio rating is 8.1:1. The engine has a maximum power of 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 kgm; 28.34 ft-lb) at 1,800 rpm or 42.0 Nm (4.28 kgm; 31 ft-lb) at 1,800 rpm of max torque.
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- Kawasaki FS481V Engine Specifications
- Kawasaki FS481V Engine Maintenance
- Kawasaki FS481V Engine Troubleshooting
| General Technical Data |
Engine Model ............... Kawasaki FS481V
Engine Type ............... 4-cycle vertical shaft V-twin OHV air-cooled gasoline engine
Number of Cylinders ............... 2
Cylinder Liners ............... Cast iron
Displacement, cc (cu.in) ............... 603 (36.8)
Cylinder Bore, mm (in) ............... 73.0 (2.87)
Piston Stroke, mm (in) ............... 72.0 (2.84)
Rated Engine Power, hp (kW) ............... 13.5 (10.0)
Rated Engine Speed, rpm ............... 3600
Maximum Torque, Nm (ft-lb) ............... 38.4 (28.3)
Torque Speed, rpm ............... 1800
Compression Ratio ............... 8.1:1
Lubrication System ............... Pressure feed by positive displacement pump
Cooling System ............... Forced-air
Oil Filter Type ............... Cartridge, full flow
Ignition System ............... Electronic
Air Cleaner Type ............... Dual stage element
Starting System ............... Electric or recoil starter
Electrical System Rating, Volts ............... 12
| Fuel System |
Fuel System ............... Carburetor
Carburetor Type ............... Internally vented with fuel shut-off solenoid
Fuel Pump Type ............... Diaphragm pulse pump
Governor Type ............... Flyweight all speed governor
Fuel Type ............... Gasoline (86 or higher)
| Dimensions and Weight |
Overall Length, mm (in) ............... 484 (19.1)
Overall Width, mm (in) ............... 434 (17.2)
Overall Height, mm (in) ............... 377 (14.9)
Net weight, kg (lbs) ............... 36.7 (81.0)
| Cylinder Block |
Cylinder Inside Diameter (Max), mm (in) ............... 73.10 (2.878)
Cylinder Bore Out Round, mm (in) ............... 0.056 (0.0022)
Connecting Rod Small End Inside Diameter, mm (in) ............... 16.05 (0.632)
Connecting Rod Bend, mm (in) ............... 0.15/100 (0.006/3.94)
Connecting Rod Big End Width, mm (in) ............... 19.00 (0.748)
Crankpin Width, mm (in) ............... 40.0 (1.57)
Connecting Rod Big End Inside Diameter, mm (in) ............... 38.04 (1.50)
Crankpin Outside Diameter, mm (in) ............... 37.94 (1.49)
Crankshaft Runout, mm (in) ............... 0.05 (0.002)
Crankshaft Journal Diameter (PTO), mm (in) ............... 37.90 (1.492)
Crankshaft Journal Diameter (Flywheel), mm (in) ............... 34.90 (1.374)
Crankshaft Bearing Inside Diameter, mm (in) ............... 38.10 (1.500)
| Cylinder Head and Valves |
Cylinder Head Warp, mm (in) ............... 0.05 (0.002)
Valve Clearance (Intake, Exhaust), mm (in) ............... 0.10-0.15 (0.0040-0.0059)
Valve Seat Angle (Intake, Exhaust), deg ............... 45
Valve Seat Width (Intake), mm (in) ............... 0.8-1.4 (0.03-0.06)
Valve Seat Width (Exhaust), mm (in) ............... 0.8-1.4 (0.031-0.055)
Valve Guide Inside Diameter (Intake, Exhaust), mm (in) ............... 6.00-6.012 (0.2362-0.2367)
Valve Head Thickness (Intake, Exhaust), mm (in) ............... 0.35 (0.014)
Valve Stem Runout (Intake, Exhaust), mm (in) ............... 0.05 (0.002)
Valve Stem Diameter (Intake), mm (in) ............... 5.95 (0.234)
Valve Stem Diameter (Exhaust), mm (in) ............... 5.93 (0.233)
Valve Guide Inside Diameter (Intake, Exhaust), mm (in) ............... 6.08 (0.239)
Valve Spring Free Length (Intake, Exhaust), mm (in) ............... 31.0 (1.22)
Rocker Arm Push Rod Runout (Intake, Exhaust), mm (in) ............... 0.5 (0.02)
Cam Lobe Height, mm (in) ............... 29.621 (1.166)
| Piston and Piston Rings |
Piston Outside Diameter, mm (in) ............... 72.79 (2.866)
Top Ring Groove Clearance, mm (in) ............... 0.12 (0.0047)
Second Ring Groove Clearance, mm (in) ............... 0.12 (0.0047)
Piston Ring Thickness, mm (in) ............... 1.1 (0.043)
Top Ring End Gap, mm (in) ............... 0.7 (0.028)
Second Ring End Gap, mm (in) ............... 0.9 (0.035)
Oil Ring End Gap, mm (in) ............... 1.05 (0.041)
Piston Pin Outside Diameter, mm (in) ............... 15.96 (0.628)
Piston Pin Hole Inside Diameter, mm (in) ............... 16.08 (0.633)
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