The Kawasaki FR541V 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 residential zero-turn mowers, lawn and garden tractors.
The FR541V has 90 degrees V-twin design with vertical PTO shaft, overhead valves, cast iron cylinder liners, and spherical combustion chamber. The engine is equipped with the electronic spark ignition system and internally vented carburetor with fuel shut-off solenoid. The motor uses a high-performance lubrication system and single-stage air filter.
The engine has an automatic compression release (ACR) system with bendix type starter. 13A or 20A charge coils 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 FR541V produced 15.3 PS (11.3 kW; 15.1 HP) at 3,600 rpm or 15.2 PS (11.2 kW; 15.0 HP) at 3,600 rpm of maximum horsepower and 39.1 Nm (4.0 kg·m; 28.9 ft·lb) at 2,200 rpm or 43.0 Nm (4.39 kg·m; 31.73 ft·lb) at 2,000 rpm of torque.
General information
| Engine Specifications | |
| Model | FR541V |
| Type | 4-stroke, OHV, V-twin 90° |
| Displacement | 603 cm 3 (36.8 cu-in) |
| Max. horsepower |
17.3 PS (12.7 KW; 17.0 HP) at 3,600 rpm 15.2 PS (11.2 KW; 15.0 HP) at 3,600 rpm |
| Max. torque (crank PTO) |
39.1 Nm (4.0 kg·m; 28.9 ft·lb) at 2,200 rpm 43.0 Nm (4.4 kg·m; 31.7 ft·lb) at 2,000 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 | 245 g/HPh |
| Cooling system | Pressurized forced circulation type |
Dimensions and Weight
| Kawasaki FR541V | |
| Length, mm (in) | 482 (19.0) |
| Width, mm (in) | 429 (16.9) |
| Height, mm (in) | 370 (14.6) |
| 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
| 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 Withuot 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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