The Kawasaki FH451V is a 0.49 l (494 cc, 30.15 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.
The FH451V has vertical PTO shaft; V-twin 90° design with cast iron cylinder liners and overhead valves (OHV). The engine is equipped with float type carburetor with a fixed main jet and pulse type fuel pump. The motor uses an electronic spark ignition system; full pressure lubrication system with spin-on oil filter and dual element air cleaner.
The engine has an automatic compression release (ACR) system with recoil or electric starter (12V solenoid shift starter or bendix starter are available as an option).
It has a 68.0 mm (2.68 in) cylinder bore and 68.0 mm (2.68 in) piston stroke. Compression ratio rating is 8.5:1. The Kawasaki FH451V produced 15.2 PS (11.2 kW; 15.0 HP) at 3,600 rpm of maximum horsepower and 34.6 Nm (3.5 kg·m; 25.5 ft·lb) at 2,400 rpm of torque.
General information
| Engine Specifications | |
| Model | FH451V |
| Type | 4-stroke, OHV, V-twin 90° |
| Displacement | 494 cm 3 (30.15 cu-in) |
| Max. horsepower | 15.2 PS (11.2 KW; 15.0 HP) at 3,600 rpm |
| Max. torque (crank PTO) | 34.6 Nm (3.5 kg·m; 25.5 ft·lb) at 2,400 rpm |
| Carburetor | Float type |
| Cooling system | Air-cooling |
| Ignition system | Electronic spark ignition |
| Lubricating system | Full pressure with spin-on oil filter |
| Starting system | Recoil or electric starter |
| Charging system | 12 Volt – 13A with regulator |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel consumption | 245 g/HPh |
| Cooling system | Pressurized forced circulation type |
Dimensions and Weight
| Kawasaki FH451V | |
| Length, mm (in) | 425 (16.7) |
| Width, mm (in) | 359 (14.1) |
| Height, mm (in) | 441 (17.4) |
| Dry weight, kg (lb) | 32 (70.5) |
Tightening torque specs
| Tightening torque specs | Cylinder head | 25 Nm; 2.2 kg·m; 18.5 ft·lb |
| Connecting rod | 6 Nm; 0.6 kg·m; 4.4 ft·lb |
| Flywheel | 56 Nm; 5.7 kg·m; 41.3 ft·lb |
| Crankcase cover | 25 Nm; 2.2 kg·m; 18.5 ft·lb |
| Intake manifold | 6 Nm; 0.6 kg·m; 4.4 ft·lb |
| Valve clearance lock nut | 7 Nm; 0.7 kg·m; 5.1 ft·lb |
Maintenance data
| Engine | |
| Maximum speed | 3500 ± 100 rpm |
| Idle speed | 1500 ± 100 rpm |
| Cylinder compression | 4.0 kg/cm2 (56 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 (SF, SG, SH, or SJ ) |
| Recommended oil | SAE 10W-40, 10W-30, 5W-20 |
| Oil capacity (with filter changed) | 1.8 litre (1.9 US.qt.) |
| Ignition system | |
| Spark plug | CHAMPION: RCJ8Y; NGK: BPMR6A |
| Spark plug gap | 0.75 mm (0.029 in) |
| Spark plug tightening torque | 22 Nm; 2.2 kg·m; 16.2 ft·lb |
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