Kawasaki FH451V

Kawasaki FH451VThe 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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2 Comments

  1. ***Help Please***
    We are small school and our maintenance man is telling u\s that he needs SYNTHETIC 15w20 TRANSMISSION FLUID for this Kawasaki FH451v ride-on lawn mower and of course we can’t find it anywhere. The research I’ve done does not indicate this engine requires transmission fluid, only oil. Does anyone know what he could possibly be referring to? (there is a language barrier) Administration has confirmed that we have only put synthetic fluid in the mower but they don’t know more than that.
    I believe he has already drained the fluid so we are in dire need of a solution, quick!
    Thank you in advance for any assistance you can offer.

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