Kawasaki FH531V

Kawasaki FH531VThe Kawasaki FH531V 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 FH531V has V-twin 90° design with vertical PTO shaft 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 a flywheel magneto transistor type 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 with 12V-13A charging coil.

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 FH531V produced 18.2 PS (13.4 kW; 18.0 HP) at 3,600 rpm of maximum horsepower and 39.0 Nm (3.98 kg·m; 28.78 ft·lb) at 2,400 rpm of torque.

General information

Engine Specifications
Type4-stroke, OHV, V-twin 90°
Displacement494 cm 3 (30.15 cu-in)
Max. horsepower18.2 PS (13.4 KW; 18.0 HP) at 3,600 rpm
Max. torque (crank PTO)39.0 Nm (3.98 kg·m; 28.78 ft·lb) at 2,400 rpm
CarburetorFloat type
Cooling systemAir-cooling
Ignition systemFlywheel magneto transistor type
Lubricating systemFull pressure with spin-on oil filter
Starting systemRecoil or electric starter
Charging system12V-13A with regulator
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel consumption245 g/HPh
Cooling systemPressurized forced circulation type

Dimensions and Weight

Kawasaki FH531V
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 head25 Nm; 2.2 kg·m; 18.5 ft·lb
Connecting rod6 Nm; 0.6 kg·m; 4.4 ft·lb
Flywheel56 Nm; 5.7 kg·m; 41.3 ft·lb
Crankcase cover25 Nm; 2.2 kg·m; 18.5 ft·lb
Intake manifold6 Nm; 0.6 kg·m; 4.4 ft·lb
Valve clearance lock nut7 Nm; 0.7 kg·m; 5.1 ft·lb

Maintenance data

Maximum speed3500 ± 100 rpm
Idle speed1500 ± 100 rpm
Cylinder compression4.0 kg/cm2 (56 psi) at 500 rpm
Valve clearance
Intake valve0.10-0.15 mm (0.004-0.006 in)
Exhaust valve0.10-0.15 mm (0.004-0.006 in)
Oil system
Oil type4-stroke or an equivalent (SF, SG, SH, or SJ )
Recommended oilSAE 10W-40, 10W-30, 5W-20
Oil capacity (with filter changed)1.8 litre (1.9 US.qt.)
Ignition system
Spark plug gap0.75 mm (0.029 in)
Spark plug tightening torque22 Nm; 2.2 kg·m; 16.2 ft·lb
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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.


  1. I am trying to find a diagram or image for the correct choke linkage hookup between the carburetor and the cable transfer mechanism. It fell off during a carb replacement and for the life of me I can’t figure out how to make the proper connection. Looked everywhere online but no luck. The only place it actually fits appears to be the throttle lever. Any help would be appreciated.

    • Hi there David, just wondering why you replaced the carby? Was it because it was surging at idael cause mine is doing that now, when I’m mowing it does it a little but when I stop to empty the catchers the motor surge up and down. Today I’m replacing fuel filter, oil, oil filter also the two spark plugs. Not sure on what else I can do with out going inside of it. What do you think??? Any help would be appreciated cliff.

      • Often, the idle air bleed holes located in the venturi (or throat) of the carburetor directly behind the air filter, become restricted with dirt and require cleaning. This will cause unsteady and loping idle. I clean mine with a spray of carburetor cleaner and compressed air. Solves the same problem on more engine brands than just Kawi.

  2. I have a Kawasaki motor FH531V-DS06 dated 2007 in my mower. The odd thing is, that NOWHERE on the Web can I find reference to that SPEC for a FH531V engine. The sticker clearly states it. The Web shows “BS06”, but no “DS06”. What’s wrong?

    I want to get the correct engine manual but cannot make a move until I am sure of the SPEC.

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