Kawasaki FD731V

Kawasaki FD731VThe Kawasaki FD731V is a 0.68 l (675 cc, 41.19 cu-in) V-twin 90° liquid-cooled 4-stroke internal combustion small gasoline motor with vertical shaft, manufactured by Kawasaki Heavy Industries LTd., for general-purpose applications.

The FD731V has OHV (overhead V-valves) design; cast-iron cylinder liners; twin-barrel, internally vented carburetor with fuel shut-off solenoid; electronic spark ignition system. The engine uses a full pressure lubrication system with oil pressure switch and dual-element air cleaner.

The Kawasaki FD731V develops 26.4 PS (19.4 kW; 26.0 HP) at 3,600 rpm and 57.7 Nm (5.9 kg·m; 42.6 ft·lb) at 2,400 rpm of torque. It has a 72.5 mm (2.85 in) cylinder bore and 76 mm (2.99 in) piston stroke. Compression ratio rating is 8.5:1.

General information

Engine Specifications
Type4-stroke, OHV, V-twin 90°
Displacement675 cm 3 (41.19 cu-in)
Max. horsepower26.4 PS (19.4 KW; 26.0 HP) at 3,600 rpm
Max. torque (crank PTO)57.7 Nm (5.9 kg·m; 42.6 ft·lb) at 2,400 rpm
CarburetorTwin barrel, internally vented
Cooling systemLiquid-cooling
Ignition systemElectronic spark
Lubricating systemPressure feed lubrication system
Starting systemElectric starter
Charging systemHigh Amp charging coil
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel consumption245 g/HPh
Cooling systemPressurized forced circulation type

Dimensions and Weight

Kawasaki FD731V
Length, mm (in)471 (18.5)
Width, mm (in)562 (22.1)
Height, mm (in)384 (15.1)
Dry weight, kg (lb)45.0 (99.2)

Tightening torque specs

Tightening torque specs
Cylinder head32 Nm; 3.2 kg·m; 23.6 ft·lb
Connecting rod9.8 Nm; 1.0 kg·m; 7.2 ft·lb
Flywheel56 Nm; 5.6 kg·m; 41 ft·lb
Crankcase cover21 Nm; 2.1 kg·m; 15.5 ft·lb
Intake manifold6 Nm; 6.0 kg·m; 4.4 ft·lb
Oil drain plug7 Nm; 0.7 kg·m; 5.2 ft·lb
Valve clearance lock nut11 Nm; 1.1 kg·m; 8.1 ft·lb

Maintenance data

Maximum speed3500 ± 100 rpm
Idle speed1500 ± 100 rpm
Cylinder compression7.0 kg/cm2 (99 psi) at 500 rpm
Valve clearance
Intake valve0.15 mm (0.006 in)
Exhaust valve0.15 mm (0.006 in)
Oil system
Oil type4-stroke or an equivalent (SC, SD, SE, SF, SG, or SH)
Recommended oilSAE 10W-40, 10W-30, 5W-20
Oil capacity (with filter changed)2.0-2.3 L
Ignition system
Spark plugNGK: BPR2ES
Spark plug gap0.75 mm (0.029 in)
Spark plug tightening torque25 Nm; 2.5 kg·m; 18.4 ft·lb
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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  1. I have got 3 fd731 kawasaki engines in hustler mowers. I am going through clutches. I’ve ordered a xtreme clutch and it said to check at the battery the output on Amps. Its supposed to be between 13.5 and 14. All 3 are putting out 14.3 to 15.3. Is this normal for these engines?

  2. I know where there 15 that’s brand new the only thing is there all setup to run on propane a new carburetor will cost u $350, what would you be willing to pay for one

  3. I have a 2005 Hustler Super-Z 60-inch cut, special seat, with a Kaw. FD731V 26-HP Liquid Cooled, runs strong, no oil burner.
    Has only 504 hours, new blades 100 hours. Willing to sell the entire mower for
    $2,500 firm. Can send photos via E-mail. Can trailer it from Minnesota ?$?.

    • Im down south in Ms.but if anybody is intrested,i have a complete FD731V engine ,with exhaust,air cleaner ,radiator,i mean everything is still together on this engine.i ended up with it when i purchased the inventory of a shop that was closeing.i was amazed at the very site of it ,but i dont have much use for it.im open for reasonable offers.

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