The 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
Model
FD731V
Type
4-stroke, OHV, V-twin 90°
Displacement
675 cm 3 (41.19 cu-in)
Max. horsepower
26.4 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
Carburetor
Twin barrel, internally vented
Cooling system
Liquid-cooling
Ignition system
Electronic spark
Lubricating system
Pressure feed lubrication system
Starting system
Electric starter
Charging system
High Amp charging coil
Fuel used
Unleaded gasoline (octane number 86 or higher)
Fuel consumption
245 g/HPh
Cooling system
Pressurized 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 head
32 Nm; 3.2 kg·m; 23.6 ft·lb
Connecting rod
9.8 Nm; 1.0 kg·m; 7.2 ft·lb
Flywheel
56 Nm; 5.6 kg·m; 41 ft·lb
Crankcase cover
21 Nm; 2.1 kg·m; 15.5 ft·lb
Intake manifold
6 Nm; 6.0 kg·m; 4.4 ft·lb
Oil drain plug
7 Nm; 0.7 kg·m; 5.2 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
7.0 kg/cm2 (99 psi) at 500 rpm
Valve clearance
Intake valve
0.15 mm (0.006 in)
Exhaust valve
0.15 mm (0.006 in)
Oil system
Oil type
4-stroke or an equivalent (SC, SD, SE, SF, SG, or SH)
Recommended oil
SAE 10W-40, 10W-30, 5W-20
Oil capacity (with filter changed)
2.0-2.3 L
Ignition system
Spark plug
NGK: BPR2ES
Spark plug gap
0.75 mm (0.029 in)
Spark plug tightening torque
25 Nm; 2.5 kg·m; 18.4 ft·lb
Author:Sergei WersAbout: 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.
25 Comments
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?
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
I have a 2005 Hustler Super-Z 60in cut with a FD731V 26HP Liquid Cooled, only 504 hours. Runs strong, no oil burner. Will sell entire mower for $2,500.
Can negotiate delivery from Minn. [email protected]
I am a Small Engine business and work on everything. I found out that the FD731V is NLA. I had to get a little bigger engine to go on a Gravely Z steer
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
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.
The 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. 
Author:
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?
Hi there;
I am looking for a Kawasaki engine FD731V 26 HP for my Hustler Super Z mower.
Thanks;
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
How can I go about purchasing one of the new ones?
I need 1 or 2 of the Fd731v engines.
Please email me a price on 1 or 2 engines
Please email me at [email protected] would be interested in a new fv731d
I will take one and use the carburetor off of my old one
i want one –my email address is [email protected]–tel # 318 680 6346
Are these still available?
looking for 26 hp kaw
I have a 2005 Hustler Super-Z 60in cut with a FD731V 26HP Liquid Cooled, only 504 hours. Runs strong, no oil burner. Will sell entire mower for $2,500.
Can negotiate delivery from Minn. [email protected]
I am a Small Engine business and work on everything. I found out that the FD731V is NLA. I had to get a little bigger engine to go on a Gravely Z steer
What engine did you use to replace the Kawasaki? I have 2,800 hrs on mine and I’m losing power
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
do you still have any of the Kawasaki FD731V engines remaining? if so, where are you and how much do you want for one… or two? thank you
Please let me know if you have any left and the price, I need a block, any idea where I could locate one
Are these available
[email protected]
I would love to have 1 or 2 of the engines.
What would you need to get for one or two?
I would also be interested in 1
Let me know how much
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.
Let me know how much you want for the eng.
i would be interested in this
Do you still have the fd731v engine? Thanks
@Bobby Davis Sr. Im in Alabama and if its still avalible call me at two5six 68nine 908one thanks