The Kawasaki FH721D is a 0.68 l (675 cc, 41.19 cu-in) V-twin 90° air-cooled 4-stroke internal combustion small gasoline motor with horisontal shaft, manufactured by Kawasaki Heavy Industries LTd., for general-purpose applications.
The FH721D has OHV (overhead valve design); cast-iron cylinder liners; twin-barrel, float type carburetor with fixed main jet; pulse type fuel pump; flywheel magneto transistor type ignition system; mechanical governor and low tone muffler.
The Kawasaki FH721D uses a full pressure lubrication system with spin-on oil filter and dual element air cleaner. The engine was equipped with BENDIX type electric starter and 12V-13A charging coil with a regulator.
The Kawasaki FH721D develops 25.3 PS (18.6 kW; 25.0 HP) at 3,600 rpm and 56.0 Nm (5.7 kg·m; 41.3 ft·lb) at 2,400 rpm of torque. It has a 75.2 mm (2.96 in) cylinder bore and 76.0 mm (2.99 in) piston stroke. Compression ratio rating is 8.1:1.
|Type||4-stroke, OHV, V-twin 90°|
|Displacement||675 cm 3 (41.2 cu-in)|
|Max. horsepower||25.3 PS (18.6 KW; 25.0 HP) at 3,600 rpm|
|Max. torque (crank PTO)||56.0 Nm (5.7 kg·m; 41.3 ft·lb) at 2,400 rpm|
|Carburetor||Twin barrel, float type|
|Ignition system||Flywheel magneto transistor type|
|Lubricating system||Full pressure with spin-on oil filter|
|Starting system||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
|Length, mm (in)||447.5 (17.6)|
|Width, mm (in)||430 (16.9)|
|Height, mm (in)||492 (19.4)|
|Dry weight, kg (lb)||44.0 (97.0)|
Tightening torque specs
|Tightening torque specs||Cylinder head||28 Nm; 2.8 kg·m; 20.6 ft·lb|
|Connecting rod||10 Nm; 1.0 kg·m; 7 ft·lb|
|Flywheel||56 Nm; 5.7 kg·m; 41.3 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|
|Maximum speed||3500 ± 100 rpm|
|Idle speed||1500 ± 100 rpm|
|Cylinder compression||3.9 kg/cm2 (56 psi) at 500 rpm|
|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 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)||1.6 L|
|Spark plug||NGK: BPR4ES|
|Spark plug gap||0.75 mm (0.029 in)|
|Spark plug tightening torque||22 Nm; 2.2 kg·m; 16.2 ft·lb|
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.
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