The Kawasaki FX691V is a 0.73 l (726 cc, 44.3 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, commercial mowers, heavy-duty industrial and construction equipment.
The Kawasaki FX691V has V-twin design with vertical PTO shaft. The motor uses overhead V-valves; spherical combustion chamber; cast-iron cylinder liners; metal engine cover with integrated cleanout ports; rotating metal grass chopper screen. The engine is equipped with electronic spark ignition and internally vented carburetor with fuel shut-off solenoid. The motor uses a high-performance lubrication system and single or multi-stage canister air filter.
The engine has an automatic compression release (ACR) system with recoil or heavy-duty shift-type starter. 13A or 20A charge coils, muffler, oil pressure switches, and shaft variations are available as an option.
Cylinder bore and piston stroke are 78.0 mm (3.07 in) and 76.0 mm (2.99 in), respectively. Compression ratio rating is 8.2:1. The FX691V engine produced 20.9 PS (15.4 KW; 20.6 HP) at 3,600 rpm or 22.3 PS (16.4 KW; 22.0 HP) at 3,600 rpm of maximum horsepower and 53.7 Nm (5.5 kg·m; 39.6 ft·lb) at 2,000 rpm or 53.4 Nm (5.4 kg·m; 39.4 ft·lb) at 2,200 rpm of torque.
General information
| Engine Specifications | |
| Model | FX691V |
| Type | 4-stroke, OHV, V-twin 90° |
| Displacement | 726 cm 3 (44.3 cu-in) |
| Max. horsepower | 20.9 PS (15.4 KW; 20.6 HP) at 3,600 rpm 22.3 PS (16.4 KW; 22.0 HP) at 3,600 rpm |
| Max. torque (crank PTO) | 53.7 Nm (5.5 kg·m; 39.6 ft·lb) at 2,000 rpm 53.4 Nm (5.4 kg·m; 39.4 ft·lb) at 2,200 rpm |
| Carburetor | Internally vented with fuel shut-off solenoid |
| Cooling system | Air-cooling |
| Ignition system | Electronic spark ignition |
| Lubricating system | High performance lubrication system |
| Starting system | Heavy duty shift type starter |
| Charging system | 13A or 20A charge coil (option) |
| Fuel used | Unleaded gasoline (octane number 91 or higher) |
| Fuel consumption | – |
| Cooling system | Pressurized forced circulation type |
Dimensions and Weight
| Kawasaki FX691V | |
| Length, mm (in) | 479 (18.9) |
| Width, mm (in) | 462 (18.2) |
| Height, mm (in) | 565 (22.2) |
| Dry weight, kg (lb) | 46.0 (101.4) |
Tightening torque specs
| Tightening torque specs | Cylinder head | 46 Nm; 4.6 kg·m; 33.9 ft·lb |
| Connecting rod | 10 Nm; 1.0 kg·m; 7.4 ft·lb |
| Flywheel | 56 Nm; 5.7 kg·m; 41.3 ft·lb |
| Crankcase cover | 27.5 Nm; 2.75 kg·m; 20.3 ft·lb |
| Intake manifold | 9 Nm; 0.9 kg·m; 6.6 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 | 4.5 kg/cm2 (64 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 (SJ or higher class) |
| Recommended oil | SAE 10W-40, 10W-30 |
| Oil capacity (with filter changed) | With oil filter: 2.1 litre Without oil filter: 1.8 litre |
| Ignition system | |
| Spark plug | NGK: BPR4ES |
| Spark plug gap | 0.7-0.8 mm (0.027-0.031 in) |
| Ignition coil air gap | 0.2-0.4 mm (0.008-0.011 in) |
| Spark plug tightening torque | 22 Nm; 2.2 kg·m; 16.2 ft·lb |
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