The Kawasaki FS691V 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, such as zero-turn riders, lawn and garden tractors and wide-area walk-behind mowers.
The FS691V has 90 degrees V-twin design with vertical PTO shaft, overhead V-valves, cast iron cylinder liners, and spherical combustion chamber. The engine is equipped with the electronic spark ignition system, internally vented carburetor with fuel shut-off solenoid, rotating grass chopper screen, integrated clean out ports. The motor uses a high-performance lubrication system and dual-element air filter.
The engine has an automatic compression release (ACR) system with bendix type starter. 13A or 20A charge coils, muffler, oil pressure switches, various oil drains are available as an option.
Bore and stroke are 78.0 mm (3.07 in) and 76.0 mm (2.99 in), respectively. Compression ratio rating is 8.2:1. The Kawasaki FS691V produced 20.9 PS (15.4 kW; 20.7 HP) at 3,600 rpm or 23.4 PS (17.2 kW; 23.0 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 54.1 Nm (5.5 kg·m; 39.9 ft·lb) at 2,200 rpm of torque.
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General information
| Engine Specifications | |
| Model | FS691V |
| Type | 4-stroke, OHV, V-twin 90° |
| Displacement | 726 cm 3 (44.3 cu-in) |
| Max. horsepower |
20.9 PS (15.4 KW; 20.7 HP) at 3,600 rpm 23.4 PS (17.2 KW; 23.0 HP) at 3,600 rpm |
| Max. torque (crank PTO) |
53.7 Nm (5.5 kg·m; 39.6 ft·lb) at 2,000 rpm 54.1 Nm (5.5 kg·m; 39.9 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 | Full pressure with spin-on oil filter |
| Starting system | Bendix type starter |
| Charging system | 13A or 20A charge coil (option) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel consumption | – |
| Cooling system | Pressurized forced circulation type |
Dimensions and Weight
| Kawasaki FS691V | |
| Length, mm (in) | 500 (19.7) |
| Width, mm (in) | 471 (18.5) |
| Height, mm (in) | 391 (15.4) |
| Dry weight, kg (lb) | 41.0 (90.4) |
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 |
| 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 | 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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