Kawasaki FR691V

The Kawasaki FR691V 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 residential zero-turn mowers, lawn and garden tractors.

The FR691V has 90 degrees V-twin design with vertical PTO shaft, overhead valves, cast iron cylinder liners, spherical combustion chamber and rotating metal grass chopper screen. The engine is equipped with the electronic spark ignition system and internally vented carburetor with fuel shut-off solenoid. The motor uses a high-performance lubrication system and single-stage air filter.

The engine has an automatic compression release (ACR) system with bendix type starter. 13A or 20A charge coils are available as an option.

It has a 78.0 mm (3.07 in) cylinder bore and 76.0 mm (2.99 in) piston stroke. Compression ratio rating is 8.2:1. The Kawasaki FR691V produced 20.9 PS (15.4 kW; 20.6 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 53.6 Nm (5.5 kg·m; 39.6 ft·lb) at 2,000 rpm of torque.

General information

Engine Specifications
Model	FR691V
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 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 53.6 Nm (5.5 kg·m; 39.6 ft·lb) at 2,000 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	245 g/HPh
Cooling system	Pressurized forced circulation type

Dimensions and Weight

	Kawasaki FR691V
Length, mm (in)	501 (19.7)
Width, mm (in)	466 (18.3)
Height, mm (in)	392 (15.4)
Dry weight, kg (lb)	40.0 (88.2)

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: 1.7 litre Without oil filter: 1.5 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