Kawasaki FR651V

Kawasaki FR651VThe Kawasaki FR651V 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 FR651V has 90 degrees V-twin design with vertical PTO shaft, overhead valves, cast iron cylinder liners, and spherical combustion chamber, 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 FR651V produced 19.2 PS (14.1 kW; 18.8 HP) at 3,600 rpm or 21.8 PS (16.0 kW; 21.5 HP) at 3,600 rpm of maximum horsepower and 53.2 Nm (5.43 kg·m; 39.26 ft·lb) at 1,800 rpm or 53.3 Nm (5.44 kg·m; 39.34 ft·lb) at 2,200 rpm of torque.

General information

Engine Specifications
ModelFR651V
Type4-stroke, OHV, V-twin 90°
Displacement726 cm 3 (44.3 cu-in)
Max. horsepower 19.2 PS (14.1 KW; 18.8 HP) at 3,600 rpm
21.8 PS (16.0 KW; 21.5 HP) at 3,600 rpm
Max. torque (crank PTO) 53.2 Nm (5.43 kg·m; 39.26 ft·lb) at 1,800 rpm
53.3 Nm (5.44 kg·m; 39.34 ft·lb) at 2,200 rpm
CarburetorInternally vented with fuel shut-off solenoid
Cooling systemAir-cooling
Ignition systemElectronic spark ignition
Lubricating systemFull pressure with spin-on oil filter
Starting systemBendix type starter
Charging system13A or 20A charge coil (option)
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel consumption245 g/HPh
Cooling systemPressurized forced circulation type

Dimensions and Weight

Kawasaki FR651V
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 head46 Nm; 4.6 kg·m; 33.9 ft·lb
Connecting rod10 Nm; 1.0 kg·m; 7.4 ft·lb
Flywheel56 Nm; 5.7 kg·m; 41.3 ft·lb
Crankcase cover27.5 Nm; 2.75 kg·m; 20.3 ft·lb
Intake manifold9 Nm; 0.9 kg·m; 6.6 ft·lb
Oil drain plug7 Nm; 0.7 kg·m; 5.2 ft·lb
Valve clearance lock nut11 Nm; 1.1 kg·m; 8.1 ft·lb

Maintenance data

Engine
Maximum speed3500 ± 100 rpm
Idle speed1500 ± 100 rpm
Cylinder compression4.5 kg/cm2 (64 psi) at 500 rpm
Valve clearance
Intake valve0.10-0.15 mm (0.004-0.006 in)
Exhaust valve0.10-0.15 mm (0.004-0.006 in)
Oil system
Oil type4-stroke or an equivalent (SJ or higher class)
Recommended oilSAE 10W-40, 10W-30
Oil capacity (with filter changed) With oil filter: 2.1 litre
Without oil filter: 1.8 litre
Ignition system
Spark plugNGK: BPR4ES
Spark plug gap0.7-0.8 mm (0.027-0.031 in)
Ignition coil air gap0.2-0.4 mm (0.008-0.011 in)
Spark plug tightening torque22 Nm; 2.2 kg·m; 16.2 ft·lb
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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.

3 Comments

  1. If this motor has automatic compression release ,how can you check cylinder compression?
    I’ve checked it , and have 30 lbs left cylinder 90 lbs right cylinder

  2. please all I want to know is how much oil I should put in a Kawasaki 21.5 hp fr651v engine ?????????? one little question

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