Kawasaki FD851D DFI

Kawasaki FD851D DFIThe Kawasaki FD851D DFI is a 0.82 l (824 cc, 50.28 cu-in) V-twin 90° liquid-cooled 4-stroke internal combustion small gasoline motor with horisontal shaft, manufactured by Kawasaki Heavy Industries LTd., for general-purpose applications.

The FD851D DFI has OHV (overhead valve design); cast-iron cylinder liners; choke-free operation; electronic cold operation enrichment; electronic altitude compensation; multi-port digital fuel injection; high pressure electronic fuel pump; flywheel magneto transistor ignition or electronic ignition with spark advancement; mechanical governor; low tone muffler and compact electronic control unit. The Kawasaki FD851D DFI uses a full pressure lubrication system with spin-on oil filter and dual element air cleaner.

The engine was equipped with solenoid shift-type electric starter and 12V-20A or 30A charging coil with a regulator.

The Kawasaki FD851D DFI producted 27.2 PS (20.0 KW; 26.8 HP) at 3,600 rpm or 31.4 PS (23.1 KW; 31 HP) at 3,600 rpm of maximum horsepower and 59.0 Nm (6.02 kg·m; 43.54 ft·lb) at 2,400 rpm or 63.9 Nm (6.52 kg·m; 47.16 ft·lb) at 3,200 rpm of torque. It has an 82.0 mm (3.23 in) cylinder bore and 78.0 mm (3.07 in) piston stroke.

General information

Engine Specifications
Model FD851D DFI
Type 4-stroke, OHV, V-twin 90°
Displacement 845 cm 3 (50.3 cu-in)
Max. horsepower 27.2 PS (20.0 KW; 26.8 HP) at 3,600 rpm
31.4 PS (23.1 KW; 31.0 HP) at 3,600 rpm
Max. torque (crank PTO) 59.0 Nm (6.02 kg·m; 43.54 ft·lb) at 2,400 rpm
63.9 Nm (6.52 kg·m; 47.16 ft·lb) at 3,200 rpm
Carburetor Multi port digital fuel injection
Cooling system Liquid-cooling
Ignition system Transistorized ignition
Lubricating system Pressurized lubrication system
Starting system Electric starter
Charging system 12 Volt – 20A or 30A with regulator
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel consumption 230 g/HPh
Cooling system Pressurized forced circulation type

Dimensions and Weight

Kawasaki FD851D DFI
Length, mm (in) 523 (20.6)
Width, mm (in) 451 (17.8)
Height, mm (in) 713 (28.1)
Dry weight, kg (lb) 57.5 (126.8)

Tightening torque specs

Tightening torque specs
Cylinder head 27 Nm; 2.7 kg·m; 20 ft·lb
Connecting rod 21 Nm; 2.1 kg·m; 15.5 ft·lb
Flywheel 56 Nm; 5.5 kg·m; 41 ft·lb
Crankcase cover 22 Nm; 2.2 kg·m; 16.2 ft·lb
Intake manifold 12 Nm; 1.2 kg·m; 9 ft·lb
Oil drain plug 25 Nm; 2.5 kg·m; 18.5 ft·lb
Valve clearance lock nut 11 Nm; 1.1 kg·m; 8 ft·lb

Maintenance data

Maximum speed 3500 ± 100 rpm
Idle speed 1500 ± 100 rpm
Cylinder compression 7.5 kg/cm2 (107 psi) at 500 rpm
Valve clearance
Intake valve 0.15 mm (0.006 in)
Exhaust valve 0.15 mm (0.006 in)
Oil system
Oil type 4-stroke or an equivalent (SC, SD, SE, SF, SG, or SH)
Recommended oil SAE 10W-40, 10W-30, 5W-20
Oil capacity (with filter changed) 1.8-2.0 L (1.9-2.1 US qt)
Ignition system
Spark plug NGK: BPR2ES
Spark plug gap 0.75 mm (0.03 in)
Spark plug tightening torque 25 Nm; 2.5 kg·m; 18.5 ft·lb
Ignition coil air gap 0.25-0.40 mm (0.009-0.015 in)
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