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
ModelFD851D DFI
Type4-stroke, OHV, V-twin 90°
Displacement845 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
CarburetorMulti port digital fuel injection
Cooling systemLiquid-cooling
Ignition systemTransistorized ignition
Lubricating systemPressurized lubrication system
Starting systemElectric starter
Charging system12 Volt – 20A or 30A with regulator
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel consumption230 g/HPh
Cooling systemPressurized 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 head27 Nm; 2.7 kg·m; 20 ft·lb
Connecting rod21 Nm; 2.1 kg·m; 15.5 ft·lb
Flywheel56 Nm; 5.5 kg·m; 41 ft·lb
Crankcase cover22 Nm; 2.2 kg·m; 16.2 ft·lb
Intake manifold12 Nm; 1.2 kg·m; 9 ft·lb
Oil drain plug25 Nm; 2.5 kg·m; 18.5 ft·lb
Valve clearance lock nut11 Nm; 1.1 kg·m; 8 ft·lb

Maintenance data

Maximum speed3500 ± 100 rpm
Idle speed1500 ± 100 rpm
Cylinder compression7.5 kg/cm2 (107 psi) at 500 rpm
Valve clearance
Intake valve0.15 mm (0.006 in)
Exhaust valve0.15 mm (0.006 in)
Oil system
Oil type4-stroke or an equivalent (SC, SD, SE, SF, SG, or SH)
Recommended oilSAE 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 plugNGK: BPR2ES
Spark plug gap0.75 mm (0.03 in)
Spark plug tightening torque25 Nm; 2.5 kg·m; 18.5 ft·lb
Ignition coil air gap0.25-0.40 mm (0.009-0.015 in)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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