The 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
| Engine | |
| 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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