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) |
My 2016 Ventrac 4500P Tractor is powered by a Kawasaki FD851D V-Twin. I’m troubleshooting a recent degradation in performance. I found it odd that the OEM Service Manual did not include performance specifications. Specifically I find the OEM compression specification. However, your website provided this information. Thank You !
Shaft dia. And length would be very helpful.
As well as mounting pattern.
I couldn’t find this info on the website or documentation.
Having problems with sounding like flooding. Gauge for fuel pressure shows 22psi. This is with bypass hooked up. Without getting 32psi.
What should it be?