The Kawasaki FX801V is a 0.85 l (852 cc, 51.99 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, commercial mowers, heavy-duty industrial and construction equipment.
The Kawasaki FX801V has V-twin design with vertical PTO shaft. The motor uses overhead V-valves; spherical combustion chamber; cast-iron cylinder liners; metal engine cover with integrated cleanout ports; rotating metal grass chopper screen. The engine is equipped with electronic spark ignition and twin-barrel, internally vented carburetor with fuel shut-off solenoid. The motor uses a high-performance lubrication system with high-efficiency oil cooler and double or multi-stage canister air filter.
The engine has an automatic compression release (ACR) system with recoil or heavy-duty shift-type starter. 13A or 20A charge coils, various oil drains, oil pressure switches, and shaft variations are available as an option.
A 84.5 mm (3.33 in) cylinder bore and 76.0 mm (2.99 in) piston stroke give the motor a total of 852 cc (51.99 cu-in) of displacement. Compression ratio rating is 8.2:1. The FX801V engine produced 27.1 PS (19.9 kW; 26.6 HP) at 3,600 rpm or 25.8 PS (19.0 kW; 25.5 HP) at 3,600 rpm of maximum horsepower and 63.0 Nm (6.4 kg·m; 46.5 ft·lb) at 2,400 rpm or 60.5 Nm (6.2 kg·m; 44.6 ft·lb) at 2,400 rpm of torque.
General information
| Engine Specifications | |
| Model | FX801V |
| Type | 4-stroke, OHV, V-twin 90° |
| Displacement | 852 cm 3 (51.99 cu-in) |
| Max. horsepower |
27.1 PS (19.9 KW; 26.6 HP) at 3,600 rpm 25.8 PS (19.0 KW; 25.5 HP) at 3,600 rpm |
| Max. torque (crank PTO) |
63.0 Nm (6.4 kg·m; 46.5 ft·lb) at 2,400 rpm 60.5 Nm (6.2 kg·m; 44.6 ft·lb) at 2,400 rpm |
| Carburetor | Twin barrel, internally vented carburetor |
| Cooling system | Air-cooling |
| Ignition system | Electronic spark ignition |
| Lubricating system | High performance lubrication system |
| Starting system | Heavy duty shift type starter |
| Charging system | 13A or 20A charge coil (option) |
| Fuel used | Unleaded gasoline (octane number 91 or higher) |
| Fuel consumption | – |
| Cooling system | Pressurized forced circulation type |
Dimensions and Weight
| Kawasaki FX801V | |
| Length, mm (in) | 488 (19.2) |
| Width, mm (in) | 472 (18.6) |
| Height, mm (in) | 626 (24.6) |
| Dry weight, kg (lb) | 56.4 (124.3) |
Tightening torque specs
| Tightening torque specs | Cylinder head | 46 Nm; 4.6 kg·m; 33.9 ft·lb |
| Connecting rod | 20.6 Nm; 2.1 kg·m; 15.2 ft·lb |
| Flywheel | 56 Nm; 5.7 kg·m; 41.3 ft·lb |
| Crankcase cover | 46 Nm; 4.6 kg·m; 33.9 ft·lb |
| Intake manifold | 6 Nm; 0.6 kg·m; 4.4 ft·lb |
| Oil drain plug | 7 Nm; 0.7 kg·m; 5.2 ft·lb |
| Valve clearance lock nut | 11 Nm; 1.1 kg·m; 8.1 ft·lb |
Maintenance data
| Engine | |
| Maximum speed | 3500 ± 100 rpm |
| Idle speed | 1500 ± 100 rpm |
| Cylinder compression | 4.5 kg/cm2 (64 psi) at 500 rpm |
| Valve clearance | |
| Intake valve | 0.10-0.15 mm (0.004-0.006 in) |
| Exhaust valve | 0.10-0.15 mm (0.004-0.006 in) |
| Oil system | |
| Oil type | 4-stroke or an equivalent (SJ or higher class) |
| Recommended oil | SAE 10W-40, 10W-30 |
| Oil capacity (with filter changed) |
With oil filter: 2.3 litre Without oil filter: 2.1 litre |
| Ignition system | |
| Spark plug | NGK: BPR4ES |
| Spark plug gap | 0.7-0.8 mm (0.027-0.031 in) |
| Ignition coil air gap | 0.2-0.4 mm (0.008-0.011 in) |
| Spark plug tightening torque | 22 Nm; 2.2 kg·m; 16.2 ft·lb |
hello,having issues with deciding whether or not i should replace my fx801v ( on exmark s mower) that has thrown a connecting rod thru block, with another new same motor.
I have the same question. Just had my FX801V with only 379 hours throw a rod through the block. I specifically bought this Lazer Z for the Kawasaki engine (had Kohler on previous one). Thinking I made a poor choice.
fx801v versus kohler, which one is better in a 60″ Lexmark laser s
Question about Kawasaki fx801v 600 hours Don’t know if it’s normal or not but always takes a lot of cranks to get started. Been doing that since under 200 hours.