The Kawasaki FC420V is a 423 cc (25.81 cu-in) single-cylinder air-cooled 4-stroke internal combustion small gasoline engine with vertical shaft manufactured by Kawasaki Heavy Industries LTd., for general-purpose applications.
The FC420V engine has an OHV (overhead valve) design; cast-iron cylinder liner; reciprocating balancer; float type carburetor with fixed main jet; flywheel magneto transistor type ignition system; mechanical governor; low tone muffler; recoil starter with an automatic compression release.
The engine uses semi cyclone type air cleaner with dual element; pressurized lubrication system and pulse type fuel pump. The Kawasaki FC420V could be equipped with electric starter and 12V (3A, 5A, 9A or 13A) charging coil.
A 89.0 mm (3.5 in) cylinder bore and 68.0 mm (2.68 in) piston stroke give the motor a total of 423 cc of displacement. Compression ratio rating is 8.4:1. The Kawasaki FC420V motor produced 14.1 PS (10.4 KW; 14.0 HP) at 3,600 rpm of horsepower and 30.6 Nm (3.12 kg·m; 22.58 ft·lb) at 2,400 rpm of torque.
General information
Engine Specifications | |
Model | FC420V |
Type | 4-stroke, OHV, single cylinder |
Displacement | 423 cm 3 (25.81 cu-in) |
Max. horsepower | 14.1 PS (10.4 KW; 14.0 HP) at 3,600 rpm |
Max. torque | 30.6 Nm (3.12 kg·m; 22.58 ft·lb) at 2,400 rpm |
Carburetor | Float type with fixed main jet |
Cooling system | Forced-air |
Ignition system | Flywheel magneto transistor type |
Lubricating system | Full pressurized |
Starting system | Recoil or electric starter |
Fuel used | Unleaded gasoline (octane number 86 or higher) |
Fuel tank capacity | – |
Fuel consumption | 255 g/HPh |
PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
Kawasaki FC420V | |
Length | 448 mm (17.6 in) |
Width | 423 mm (16.7 in) |
Height | 436 mm (17.2 in) |
Dry weight | 35.2 kg (77.6 lbs) |
Cylinder Block and Head
Cylinder block | |
Compression ratio: | 8.4:1 |
Cylinder bore: | 89.0 mm (3.5 in) |
Piston stroke: | 68.0 mm (2.68 in) |
Cylinder internal diameter (standard): | 89.076 mm (3.5069 in) |
Number of piston rings (compression / oil): | 2/1 |
Connecting rod big end diameter (standard): | 41.068 mm (1.6168 in) |
Connecting rod small end diameter (standard): | 22.059 mm (0.8685 in) |
Piston pin diameter: | 21.977 mm (0.8652 in) |
Side clearance (Top): | 0.170 mm (0.0067 in) |
Side clearance (Second): | 0.150 mm (0.0059 in) |
Side clearance (Oil): | 0.200 mm (0.0079 in) |
Ring end gap (Top): | 0.900 mm (0.0354 in) |
Ring end gap (Second): | 0.900 mm (0.0354 in) |
Ring width (Top): | 1.940 mm (0.0764 in) |
Ring width (Second): | 1.940 mm (0.0764 in) |
Crankshaft main journal diameter: |
PTO side: 34.919 mm (1.3748 in) Magneto side: 34.945 mm (1.3758 in) |
Crankpin journal diameter: | 40.928 mm (1.6113 in) |
Crankshaft center distance: | 34 mm (1.34 in) |
Cylinder head | |
Valve arrangement: | OHV |
Valves: | 2 |
Valve steam diameter (INTAKE): | 6.930 mm (0.2728 in) |
Valve steam diameter (EXHAUST): | 6.915 mm (0.2722 in) |
Valve spring free length (INTAKE): | 37.5 mm (1.4764 in) |
Valve spring free length (EXHAUST): | 37.5 mm (1.4764 in) |
Camshaft lobe height (INTAKE): | 36.750 mm (1.4468 in) |
Camshaft lobe height (EXHAUST): | 36.750 mm (1.4468 in) |
Camshaft journal diameter: |
Gear side: 20.912 mm (0.8233 in) Cam side: 19.912 mm (0.7839 in) |
Service Information
Engine | |
Maximum speed | 3,500 ± 100 rpm |
Idle speed | 1,500 ± 150 rpm |
Cylinder compression | 5.0 kg/cm2 (70 psi) |
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 (SF, SE, SD) |
Recommended oil | SAE 10W-30, 10W-40 |
Oil capacity | 1.3 L (1.4 US. qt) |
Ignition system | |
Spark plug | NGK: BPR5ES; |
Spark plug gap | 0.7-0.8 mm (0.028-0.031 in) |
Ignition coil air gap | 0.3 mm (0.012 in) |
Tightening torque specs
Tightening torque specs | Cylinder head | 52 Nm; 5.2 kg·m; 38.3 ft·lb |
Connecting rod | 20 Nm; 2.0 kg·m; 14.7 ft·lb |
Flywheel | 137 Nm; 14 kg·m; 101 ft·lb |
Crankcase cover | 26 Nm; 2.6 kg·m; 19.2 ft·lb |
Oil drain plug | 23 Nm; 2.3 kg·m; 16.7 ft·lb |
Valve clearance lock nut | 20 Nm; 2.0 kg·m; 14.7 ft·lb |
We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.
I have one of these 14 hp electric start Kawasaki engines that I bought 20 years ago that came with a DR field and brush mower. The DR mower wore out, but not this Kawasaki. I saved this excellent engine and mounted it on an old Bunton mower. Still running fantastic, no maintenance needed beyond oil and filter changes. I’m a Kawasaki fan.
Any chance you have the manual for it you could email me?
Great info, all I needed to reassemble the fc420 engine.
Ottimo motore, praticamente un mulo.
I need the manual for it ?
Manual is available as a PDF. Search Kawasaki FC420V manual or shop manual. It is available from several places