Kawasaki FC420V

Kawasaki FC420VThe 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
Type4-stroke, OHV, single cylinder
Displacement423 cm 3 (25.81 cu-in)
Max. horsepower14.1 PS (10.4 KW; 14.0 HP) at 3,600 rpm
Max. torque30.6 Nm (3.12 kg·m; 22.58 ft·lb) at 2,400 rpm
CarburetorFloat type with fixed main jet
Cooling systemForced-air
Ignition systemFlywheel magneto transistor type
Lubricating systemFull pressurized
Starting systemRecoil or electric starter
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity
Fuel consumption255 g/HPh
PTO shaft rotationCounterclockwise (from PTO shaft side)

Dimensions and Weight

Kawasaki FC420V
Length448 mm (17.6 in)
Width423 mm (16.7 in)
Height436 mm (17.2 in)
Dry weight35.2 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
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

Maximum speed3,500 ± 100 rpm
Idle speed1,500 ± 150 rpm
Cylinder compression5.0 kg/cm2 (70 psi)
Valve clearance
Intake valve0.15 mm (0.006 in)
Exhaust valve0.15 mm (0.006 in)
Oil system
Oil type4-stroke or an equivalent (SF, SE, SD)
Recommended oilSAE 10W-30, 10W-40
Oil capacity1.3 L (1.4 US. qt)
Ignition system
Spark plugNGK: BPR5ES;
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
Ignition coil air gap0.3 mm (0.012 in)

Tightening torque specs

Tightening torque specs
Cylinder head52 Nm; 5.2 kg·m; 38.3 ft·lb
Connecting rod20 Nm; 2.0 kg·m; 14.7 ft·lb
Flywheel137 Nm; 14 kg·m; 101 ft·lb
Crankcase cover26 Nm; 2.6 kg·m; 19.2 ft·lb
Oil drain plug23 Nm; 2.3 kg·m; 16.7 ft·lb
Valve clearance lock nut20 Nm; 2.0 kg·m; 14.7 ft·lb
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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  1. 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.

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