Kawasaki FE120

Kawasaki FE120The Kawasaki FE120 is a 124 cc (7.57 cu-in) single-cylinder air-cooled 4-stroke internal combustion small gasoline engine with horizontal shaft manufactured by Kawasaki Heavy Industries LTd., for general-purpose applications.

The FE120 engine has an OHV (overhead valve) design; cast iron cylinder liner; float type carburetor with fixed main jet; flywheel magneto transistor type ignition system; mechanical governor and recoil starter with automatic compression release (electric starter was available as an option). The engine uses dual-element air cleaner or oil bath type air cleaner as an option.

Сylinder bore is 60.0 mm (2.4 in) and the piston stroke is 44.0 mm (1.73 in), compression ratio rating is 8.5:1. The Kawasaki FE120 motor produced 4.1 PS (3 kW; 4.0 HP) at 3,600 rpm of horsepower and 7.6 Nm (0.78 kg·m; 5.61 ft·lb) at 2,800 rpm of torque. The FE120G – 1/2 cam gear reduction.

General information

Engine Specifications
ModelFE120D / FE120G
Type4-stroke, OHV, single cylinder
Displacement124 cm 3 (7.57 cu-in)
Max. horsepower4.1 PS (3 KW; 4.0 HP) at 3,600 rpm
Max. torque (crank PTO)7.6 Nm (0.78 kg·m; 5.61 ft·lb) ta 2,800 rpm
CarburetorFloat type with fixed main jet
Cooling systemForced-air
Ignition systemFlywheel magneto transistor type
Lubricating systemSplash
Starting systemRecoil or electric starter
Stoping systemIgnition primary circuit ground
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity2.5 L (0.66 US Gal, 0.55 Imp Gal.)
Fuel consumption250 g/HPh
PTO shaft rotationCounterclockwise (from PTO shaft side)

Dimensions and Weight

Kawasaki FE120 D/G
Length291 mm (11.5 in)
Width349 mm (13.4 in)
Height344 mm (19.5 in)
Dry weight14.5 kg (32.0 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:8.5:1
Bore x stroke:60.0 x 44.0 mm (2.36 x 1.73 in)
Cylinder internal diameter (max):60.067 mm (2.3648 in)
Number of piston rings (compression / oil):2/1
Connecting rod big end diameter (max):26.052 mm (1.0257 in)
Connecting rod small end diameter (max):14.042 mm (0.5528 in)
Piston pin diameter (min):13.975 mm (0.5502 in)
Side clearance (Top):0.150 mm (0.0059 in)
Side clearance (Second):0.120 mm (0.0047 in)
Piston ring end gap (Top):1.000 mm (0.0390 in)
Piston ring end gap (Second):1.000 mm (0.0390 in)
Piston ring end gap (Oil):Visual Inspection
Piston ring thickness (Top):1.420 mm (0.0560 in)
Piston ring thickness (Second):1.420 mm (0.0560 in)
Crankshaft journal diameter (min):19.930 mm (0.7846 in)
Crankshaft crankpin diameter (min):25.944 mm (1.0214 in)
Cylinder head
Valve arrangement:OHV (overhead valves)
Valve steam diameter (INTAKE):5.430 mm (0.2138 in)
Valve steam diameter (EXHAUST):5.415 mm (0.2132 in)
Valve spring free length (INTAKE):31.8 mm (1.2520 in)
Valve spring free length (EXHAUST):31.8 mm (1.2520 in)
Camshaft journal diameter: PTO side: 22.927 mm (0.9026 in)
Flywheel side (FE120D): 22.927 mm (0.9026 in)
Flywheel side (FE120G): 29.930 mm (1.1783 in)

Tightening torque specs

Tightening torque specs
Connecting rod bolt12 Nm; 1.2 kg·m; 9 ft·lb
Cylinder head bolt25 Nm; 2.5 kg·m; 17 ft·lb
Flywheel nut64 Nm; 6.5 kg·m; 47 ft·lb
Rocker arm lock nut7 Nm; 0.7 kg·m; 6 ft·lb
Crankcase cover10 Nm; 1.0 kg·m; 7 ft·lb
Oil drain plug32 Nm; 3.3 kg·m; 24 ft·lb
Spark plug23 Nm; 2.3 kg·m; 17 ft·lb

Service Information

Maximum speed4,000 ± 100 rpm
Idle speed1,600 ± 150 rpm
Cylinder compression3.0-4.0 kg/cm2 (42-57 psi) at 600 rpm
Valve clearance
Intake valve clearance0.12 mm (0.0047 in)
Exhaust valve clearance0.12 mm (0.0047 in)
Oil system
Oil type4-stroke or an equivalent (SF, SG, SH, or SJ)
Recommended oilSAE 10W-30
Oil capacity0.6 L (0.63 US. qt, 0.53 Imp. qt.)
Ignition system
Spark plugNGK: BP5ES
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
Ignition coil air gap0.3 mm (0.012 in)
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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