The 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 | |
| Model | FE120D / FE120G |
| Type | 4-stroke, OHV, single cylinder |
| Displacement | 124 cm 3 (7.57 cu-in) |
| Max. horsepower | 4.1 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 |
| Carburetor | Float type with fixed main jet |
| Cooling system | Forced-air |
| Ignition system | Flywheel magneto transistor type |
| Lubricating system | Splash |
| Starting system | Recoil or electric starter |
| Stoping system | Ignition primary circuit ground |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 2.5 L (0.66 US Gal, 0.55 Imp Gal.) |
| Fuel consumption | 250 g/HPh |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| Kawasaki FE120 D/G | |
| Length | 291 mm (11.5 in) |
| Width | 349 mm (13.4 in) |
| Height | 344 mm (19.5 in) |
| Dry weight | 14.5 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) |
| Valves: | 2 |
| 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 bolt | 12 Nm; 1.2 kg·m; 9 ft·lb |
| Cylinder head bolt | 25 Nm; 2.5 kg·m; 17 ft·lb |
| Flywheel nut | 64 Nm; 6.5 kg·m; 47 ft·lb |
| Rocker arm lock nut | 7 Nm; 0.7 kg·m; 6 ft·lb |
| Crankcase cover | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Oil drain plug | 32 Nm; 3.3 kg·m; 24 ft·lb |
| Spark plug | 23 Nm; 2.3 kg·m; 17 ft·lb |
Service Information
| Engine | |
| Maximum speed | 4,000 ± 100 rpm |
| Idle speed | 1,600 ± 150 rpm |
| Cylinder compression | 3.0-4.0 kg/cm2 (42-57 psi) at 600 rpm |
| Valve clearance | |
| Intake valve clearance | 0.12 mm (0.0047 in) |
| Exhaust valve clearance | 0.12 mm (0.0047 in) |
| Oil system | |
| Oil type | 4-stroke or an equivalent (SF, SG, SH, or SJ) |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 0.6 L (0.63 US. qt, 0.53 Imp. qt.) |
| Ignition system | |
| Spark plug | NGK: BP5ES |
| Spark plug gap | 0.7-0.8 mm (0.028-0.031 in) |
| Ignition coil air gap | 0.3 mm (0.012 in) |
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