The Kawasaki FE120D / FE120G is a 124 cc (7.57 cu-in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Kawasaki Heavy Industries LTd for general-purpose applications.
A 60.0 mm (2.36 in) cylinder bore and 44.0 mm (1.73 in) piston stroke give the FE120 engine a total of 129 cc of displacement. The compression ratio rating is 8.5:1.
The FE120 engine produced 4.1 PS (3 kW; 4.0 HP) at 3,600 rpm of maximum horsepower and 7.6 Nm (0.78 kg·m; 5.61 ft·lb) at 2,800 rpm of peak torque.
The Kawasaki FE120 features:
- Cast iron cylinder liner
- OHV (overhead valve) design
- Float, butterfly type carburetor with fixed main jet
- Flywheel magneto transistor type ignition system
- Mechanical fly-weight type governor
- Splash type lubrication system
- Forced air cooling system
- Recoil starter with ACR or electric starter
- The FE120G model with 1/2 cam gear reduction
General information
| Engine Specifications | |
| Engine model | FE120D / FE120G |
| Engine type | 4-stroke, single-cylinder, OHV |
| Displacement | 124 cm3, (7.57 cu·in) |
| Max. horsepower | 4.0 PS (3 kW; 4.0 HP) at 3,600 rpm |
| Max. torque | 7.6 Nm (0.78 kg·m; 5.61 ft·lb) at 2,800 rpm |
| Cooling system | Forced air |
| Air cleaner | Dual-type or oil bath type (optional) |
| Lubricating system | Splash type |
| Ignition system | Flywheel magneto transistor type |
| Carburetor | Float, butterfly type with fixed main jet |
| Fuel tank capacity | 2.5 liters (2.64 US.qts, 2.2 Imp. qts) |
| Fuel consumption | 250 g/HPh |
| Fuel used | Regular gasoline |
| Starting system | Recoil starter with ACR or electric starter |
| Governor | Mechanical fly-weight type governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 291 x 349 x 344 mm (11.46 x 13.43 x 19.54 in) |
| Dry weight | 14.5 kg (32.0 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 8.5:1 |
| Cylinder bore: | 60.0 mm (2.36 in) |
| Piston stroke: | 44.0 mm (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) |
| Valve guide bore (INTAKE): | 5.562 mm (0.2190 in) |
| Valve guide bore (EXHAUST): | 5.562 mm (0.2190 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 Data
| Engine | |
| Maximum speed: | 4,000 rpm |
| Idle speed: | 1,600 rpm |
| Cylinder compression pressure | |
| With recoil starter (min): | 290 kPa (3.0 kg/cm2, 42 psi) |
| With electric starter (min): | 390 kPa (4.0 kg/cm2, 57 psi) |
| Valve clearance | |
| Intake valve clearance: | 0.12 mm (0.0047 in) |
| Exhaust valve clearance: | 0.12 mm (0.0047 in) |
| Oil system | |
| Lubrication system: | Splash type |
| Oil type: | API SF, SG, SH, or SJ |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | 0.6 liters (0.63 US.qts, 0.53 Imp. qts) |
| Ignition system | |
| Type: | Flywheel magneto transistor type |
| Spark plug: | NGK BP5ES |
| Spark plug gap: | 0.7-0.8 mm (0.028-0.031 in) |
| Contact breaker gap | 0.25-0.40 mm (0.010-0.016 in) |
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