Zongshen 173F(E)

Zongshen 173F(E) engineThe Zongshen ZS 173F(E) is a 0.2 L (243 cc, 14.83 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Zongshen Power Co. for general-purpose applications.

The ZS 173F(E) engine has a single-cylinder, overhead valve (OHV) design, and recoil starter (173F) or electric starter (173FE). This engine used a carburetor fuel system, transistorized magneto ignition system, splash type lubricating system, and forced-air cooling system. The ZS 1730F(E) is equipped with a 5.2 L (1.37 US. gal. 1.14 Imp. gal.) fuel tank.

The Zongshen 173F(E) engine produced 6.7 PS (4.9 kW; 6.5 HP) at 3,600 rpm of horsepower and 14.0 N·m (1.4 kg·m, 10.3 ft·lb) of torque.

General information

Engine Specifications
Engine model ZS 173F(E)
Engine type 4-stroke, OHV, single-cylinder
Displacement 243 cm3, (14.83 cu·in)
Max. horsepower 6.7 PS (4.9 kW; 6.5 HP) at 3,600 rpm
Max. torque 14.0 N·m (1.4 kg·m, 10.3 ft·lb)
Cooling system Forced air
Lubricating system Splash
Ignition system Transistorized ignition
Fuel system Carburetor
Fuel consumption 374 g/kWh
Fuel tank capacity 5.2 L (1.37 US. gal. 1.14 Imp. gal.)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil or electric starter
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 435 x 370 x 425 mm (17.1 x 14.6 x 16.7 in)
Dry weight 25.0 kg (55.1 lbs)

Cylinder Block and Head

It has a 73.0 mm (2.87 in) cylinder bore and 58.0 mm (2.28 in) piston stroke. Compression ratio rating is 8.4:1.

Cylinder block
Compression ratio: 8.4:1
Cylinder bore: 73.0 mm (2.87 in)
Piston stroke: 58.0 mm (2.28 in)
Crankshaft center distance: 29 mm (1.14 in)
Cylinder head
Valve arrangement: OHV, belt driven
Valves: 2

Service Data

The 4-stroke engine oil with a viscosity of SAE 10W-30 is recommended for the ZS 173F(E), refilling oil capacity is 1.1 L (1.16 US. qt, 0.97 Imp. qt.). The valve clearance is 0.10-0.15 mm (0.004-0.006 in) for intake valves and 0.15-0.20 mm (0.006-0.008 in) for exhaust valves.

Maximum speed: 3,900 rpm rpm
Idle speed: 1,800±200 rpm rpm
Valve clearance
Intake valve clearance (COLD): 0.10-0.15 mm (0.004-0.006 in)
Exhaust valve clearance (COLD): 0.15-0.20 mm (0.006-0.008 in)
Oil system
Lubrication system: Splash
Oil type: 4-stroke engine oil
Recommended oil: SAE 10W-30
Oil capacity: 1.1 L (1.16 US. qt, 0.97 Imp. qt.)
Fuel system
Type: Carburetor
Ignition system
Type: Transistorized ignition
Ignition timing: 23°±2° B.T.D.C.
Spark plug gap: 0.6-0.8 mm (0.0236-0.0315 in)
Spark plug torque: 20 N·m (2 kg·m, 14.7 ft·lb)

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