Zongshen 173F(E)

The Zongshen 173F(E) is a 243 cc, (14.83 cu·in) single-cylinder air-cooled 4-stroke internal combustion small gasoline engine manufactured by Zongshen Power Co. for general-purpose applications.

The Zongshen 173F(E) engine has an overhead valve (OHV) design, carburetor fuel system, transistorized ignition system, and a recoil starter or electric starter. The Zongshen ZS 173F(E) engine a compression ratio rating is 8.4:1. Bore and stroke are 73.0 mm (2.87 in) and 54.0 mm (2.13 in), respectively.

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

General information

Engine Specifications
Model	BT 173F(E)
Type	4-stroke, OHV, single cylinder
Displacement	243 cm2, (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)
Fuel system	Carburetor
Cooling system	Forced-air
Ignition system	Transistorized
Lubricating system	Splash system
Starting system	173F – Recoil starter 173FE – Electric staretr
Fuel tank capacity	5.2 L (1.37 US. gal. 1.14 Imp. gal.)
Fuel consumption	374 g/kWh
PTO shaft rotation	Counterclockwise (from PTO shaft side)

Dimensions and Weight

	Zongshen ZS 173F(E)
Length, mm (in)	435 (17.1)
Width, mm (in)	370 (14.6)
Height, mm (in)	425 (16.7)
Dry weight, kg (lb)	25.0 (55.1)

Maintenance data

Engine
Maximum speed:	3,900 rpm
Idle speed:	1,800±200 rpm
Valve clearance
Intake valve	0.10-0.15 mm (0.004-0.006 in)
Exhaust valve	0.15-0.20 mm (0.006-0.008 in)
Oil system
Oil type	4-stroke engines oil
Recommended oil	10W-30
Oil capacity	1.1 L (1.16 US. qt, 0.97 Imp. qt.)
Ignition system
Ignition timing	23°±2° B.T.D.C. (Fixed)
Spark plug gap	0.6-0.8 mm (0.024-0.031 in)
Spark plug torque	20 N·m; 2.0 kg·m; 14.7 ft·lb