Zongshen 161F

Zongshen 161F engineThe Zongshen 161F is a 0.1 L (123 cc, 7.51 cu·in) naturally aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft from the Zongshen BT-series, manufactured by Zongshen Power Co. for general-purpose applications.

The Zongshen BT161F engine has a single-cylinder, overhead valve (OHV) design, and recoil starter. This engine used a carburetor fuel system, transistorized magneto ignition system, splash type lubricating system, and forced-air cooling system. The engine is fitted with a semi-dry foam air cleaner. The ZS 161F is equipped with a 1.5 L (0.4 US. gal. 0.33 Imp. gal.) fuel tank.

The Zongshen ZS 161F engine produced 3.0 PS (2.2 kW; 3.0 HP) at 3,600 rpm of maximum output power

General information

Engine Specifications
Engine model ZS BT161F
Engine type 4-stroke, OHV, single-cylinder
Displacement 123 cm3, (7.51 cu·in)
Max. horsepower 3.0 PS (2.2 kW; 3.0 HP) at 3,600 rpm
Cooling system Forced air
Air cleaner Semy-dry foam filter
Lubricating system Splash
Ignition system Transistorized ignition
Fuel system Carburetor
Fuel consumption 394 g/kWh
Fuel tank capacity 1.5 L (0.4 US. gal. 0.33 Imp. gal.)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil starter
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 390 x 280 x 320 mm (15.4 x 11 x 12.6 in)
Dry weight 12.5 kg (27.6 lbs)

Cylinder Block and Head

It has a 61.0 mm (2.4 in) cylinder bore and 42.0 mm (1.65 in) piston stroke. Compression ratio rating is 8.7:1.

Cylinder block
Compression ratio: 8.7:1
Cylinder bore: 61.0 mm (2.4 in)
Piston stroke: 42.0 mm (1.65 in)
Crankshaft center distance: 21 mm (0.825 in)
Cylinder head
Valve arrangement: OHV, belt driven
Valves: 2

Service Data

The 4-stroke engine oil with a viscosity of 10W-30 is recommended for the ZS 161F, refilling oil capacity is 0.6 L (0.63 US. qt, 0.53 Imp. qt.). The valve clearance is 0.10-0.15 mm (0.0039-0.0059 in) for intake valves and 0.15-0.20 mm (0.0059-0.0079 in) for exhaust valves.

Idle speed: 1,450 rpm
Valve clearance
Intake valve clearance: 0.10-0.15 mm (0.0039-0.0059 in)
Exhaust valve clearance: 0.15-0.20 mm (0.0059-0.0079 in)
Oil system
Lubrication system: Splash type
Oil consupumtion: 6.5 g/kWh
Oil type: 4-stroke engine oil
Recommended oil: 10W-30
Oil capacity: 0.6 L (0.63 US. qt, 0.53 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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