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 modelZS BT161F
Engine type4-stroke, OHV, single-cylinder
Displacement123 cm3, (7.51 cu·in)
Max. horsepower3.0 PS (2.2 kW; 3.0 HP) at 3,600 rpm
Cooling systemForced air
Air cleanerSemy-dry foam filter
Lubricating systemSplash
Ignition systemTransistorized ignition
Fuel systemCarburetor
Fuel consumption394 g/kWh
Fuel tank capacity1.5 L (0.4 US. gal. 0.33 Imp. gal.)
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemRecoil starter
PTO shaft rotationCounterclockwise (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 weight12.5 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

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
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)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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