The Zongshen 161F is a 123 cc, (7.51 cu·in) single-cylinder air-cooled 4-stroke internal combustion small gasoline engine manufactured by Zongshen Power Co. for general-purpose applications.
The Zongshen BT161F engine has an overhead valve (OHV) design, carburetor fuel system, transistorized ignition system, and a recoil starter. The ZS 161F engine a compression ratio rating is 8.7:1, cylinder bore and piston stroke are 61.0 mm (2.4 in) and 42.0 mm (1.65 in), respectively.
The Zongshen ZS 161F produced 3.0 PS (2.2 kW, 3.0 HP) at 3,600 rpm of maximum horsepower.
General information
| Engine Specifications | |
| Model | BT 161F |
| Type | 4-stroke, OHV, single cylinder |
| Displacement | 123 cm2, (7.51 cu·in) |
| Max. horsepower | 3.0 PS (2.2 kW, 3.0 HP) at 3,600 rpm |
| Max. torque | – |
| Fuel system | Carburetor |
| Cooling system | Forced-air |
| Ignition system | Transistorized |
| Lubricating system | Splash system |
| Starting system | Recoil starter |
| Fuel tank capacity | 1.5 L (0.4 US. gal. 0.33 Imp. gal.) |
| Fuel consumption | 394 g/kWh |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| Zongshen ZS 161F | |
| Length, mm (in) | 390 (15.4) |
| Width, mm (in) | 280 (11.0) |
| Height, mm (in) | 320 (12.6) |
| Dry weight, kg (lb) | 12.5 (27.6) |
Maintenance data
| Engine | |
| Idle speed: | 1,450±150 rpm |
| Valve clearance | |
| Intake valve | 0.10-0.15 mm (0.0039-0.0059 in) |
| Exhaust valve | 0.15-0.20 mm (0.0059-0.0079 in) |
| Oil system | |
| Oil type | 4-stroke engines oil |
| Recommended oil | 10W-30 |
| Oil capacity | 0.6 l (0.6 US gal. 0.5 Imp. gal.) |
| 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 |
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