The Zongshen NH225 is a 224 cc, (13.7 cu·in) single-cylinder air-cooled 4-stroke internal combustion small gasoline engine, from NH-series manufactured by Zongshen Power Co.
Cylinder bore and piston stroke are 77.0 mm (3.03 in) and 55.0 mm (2.17 in), respectively.
The Zongshen NH225 produced 6.1 PS (4.5 kW; 6.0 HP) at 3,800 rpm of maximum output power and 12.5 Nm (1.28 kg·m; 9.23 ft·lb) at 3,600 rpm of maximum torque.
General information
| Engine Specifications | |
| Model | NH225 |
| Type | 4-stroke, OHV, single cylinder |
| Displacement | 224 cm2, (13.7 cu·in) |
| Max. horsepower | 6.1 PS (4.5 kW; 6.0 HP) at 3,600 rpm |
| Max. torque | 12.5 Nm (1.28 kg·m; 9.23 ft·lb) |
| Fuel system | Carburetor |
| Cooling system | Forced-air |
| Ignition system | – |
| Lubricating system | Splash system |
| Starting system | Recoil starter |
| Fuel tank capacity | 2.8 L (0.74 US. gal. 0.62 Imp. gal.) |
| Fuel consumption | 374 g/kWh |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| Zongshen NH225 | |
| Length, mm (in) | 390 (15.4) |
| Width, mm (in) | 273 (10.7) |
| Height, mm (in) | 420 (16.5) |
| Dry weight, kg (lb) | 15.4 kg (34 lbs) |
Maintenance data
| Engine | |
| Maximum speed: | 4,000 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 | 0.6 L (0.63 US. qt, 0.53 Imp. qt.) |
| Ignition system | |
| 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 |
choke on and off positioning