Zongshen NH225

Zongshen NH225The 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

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
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