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
Type4-stroke, OHV, single cylinder
Displacement224 cm2, (13.7 cu·in)
Max. horsepower6.1 PS (4.5 kW; 6.0 HP) at 3,600 rpm
Max. torque12.5 Nm (1.28 kg·m; 9.23 ft·lb)
Fuel systemCarburetor
Cooling systemForced-air
Ignition system
Lubricating systemSplash system
Starting systemRecoil starter
Fuel tank capacity2.8 L (0.74 US. gal. 0.62 Imp. gal.)
Fuel consumption374 g/kWh
PTO shaft rotationCounterclockwise (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 valve0.10-0.15 mm (0.004-0.006 in)
Exhaust valve0.15-0.20 mm (0.006-0.008 in)
Oil system
Oil type4-stroke engines oil
Recommended oil10W-30
Oil capacity0.6 L (0.63 US. qt, 0.53 Imp. qt.)
Ignition system
Spark plug gap0.6-0.8 mm (0.024-0.031 in)
Spark plug torque20 N·m; 2.0 kg·m; 14.7 ft·lb
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