| 
 Model  | 
 R180NL  | 
 R185NL  | 
| 
 Type  | 
 Single-cylinder Horizontal Four-stroke  | 
| 
 Combustion system  | 
 Swirlcombustion Chamber  | 
| 
 Bore×stroke(mm)  | 
 80×80  | 
 80×85  | 
| 
 Compression ratio  | 
 21±1  | 
 21±1  | 
| 
 1-hour rated output(kw/r/min)  | 
 5.67/2600  | 
 6.47/2600  | 
| 
 12-hour rated output(kw/r/min)  | 
 5.15/2600  | 
 5.88/2600  | 
| 
 Specific fuel consumption(g/kw.h)  | 
 ≤287  | 
 ≤287  | 
| 
 Specific lube oil consumption(g/kw.h)  | 
 ≤4.08  | 
 ≤4.08  | 
| 
 Cooling system  | 
 Radiator  | 
| 
 Lubrication system  | 
 Combined pressure and Splashing  | 
| 
 Starting method  | 
 Hand crank  | 
| 
 Net weight(kg)  | 
 72  | 
 72  | 
| 
 Method of power output  | 
 Output of flywheel end  | 
| 
 Overall dimensions (mm)  | 
 625×341×464  | 
 625×341×464  |