ce approved,powered by KOOP advanced air-cooled diesel engine,large silent muffler&air cleaner reducing exhaust and intake noise ... .51×19.09×22.83) Structure model Open-frame Engine model KD186FE Engine type 1-cyliner, 4-stroke, air-cooled, vertical, diesel ... engine Displacement [cm³(Cu-in)] 406 (24.78) Compression ratio 19: ...