Features: 1. Displacement: 1)EY15-3D:143CBM 2)EY20-3D: 183CBM 3)EY28B & EY28D: 273CBM 2. Type: air-cooled, 4-cycle single cylinder, side valve, gasoline engine 3. Continuous Output: EY15-3D: 1.64kw/3000min (2.2HP/3600RPM)2.01kw/3600min(2.7HP/3600RPM) EY20-3D: 2.24kw/3000min (3HP/3000RPM)2.61kw/3600min(3.5HP/3600RPM) EY28B: 4.10kw/1800min (5.5HP/1800RPM) EY28D: 4.10kw/3600min (5.5HP/ 3600RPM) 4. Maximum Output: EY15-3D: 2.61kw/4000min(3.5HP/3600RPM) EY20-3D: 3.73kw/4000min(5HP/4000RPM) EY28B: 5.59kw/2000min(7.5HP/3600RPM) EY28D: 5.5kw/4000min(7.5HP/4000RPM) 5. Direction of Rotation: Counterclockwise, facing P.T.O. Shaft 6. Lubricant: Class SC or higher grade. SAE#20, #30, #40 7. Fuel: Automobile gasoline (unleaded) 8. Fuel Tank Capacity: 1)EY15-3D: 2.8 Liters 2)EY20-3D:3.8 Liters 3)EY28B & EY28D: 5.5 Liters 9. Spark Plug: EY15-3D & EY20-3D: NGK B-6HS EY28B & EY28D: E6TC 10. Starting System: Recoil starter 11. Dry Weight: 1)EY15-3D: 14kg 2)EY20-3D: 16kg 3)EY28B: 22kg 4)EY28D: 21.5kg