Natural Gas Generator Engine Model WM5.0GF(E)-Q Engine Model WM188F Engine Type OHV, Single cylinder, Forced Air Cooling,4-Stroke Bore×Stroke(mm) 88×64 Ignition system Transistor magneto Starting system Recoil start/Electric start Compression Ratio 8.0:1 Oil capacity(L) 1.1 Generator Rated amperage(A) 22.7 Max.power(kw) When Natural gas pressure at 2000Pa 5.5 Rated.power(kw) When Natural gas pressure at 2000Pa 5.0 Phase 1 Voltage regulation Automatic Voltage Regulation