Honda GX120UT1QX2 118cc GX120 Series OHV 3.5 HP Engine With Straight Keyed Shaft 3/4-Inch by 2-7/16-Inch Crankshaft Automatic mechanical decompression system and precise intake and exhaust control Efficient 4 stroke OHV technology Cast iron cylinder, ball bearing supported crankshaft Oil alert technology Straight keyed shaft