Manuals Brands Harbor Freight Tools Gas Engines Harbor Freight Tools Gas Engines Manuals ProdManuals has more than 9 Harbor Freight Tools Gas Engines manual(s) covering 9 model(s). 1 2 3 5 6 8 Models Document Type 1 13 HP (420cc) OHV Horizontal Shaft Gas Engine EPA 13 HP (420cc) OHV Horizontal Shaft Gas Engine EPA/CARB 2 22 HP (670cc) V_Twin Horizontal Shaft Gas Engine EPA 3 3 HP (79cc) OHV Horizontal Shaft Gas Engine EPA 5 5.5 HP (173cc) OHV Vertical Shaft Gas Engine CARB 6 6.5 HP (212cc) OHV Horizontal Shaft Gas Engine EPA 6.5 HP (212cc) OHV Horizontal Shaft Gas Engine EPA/CARB 8 8 HP (301cc) OHV Horizontal Shaft Gas Engine EPA 8 HP (301cc) OHV Horizontal Shaft Gas Engine EPA/CARB