Honda CB550 Four 550 CC Engine Oil Pump 1974-1978 OEM 15100-323-003

Product Description

This is an authentic factory OEM Honda engine oil pump assembly designed for classic SOHC inline-four motorcycle engines. It serves as the main lubrication pump, drawing oil from the lower crankcase pan and circulating it under pressure to vital internal components including the crankshaft journals, transmission shafts, and upper valvetrain. The assembly features a cast aluminum housing with internal precision steel pumping gears, an integrated upper drive spur gear, and relief valve passages with compression spring channels to help regulate oil pressure during engine operation. Fitment and Compatible Models This oil pump setup fits Honda’s mid-sized 1970s SOHC four-cylinder engine family. Honda CB550K Four K0–K4 — 1974, 1975, 1976, 1977, 1978 Honda CB550F Super Sport — 1975, 1976, 1977 Honda CB500K Four — 1971, 1972, 1973 Note: Not suitable for later DOHC engines or mid-1980s Nighthawk 550 models.