Only 1 left in stock
Hepolite has recently added this upgraded cast iron oil pump to their product line of high-quality reproduction parts for the unit-construction BSA 500 and 650 twin cylinder models. The early BSA twin oil pumps made from Mazak alloy were prone to distortion at the joint face at the mounting point on the crankcase, which contributed to wet-sumping. During the 1971 model year production, BSA introduced the superior cast iron oil pump in the A65 and A70 models. This pump is made to the later condition with end plate retaining bolts.
Made in the UK, this oil pump is CNC manufactured using a high grade cast iron body to improve wear properties, with less risk of body distortion than standard or aftermarket anodised alloy pumps. Internal gear to body tolerances are much closer than OEM pumps were, reducing occurrences of wet-sumping when stood up for long periods. The tachometer drive extension is integrated into the oil pump driving gear.
The oil pump is the heart of the lubrication system in a motorcycle engine, providing flow of pressurized oil to the big-end crankshaft journals, valve train, and other moving parts, then returning the oil back into the reservoir through its scavenging function. A weak or worn out oil pump can lead to eventual engine damage.
The inner and outer timing covers must be removed to access the oil pump. Some fettling may be required to the front mounting lug of the pump to gain clearance with the inner timing cover on some earlier engines originally equipped with OEM oil pumps. Refer to installation instructions in the factory workshop manual.