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Stock (left) versus T.P. (right). When Harley began to use hydraulic tappets, they realized there wasn't enough flow to keep them lubricated. They addressed this problem by using an oil pump with two valves on the pressure side. These flow oil to the tappets instead of the crank area when the bike is started and running at idle. The crank area receives whatever oil manages to splash into it from the top end. Once the engine was running over 2,000 rpm, the pump stopped sending oil to the tappets and began sending it to the crank area. Both tappets and crank would receive lubrication while riding. T.P. Engineering's pump... View Related Article
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