Naraku oil pump for scooters with 50cc Minarelli engines. A faulty oil pump is often the cause of seized cylinder and defective crankshaft and bearings. Please note that when changing the oil pump that a tank with 1:50 pre-mix should be run. This helps to bridge the bleed time of the pump and the oil lines immediately after installation without damage to the engine. The pipes and pump are already filled with 2-stroke oil.