To add effectiveness to your existing engine cooling mods, you can swap out the standard oil pump for this uma racing unit. The bigger fins on this performance oil pump will spin the engine oil around quicker. Works well together with an external oil cooler. A must for big bore cylinder mods and long distance travellers. This high flow oil pump will fit various models of the Honda Cub, including the C90/C100 Dream/Astrea and Wave 100 underbone models, and many chinese clones.