On air cooled engines, having a oil cooler will serve many benefits! This TB oil cooler kit will not only help keep the engine oil cool, which will also cool the engine, but it will also extend the engine life! This oil cooler kit was designed to work with the big bore cylinders with ports on the cylinder such as the Koso,TP Racing, Kitaco and many more.. The oil cooler was designed to mount on the head. Longer oil lines will be needed if you plan to use the ports on the clutch cover instead.