New Old Stock ISO cycle Oil cooler for Yamaha DT2 MX & RT2 MX Engines. ISO cooler was Developed by a NASA engineer to using technology developed for the space program. A simple quick replacement for the engine dip stick on most models. The cooler has a billet aluminum top and the hollow tube is filled with a liquid that transfers the heat to the alloy "radiator" top where the heat is dispursed by airfow. Sturdy construction for years of "cool" service.

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