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The O.S. Engine One-Way Clutch (73008200) is a precision component designed specifically for the 18TZ-TX engine. This clutch enables smooth power transmission in one direction while allowing free-wheeling in the opposite direction, essential for reliable engine performance in RC applications. Built to O.S. Engine's exacting standards, it ensures consistent engagement and durability through repeated cycles. Ideal for hobbyists maintaining or upgrading their 18TZ-TX powered models.