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The O.S. Engine No. 5 One-Way Clutch is a precision component designed for high-performance RC engines. This clutch is engineered to work seamlessly with 12-15CV-X, LD-X, 21RG(P), and FS26S-CX engine models, ensuring reliable starter engagement and smooth power delivery. Built to O.S. Engine's exacting standards, it provides consistent one-way operation for optimal engine performance.