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The ninth and tenth digits form the design block. This block tracks manufacturing modifications, revisions, or vendor changes. An initial production part carries zeros in these slots. A subsequent revision updates the digits sequentially. An 01 suffix indicates a single design modification. Revised parts remain fully backwards compatible. They are interchangeable with previous versions.
This guide explores the anatomy of Yamaha part numbers, the best tools for searching them, and how to navigate the often complex world of parts diagrams.
