Replace Pre-Unit Royal Enfield Primary Chain

Reader Contribution by The Motorcycle Classics Staff
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Always turning and pulling a load, the primary chain is yet another oft-ignored motorcycle maintenance item. Fortunately, they’re usually quite robust, and outside of regular tension adjustment they typically require little attention.

Hidden from view as they are, it’s not surprising that many owners ignore them, yet they do need occasional replacement. True to its early-Fifties British roots, like many British motorcycles Royal Enfield’s familiar single-cylinder Bullet employs a separate engine and transmission with a chain-driven primary drive — as do even the newer “unit” engined Enfields; they may have fuel injection, but they still employ some old school technology.

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