BIKE (UK)

HIGH MILERS

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Check high-mileage engines for a clackety sound coming from the lefthand side. That’s the sound of a loose cam chain, rattling as it runs between the crank and the camshaft. The sound will be louder on the overrun, too, as that’s when the chain is under less tension. The chains and tensioners are both pretty reliable – I’ve never seen one fail, but they do need adjustment from time to time.

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