Norton Twins Camshaft Timing Chain (1) 06-7689 - 500 / 650 / 750 / 850 - (Andover) Triumph Fits BSA Pre-Unit Twins from

Fits BSA Pre-Unit Twins from the A7 & A10 from 1962-1963

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OEM part number is 39595

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Norton Twins Camshaft Timing Chain (1) 06-7689 - 500 / 650 / 750 / 850 - (Andover) Triumph Fits BSA Pre-Unit Twins fromA stretched timing chain can not only be dangerous if it where to break but it can also alter the cam timing (advance or retreaded) a few degrees. A change in cam timing will hurt your engines performance. This cam timing chain is made in England by Andover Norton. Replaces Norton part number 06 7689 and 067689. Fits all Norton twins (Dominator, Atlas, Commando, Roadster, etc) up to approx 1975. Please refer to your parts catalog for proper fitment.