Norton motorcycle englne and frame dating

NOC Factory Record certificates or information are not proof of identity or specification and may not be used for licensing purposes.

The numbers were consecutively allocated throughout a model range so as an example all B group machines were lumped together irrespective of whether they were a B25 or B44. Also this carried through to some but not all of the engines.matching engine markings.It is not the policy of the NOC to confirm any numbers from the records not provided by the applicant.In the case of non matching numbers the record will favour the frame, but the replacement Engine No.Some BSA & Triumph models had frame numbers near the front engine support - check your frame to or identification numbers.Below you will find both Triumph engine and frame numbers for Triumph 650 unit twins from 1963-1968 and a Triumph 650 models list from 1963-1968.Below you will find both Triumph engine and frame numbers for Triumph 350 and 500 unit twins from 1957-1974 and a Triumph models list from 1957-1974.

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