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Hi Ian its in the Technical section under Amal carburetters. One and 1/4 inch x 24TPI. Regards John
email (option): ukcarbsathotmail.com
Thanks John...That should have been the first stop....:flushed: ....Ian
email (option): ian@wright52.plus.com
Adapters are available from Hitchcock Motorcycles. So no need to make one. https://accessories.hitchcocksmotorcycles.com/Amal-Carburettors/Air-Intake-Adapter/19215