The motorcycle archive is still well loaded with what are best described as Custom Choppers, either professional or amateur built, to clear up a lot of these would it be acceptable to define these as exactly that (preferably with an engine manufacturers name and type where possible)?

e.g. Harley Knucklehead chopper, Honda 750 chopper etc?

There is a slight possibility that something with an engine from a specialist manufacturer (S&S) might slip through as a Harley by mistake, but where there is doubt I hope I can identify those on sight (Harleys are 45 deg V twins where S&S are 56 deg).

What do you think?