Hello burgo60 and Millzy.

I do feel we need some images on this one.
A 1974 imperial would not have had a Briggs engine.
In fact, no Imperial used Briggs & Stratton.

I have a history record here:-
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=72729

Hope this helps.
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Jack