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Looking here it seems the worm drive wasn't as bad as often reported. http://classicglory.co.uk/models.htm

However, to run a higher power engine a change to BMW-like spline geared shaft drive is a smart move. What else should we change for the 1946 launch of the Sunbeam S7, setting the marque for a successful S7 Deluxe and S8 in 1949?

Keep in mind the technological, and manufacturing limitations (including industrial relations) of late 1940s Britain (and Sunbeam's BSA ownership) and the markets needs and preferences of the time. For example, is a change to swing arm from plunger suspension likely?

If the target market is redefined as the North American interstate rider then a move to a 900cc twin wouldn't be ASB territory. The crankcase breather and other oil leak sources would need addressing.

Imo, BSA lost an opportunity to bring innovation to this sector with the S7. Let's try to make it right.
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