The only 4 stroke British lightweights I can remember are the BSA Beagle, and the Ariel Pixie they fitted the engine to, and the Mercury Mercette, and it's brother, the Dunkley Whippet. Here are a Beagle and a Whippet. The Beagle was more common, and unreliable. The Beagle is very rare, and is slower, but might not fail as often.
Mercury Mercette
Ariel Pixie
Mercury Mercette
Ariel Pixie
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