BSA Sloper engines?

[mickattwo]

Can anyone help, I have two of these engines,one in good working order the other on a Ransome Marquis mower.I understand that these engines are Norton/Villiers F12 engines. Why are they called BSA Sloper engines on horticultural machinery?

[hillsider]

If I understand the story correctly both are correctly known as Sloper engines, the earlier engines were built, badged and sold by BSA and apart from the recoil start assembly I can’t think of many if any differences to the Villiers version of the engine.

If anyone can add to this historical thread I too would be interested to know more.

[Author]

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