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British Motorcycles

Carfield 1925 Brass Filler Cap

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The brass petrol cap would be removed and held inverted under the oil tap, to be filled to a regulated amount to add to the petrol tank for the correct petrol-oil mix. The oil tank was therefore simply a reservoir; but separate petrol and oil compartments mimicked larger four-stroke motorcycles and added to the overall impression of a miniature version of a 500c machine.

Courtesy BuyVintage.com