Immediately after the war Villiers picked up where they had left off, with supply of the 269 cc engine, now as the Mark II engine with different method of attaching the exhaust. By 1919 the bikes that used the Villiers engines included the Excelsior lightweight, the Diamond (D.F.& M. Engineering Co), the Royal Ruby, the Wolf Lightweight (Wulfruna Engineering), the Carfield, the Ruffells, the P.V. (Elliston & Fell), the Sparkbrook, the Yvel, the P&S lightweight (Pearson and Sopwith), the Chater-Lea, the Campion, the Victoria (of Glasgow), the Hobart, the Olympic, the Ixion, the Bown-Villiers, the Wilkin, and the Saltley. The engine remained much the same, and continued to use a separate magneto, though it did have an oil pump to provide crankcase and piston lubrication via a hollow crankcase bolt – a design that Villiers had patented during 1914/1915. The Mark III engine embodied some changes to crankcase and brushes in 1919/1920, and in March 1920 the new Villiers Mark IV engine complete with flywheel magneto was revealed. In May 1920 a new British Excelsior lightweight model was announced, this being the first motorcycle to show the new Villiers engine using the flywheel-magneto instead of a separate magneto. In September 1922 Villiers announced the details of their new 1923 engine range, which included 147 cc, 250 cc and 343 cc engines. These engines featured a radial-finned cylinder head, with both the inlet and exhaust port being at the front of the engine, and they all had the Villiers flywheel-magneto. While the 147 cc relied on petrol-oil mixture for crankshaft lubrication, the two larger engines used a separate oil-feed system. The new 250 cc engine produced 25 per cent more power than the older 269 cc engine. In 1926 Villiers introduced an even smaller engine, the 125 cc with twin exhaust ports and side-mounted carburettor, and in 1927 they introduced the 344 cc twin 2-stroke. Villiers were to go on to produce a wide range of single and twin cylinder 2-strokes primarily for motorcycle use. At the end of the 1920s they also started producing engines for stationary use, with the first model being the water-cooled WX11 and in 1933 the air-cooled Mar-vil. Villiers engines were also used in lawn mowers, for example the 147 cc engine was used in the
Atco mowers of the 1920s and in 1931 it was joined by a 98 cc Villiers engine, known as the Midget. The Villiers company also had links to the
British Seagull outboard marine engines, both companies owing their existence to
John Marston. The Seagull engines initially used the Villiers flywheel magneto, and a 'Seagull-Villiers' carburettor. In 1936,
L. E. Baynes and
Sir John Carden, trading as Carden-Baynes Aircraft of
Heston Aerodrome, launched the
Carden-Baynes Auxiliary, a light aircraft which was essentially a motorized
Abbott-Baynes Scud 3 glider. This carried a retractable 249 cc Villiers engine driving a push-propeller and producing 9 bhp, and the fuel tank held enough to run the engine for thirty minutes. The 249 cc Carden-Baynes Auxiliary is believed to be the lowest-powered aircraft in the history of powered flight. ==Production during the Second World War==