 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.