Kiwis have always been innovative. Burt Munro, Kim Newcombe and John Britten are just a few that come to mind. But what of earlier motorcycle engineering geniuses in New Zealand?
This is a 1919 Douglas that started out as a standard twin cylinder 2 3/4 hp side valve engine and was converted to an OHC in 1921 by W.M. Davy from NZ. Being a OHC with new homemade cylinder heads and open cam chain drives (good to get your dress trousers caught in) would definitely have been leading edge technology.
The Mechanics –
To appreciate the enjoyment of riding vintage machinery an understanding of the basic differences within the design of veteran and vintage motorcycles is required -
With the exception of a few machines most pre 1929 motorcycles have a ‘total loss oiling system’ (oil doesn’t have a return feed to the oil tank).
There may be a need in certain circumstances to supplement the main oil supply with an extra charge of oil into the engine from the ‘Auxiliary Hand Pump’.
. . . → Read More: Vintage Motorcycle Fundamentals