Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 138,146 pages of information and 223,038 images on early companies, their products and the people who designed and built them.
Power-Pak were clip-on units for motorcycles produced between 1950 and 1956.
This clip-on unit was first used to power a standard bicycle and was a 49cc two-stroke that hung over the rear wheel, which it drove by friction roller. It had a flywheel magneto, petroil lubriction and the fuel tank fitted over the crankcase.
In 1956 the company tried to create a moped by adapting the engine to fit under the bottom bracket of a special frame. This idea was a failure.
The British Motorcycle Directory - Over 1,100 Marques from 1888 - by Roy Bacon and Ken Hallworth. Pub: The Crowood Press 2004 ISBN 1 86126 674 X