Two Stroke Motor Cycles Books by the Staff of "The Motorcycle".
1st) Two Stroke Motorcycles, 6th Edition, no year mentioned but should be around late '30s.
2nd) Two Stroke Motorcycles and how to get the best from them, 12th Edition, 1958
Very enjoyable books especially the old advertisements and old school tuning and maintenance of 2T engines.
Plenty of photographs, designs and info for Villiers, DKW, Commodore 250 etc. How to prepare cylinders, cylinder rings and also maintain brakes and forks.
A valuable read especially for British Bikes of the 40's & 50's.