Two Stroke Racelab

1) Lambretta Tuning Manual by Dave Webster.  2) Lambretta Performance Tuning & Conversions Manual by "Scooter and Scooterist Production". A lot of info including tuning, conversions, carburettor and gearbox charts etc. from the Scooter and Scooterist Production and the well known Dave Webster. 

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.

Two Stroke Tuning by Roy Bacon (Transport Bookman Publications, 1981).

Two Stroke High Performance Engine Design & Tuning by Cesare Bossaglia (Lodgemark Press Ltd, 1972).

The High Speed Two-Stroke Petrol Engine by Philip H Smith, 2nd Edition, 1968 2stroke Bibliography Part of my two-stroke bibliography...on SpeedJunkies.