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A collection of modifications developed over 32 years riding BSA singles and Triumph twins. How to make single leading shoe brakes provide real stopping power. Almost all sls brakes have an inbuilt design flaw now described for the first time in print. The simplest fix costs nothing and can be completed in an hour. Improve the performance of your electrical system. Have a headlamp as bright as a modern car, extend your battery life and make blown bulbs a thing of the past. How to get the best from your ignition system whether electronic or contact breaker. A detailed look at Concentric mark 1 carburettors to help ensure you are using the right components. Is your bike being held back by a bad silencer? Baffle design is key to good performance. Find out what works and what doesn't. Modifications to cylinder heads and rockerboxes to improve longevity and stop oil leaks. Plus mods and advice on clutches, gearboxes, tyres, steering head bearings and many other topics. 30000 words, 36 diagrams