Triumph Pre-Unit Twins by Matthew Vale

From the Speed Twin to the first Bonneville, this glossy hardback tells the story of Turner’s iconic twins… Crowood’s MotoClassics series has gradually evolved over the years, so I suppose I shouldn’t have been too surprised to discover that the latest volume in the range is a slightly different format to its predecessors. Spooky, actually: most motorcycle models get bigger…

Yamaha RD400

Before there was Elsie, Yamaha built an equally memorable two-stroke tearaway. Anarchy shows us his 400C… Although there’s an inevitable family resemblance between the RD400 and the 350 which preceded it, the 40bhp two-stroke had been considerably developed to make it bigger, smoother, quieter, faster and longer-lived. Yamaha increased the engine stroke to add 51cc to the engine capacity, which…