The first variable timing systems offered on internal combustion engines, powervalves were designed to allow your two-stroke to be both tractable and exciting. Here are the essentials on what they consist of, the different systems and how they function

The no-nonsense guide to amazing bikes for £3000 or less

WHAT’S NEW IN TECH?

GET PROTECTED AT MCNCOMPARE.COM Kawasaki Vulcan S £7275 ...

Porsche has hybridised the flagship 911 – and brought it back to life in the process, creating a thrillingly usable new performance car

Because motorcycle engineering is beautiful