Yamaha’s 1973 YZ637 works bike did more than simply win a 250cc world championship with Hakan Andersson aboard; it launched the single-shock, long-travel revolution
The First Monoshocker
Yamaha’s 1973 YZ637 works bike did more than simply win a 250cc world championship with Hakan Andersson aboard; it launched the single-shock, long-travel revolution