In an attempt to cash in on the popularity of motocross and help bring a younger audience into the company fold, Yamaha released the Moto-Bike in 1974. Fitted-with oil-damped front forks, dual rear shocks and motorcycle-style everything, the Moto-Bike was supposed to bring MX capability to bicycles. Sadly, its designers failed to take one thing into account, the weight. All those features made the Yamaha-Motobike far heavier than more bicycle-like competitors, rendering it uncompetitive in BMX racing.
via Motorsport Retro