After the introduction of the XT500 Yamaha's Swedish Distributor, Hallman & Eneqvist, came with the idea of building a 4-stroke Motocrosser.

On the 1977 Tokyo Motorshow Yamaha unveiled a stunning prototype V-Four.

Yamaha Motor N.V. in Amsterdam carried out a lot of special projects as far back as the early 1970's. One of these was the commission of asking NVT (Norton Villiers Triumph) in Andover, U.K. to research for a better handling XS650.

I received again some nice pictures of American riders with their TD1 powered dirt-track machines in the 1960's.