The very first prototype machine was this one. For the Yamaha model, the exhaust downpipes were connected to the silencers with aircraft-type "flex" tubing. In the background you see Bob Trigg (he looks like he is hiding away from his concept!). Behind the bike are Mr. Matsuda, Yamaha's Product Planner and Paul Butler (now IRTA Chief), who at that time, was Product Planning Manager at Yamaha Amsterdam.

Yamaha XS650/NVT prototype bike