CarBrandLogos archive · Yamaha · 1968
Japan's answer to the British vertical twin, and it outlasted the originals.
Discover the storyPhoto: PekePON · CC BY-SA 3.0
The story
Explore the ideas, engineering and context that shaped the Yamaha XS650, then continue into its specifications and place in the marque's lineage.
01
Yamaha had built its reputation on two-strokes, and in the late 1960s it had no four-stroke road bike at all. The XS650, launched for 1970, was the fix — and rather than invent a new format, Yamaha built the format British manufacturers had made famous: a 654cc air-cooled parallel twin, single overhead camshaft, two valves per cylinder, in a simple frame with a five-speed gearbox.
Yamaha XS 650 mg 4900 · Rama · CC BY-SA 2.0 fr
02
The difference was in the details. The engine used horizontally split crankcases and roller-bearing crank construction, it did not leak oil, and it started reliably. Buyers who liked the character of a Triumph Bonneville but had grown tired of maintaining one found the Yamaha delivered the same thump with none of the anxiety, and it arrived just as the British industry was collapsing.
Point Ignition · Pwiszowaty · CC BY-SA 3.0
03
America took it furthest. The engine's flat torque made it a natural for dirt-track racing, and tuners built XS650-powered flat trackers that ran competitively against Harley-Davidson's XR750 — Kenny Roberts famously raced Yamaha's twin-engined variant of the era before his road racing career took over. Off the track, the simple frame and narrow engine made the XS650 the default donor bike for chopper and bobber builders, a role it still fills.
Advance mechanism · Pwiszowaty · CC BY-SA 3.0
04
Production ran to 1985, longer in some markets than others, and the bike has never really gone away. When Yamaha returned to the retro standard with the XSR700, it was explicitly building on this bike's reputation.
At a glance
Produced
1970–1983Technical specification
Contemporaries from the 1960s
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