1970 Yamaha XS-1 650

The XS-1 was Yamaha's bold pivot from two-strokes to four-strokes, and they aimed directly at the Triumph Bonneville to do it. Same displacement, same parallel twin configuration, but with Japanese reliability and a lower price tag. Where the Bonneville leaked oil and demanded constant fettling, the XS-1 just worked. It wasn't as characterful as the Triumph — Yamaha was still learning four-stroke personality — but it was better-built and more affordable. The XS-1 launched an entire lineage of Yamaha twins and triples that would evolve through the XS650, TX series, and eventually into the modern XSR line. Every Yamaha four-stroke traces its DNA back to this motorcycle.

The XS-1 shares visual DNA with the British twins it was built to replace — upright stance, spoked wheels, chrome fenders, and a long horizontal engine. Paint was understated compared to Honda's candy colors — silvers, blacks, and dark metallics. The engine develops a warm, even patina across the cases, and the horizontally-split design is a visual signature. Chrome deteriorates at the typical rate. These bikes look best with honest mileage showing — the XS-1 was a working motorcycle, not a showpiece. The café racer community has consumed a lot of XS650s for conversions, which makes unmolested stock examples increasingly valuable.

The XS650 community (which encompasses the XS-1, XS-2, and later XS650 models) is massive and helpful. MikesXS.com has been the parts lifeline for decades. The parallel twin is straightforward — one cam, two carburetors, points ignition. Electronic ignition conversions are available and recommended. The engine is torquey and pleasant, though it vibrates more than Honda's twins because of the 360-degree crankshaft. Reliability is excellent by 1970s standards. The main ownership challenge is parts quality on reproductions — there's a lot of cheap stuff that doesn't fit right. Buy from reputable suppliers and you'll be fine.