The Yamaha XS750, a motorcycle that emerged from the vibrant and competitive motorcycle scene of the late 1970s, is more than just a footnote in history. It’s a testament to a time when manufacturers were experimenting with new configurations and engineering solutions to stand out from the crowd. While the era was largely dominated by inline-four motorcycles, Yamaha dared to be different, introducing an inline-three cylinder engine with a unique character and sound. The XS750’s blend of performance, style, and innovative features made it a standout machine, a classic that continues to captivate enthusiasts today.
The Triple Threat: Engine and Performance
The heart of the XS750 is its 747cc, air-cooled, DOHC, inline-three cylinder engine. This “triple” configuration was a bold choice, giving the bike a distinct personality. The engine’s firing order produced a unique, throaty exhaust note that was often compared to an inline-six, setting it apart from the high-pitched screams of its four-cylinder rivals. The engine was designed for a broad and accessible powerband, with a healthy dose of low-end grunt that made it enjoyable for both city riding and highway cruising.
With a factory-rated power output of around 64 horsepower, the XS750 was competitive for its time. However, its real strength was its torque delivery. The engine felt robust and responsive, pulling smoothly from low RPMs and building to a satisfying surge of power in the mid-range. This made for a more relaxed and less frantic riding experience compared to some of its peaky contemporaries. The engine’s design was also notable for its use of dual overhead cams, which was a performance feature more commonly found on race bikes of the era.
A Nod to Innovation: Shaft Drive and Handling
Perhaps the most significant and forward-thinking feature of the XS750 was its use of a shaft drive. While chain drives were the standard for most motorcycles, Yamaha opted for a shaft drive to offer a low-maintenance, clean, and quiet final drive system. This was a feature more commonly associated with larger touring bikes like those from BMW, and its inclusion on a sportier motorcycle was a significant selling point. The shaft drive eliminated the need for chain lubrication and adjustment, making the XS750 an excellent choice for daily commuting and touring.
The XS750’s handling was also praised in its day. The bike’s narrow profile, a benefit of the three-cylinder engine, gave it a feeling of agility that belied its approximate 550-pound curb weight. The chassis, while not as stiff as modern bikes, provided a comfortable and predictable ride. The dual disc brakes up front and a single disc in the rear offered good stopping power for the era. The upright and comfortable riding position, with a well-padded seat, made it a great motorcycle for long rides.
A History of Evolution: From “C” to “SE”
The XS750 was not a static model; it evolved throughout its production run from 1976 to 1979.
- 1976 XS750C: The initial model, sometimes referred to as the “Bargain BMW,” was praised for its unique features and value. It had a “3-into-1” exhaust system and a separate regulator and rectifier.
- 1977 XS750D and 2D: This year saw improvements in reliability, particularly to the engine’s second gear, which had a tendency to slip on early models. The exhaust system was also changed to a “3-into-2” configuration with a muffler on each side, giving it a more balanced look.
- 1978 XS750E and SE: This was a significant year for the XS750. Yamaha introduced electronic ignition, which allowed them to raise the rev limit and improve performance. The carburetors were also updated to the Mikuni “Mark II” CV models, which offered easier maintenance. The “SE” model, or “Special,” was introduced as a factory custom with longer front forks, a teardrop-shaped tank, and a different seat, capitalizing on the chopper aesthetic popular at the time.
- 1979 XS750F and SF: The final year of the XS750 saw minor updates before the model was replaced by the larger displacement XS850.
The Modern Classic: Ownership and Customization
Today, the Yamaha XS750 is a beloved classic, popular with collectors and custom builders alike. Its distinct engine configuration, combined with the shaft drive, makes it a unique platform for a variety of styles, from cafe racers and brat-style bikes to stock restorations.
However, owning a vintage motorcycle like the XS750 comes with its own set of challenges. Potential owners should be aware of a few common issues:
- Carburetor Maintenance: While the Mikuni CV carbs are generally reliable, they are complex and can be finicky. Gummed-up jets and vacuum leaks are common on bikes that have been sitting for a long time. Carburetor synchronization is a critical maintenance task for these triples, and it requires a specific tool to do correctly.
- Electrical Issues: Like many bikes from this era, the XS750 can suffer from electrical gremlins, particularly with the voltage regulator, ignition coils, and wiring.
- Final Drive: While the shaft drive is low maintenance, it’s not maintenance-free. The splines need to be inspected and lubricated periodically, and the oil in the final drive case needs to be changed.
Despite these potential issues, the XS750 remains a highly rewarding motorcycle to own. The availability of parts is still surprisingly good, thanks to a dedicated community and specialized vintage parts suppliers. Its unique sound, smooth power delivery, and classic styling make it a joy to ride and an excellent project for a home mechanic.
The Yamaha XS750 is a motorcycle that dared to be different. In a world of fours, it was a triple. In a world of chains, it was a shaft. This unconventional approach gave it a character and appeal that continues to resonate decades later, solidifying its place not just as a vintage bike, but as a true classic.