01/06/2009
In the illustrious history of motorcycling, few machines evoke the same level of nostalgia and passionate discussion as Yamaha's two-stroke offerings. Among them, the Yamaha RXS 100 stands as a significant, albeit sometimes overshadowed, sibling to the legendary RX 100. These motorcycles, with their distinctive two-stroke roar and exhilarating power delivery, carved a niche for themselves, captivating riders across generations. This article delves into the specifics of the Yamaha RXS 100, exploring its features, performance, and its place within the broader legacy of Yamaha's iconic two-stroke machines, particularly in comparison to the much-revered RX 100.
The Yamaha RXS 100: An Overview
The Yamaha RXS 100 model is a motorbike manufactured by Yamaha, designed to offer a blend of performance and practicality. It encapsulates the raw, unadulterated essence of two-stroke motorcycling, a characteristic that has endeared it to many. While often associated with its more famous counterpart, the RXS 100 boasts its own unique attributes that warrant a closer look.
Engine & Performance
At the heart of the Yamaha RXS 100 lies a two-stroke, air-cooled, single-cylinder engine with a displacement of 100cc. This compact yet potent powerplant is designed to deliver a lively performance characteristic of its era. While specific power and torque figures for the RXS 100 aren't explicitly detailed, its sibling, the RX 100, produced around 11 horsepower and 10.4 Nm of torque, giving us an indication of the kind of spirited output one might expect. The kick-start mechanism is a classic feature, reinforcing its vintage appeal and hands-on riding experience.
Transmission & Handling
One notable feature of the RXS 100 is its 5-speed manual transmission, a step up from the 4-speed unit found in some other models from the same lineage. This extra gear allows for greater flexibility in power delivery and potentially better highway cruising capabilities. The motorcycle employs a wet, multi-plate, cable-operated clutch, ensuring smooth and reliable gear changes. This setup contributes to a riding experience that is both engaging and relatively straightforward for riders accustomed to manual transmissions.
Top Speed & Fuel Economy
When it comes to speed, the Yamaha RXS 100 is quite capable. It can reach a maximum top speed of approximately 120 Kmph (around 75 mph). Under normal conditions, it's comfortable cruising at speeds of about 68 mph. Interestingly, some reports suggest it can achieve speeds of up to 80 miles per hour when the engine is running at optimal (and perhaps extremely hot) conditions, showcasing its underlying performance potential. In terms of fuel efficiency, the RXS 100 offers approximately 32-35 kilometres per litre, which, while not comparable to modern four-stroke bikes, was respectable for a two-stroke machine of its time.
Visuals & Features
The RXS 100 was available in a range of classic colours including White, Navy Blue, Grey, and Red, allowing riders to choose a style that suited their preference. While specific design elements aren't extensively detailed, one can infer a timeless, minimalist aesthetic typical of roadsters from that period – a design that continues to hold appeal for classic bike enthusiasts.
The Enduring Appeal of the Yamaha RX 100
It's impossible to discuss the RXS 100 without acknowledging its highly celebrated relative, the Yamaha RX 100. This motorcycle has achieved nothing short of a cult status in the motorcycling world. Even years after its discontinuation, the RX 100 remains a highly coveted machine, with aficionados willing to pay a premium for well-maintained or expertly restored examples. Its legend stems from a combination of factors: its exhilarating power-to-weight ratio, distinctive exhaust note, and robust build quality.
Why the RX 100 Became a Legend
The Yamaha RX 100, powered by a 98cc two-stroke single-cylinder engine, produced 11 Hp of power and 10.4 Nm of torque. This raw power, combined with its lightweight chassis, made it incredibly agile and quick off the mark. The engine's aural performance alone was enough to give many two-stroke enthusiasts goosebumps. For many, it represented freedom, speed, and a visceral connection to the road that modern, more refined bikes often struggle to replicate. Its simplicity also meant it was relatively easy to maintain and repair, contributing to its longevity and widespread appeal.
Two-Stroke Technology: Power, Emissions, and Maintenance
Both the RXS 100 and RX 100 are prime examples of two-stroke engine technology. While offering impressive power output for their size, two-stroke engines operate differently from their four-stroke counterparts, with significant implications for efficiency and environmental impact.
The Two-Stroke Engine Explained
A two-stroke engine completes a power cycle in just two strokes of the piston, compared to four strokes in a four-stroke engine. This allows for a power stroke in every revolution of the crankshaft, leading to higher power output for a given engine size. However, this design typically means that the engine burns a mixture of fuel and oil (2T oil) for lubrication. This oil, along with some unburnt fuel, exits through the exhaust, leading to visible smoke and higher emissions.
Efficiency & Environmental Concerns
Approximately 30% of the fuel in a two-stroke engine can leave the pipes unburnt. This, coupled with the burning of 2T oil, results in higher levels of smoke and hydrocarbon emissions compared to modern four-stroke engines. The RX 100's mileage of 32-38 kmpl (with ARAI claiming up to 40 kmpl) highlights this. To put it in perspective, a contemporary 100cc four-stroke motorcycle, while potentially less powerful, can achieve fuel economy figures between 55 kmpl and 80 kmpl. This environmental impact is a significant reason why two-stroke motorcycles like the RX 100 were eventually discontinued in many markets, giving way to stricter emission standards.
Keeping the Legend Alive: Re-registration and Restoration
Despite their discontinuation, the allure of the Yamaha RXS 100 and RX 100 persists. Many enthusiasts are dedicated to preserving these machines, which often involves navigating the complexities of re-registration and the meticulous process of restoration.
In various parts of the world, governments are implementing stricter regulations to curb air and noise pollution, particularly in urban areas. This often impacts older vehicles, including two-stroke motorcycles. Owners of classic two-stroke bikes may face additional hurdles, such as environmental fees or 'Green Taxes', levied to discourage the re-registration of older, more polluting vehicles. While specific costs vary by region, the process can involve significant fees and adherence to updated regulations, making it a commitment for owners to keep their beloved machines road-legal.
The Restoration Journey
For those looking to bring an RX 100 or RXS 100 back to its former glory, the restoration process can be a rewarding endeavour. The RX 100, in particular, is considered relatively less complicated to restore compared to some other vintage motorcycles like Yezdis or BSAs. Parts for the RX 100 are generally easier to source, which greatly facilitates the restoration journey. The key to a successful restoration often lies in finding a competent mechanic who possesses a deep understanding and experience with two-stroke engines. The cost of restoring an RX 100 can range significantly, typically from around £250 to £350, excluding acquisition, registration, and tax fees, depending on the condition of the bike and the extent of work required.
Comparative Glance: Yamaha RXS 100 vs. RX 100
While sharing a common lineage, there are distinct differences between these two iconic models:
| Feature | Yamaha RXS 100 | Yamaha RX 100 |
|---|---|---|
| Engine Displacement | 100cc | 98cc |
| Engine Type | Two-stroke, Air-cooled, Single-cylinder | Two-stroke, Air-cooled, Single-cylinder |
| Transmission | 5-speed manual | 4-speed manual |
| Maximum Power | (Not specified for RXS 100) | 11 Hp @ 8500 rpm |
| Maximum Torque | (Not specified for RXS 100) | 10.4 Nm @ 8000 rpm |
| Top Speed (Approx.) | 120 Kmph (75 mph) | (Not specified, but generally comparable) |
| Fuel Economy (Approx.) | 32-35 kmpl | 32-38 kmpl (ARAI: up to 40 kmpl) |
| Clutch Type | Wet, multi-plate, cable operated | Wet, multi-plate |
| Start Mechanism | Kick Start | Kick Start |
Frequently Asked Questions (FAQs)
How much does it cost to purchase a used Yamaha RX 100 motorcycle?
As the Yamaha RX 100 has been officially discontinued, new models are not available. In the used market, prices for a clean RX 100 can vary significantly. Depending on its condition, a used RX 100 might cost anywhere from £100 to £500. Exceptionally well-preserved or meticulously restored examples, especially those considered 'out-of-the-factory' condition, can command prices well into four figures, reflecting their collector's value and the bike's enduring legacy.
How much does it typically cost to restore a Yamaha RX 100?
Apart from the initial purchase cost, restoring a Yamaha RX 100 can typically range from £250 to £350. This estimate depends heavily on the bike's initial condition and the extent of the restoration work required. This figure generally does not include any potential re-registration fees or environmental taxes that might apply.
What are the approximate costs to re-register an older Yamaha RX 100?
The cost to re-register an older Yamaha RX 100 can be around £100 to £150. This estimate is subject to local regulations, the bike's documentation, and any penalties levied by the vehicle registration authority. It's important to note that this figure typically does not cover the cost of pollution certificates or insurance premiums, which are additional expenses for road legality.
Conclusion
The Yamaha RXS 100, alongside its celebrated sibling the RX 100, represents a significant chapter in motorcycling history. These two-stroke machines, with their distinctive character, engaging performance, and undeniable charm, have left an indelible mark on riders. While modern regulations and environmental concerns have led to their discontinuation, their spirit lives on through dedicated enthusiasts who continue to cherish, restore, and ride these classic icons. Owning an RXS 100 or RX 100 today is not just about having a mode of transport; it's about embracing a piece of motorcycling heritage, a connection to a bygone era of raw power and thrilling simplicity that continues to captivate hearts.
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