Rieju MR300i: A New Era of Fuel-Injected Two-Strokes

Rieju MR300i: A New Era of Fuel-Injected Two-Strokes

The world of off-road motorcycling is constantly evolving, and Rieju is making a significant statement with the introduction of their all-new MR300i Pro and MR300i Racing models. These aren't just minor updates; they represent a bold leap forward for the Spanish manufacturer, marking a milestone in their 80-plus-year history. For years, Rieju has been known for its expertise in smaller capacity bikes, but with the acquisition of the former GasGas platform in 2020, they have steadily climbed the ranks in the global market, making their presence felt in top-tier racing series. Now, with the MR300i, they've developed their own, proprietary fuel-injected two-stroke engine, setting a new benchmark for their enduro offerings.

Home-Grown Innovation: The Dual-Injector Engine

At the heart of the new MR300i models lies a completely redesigned engine, conceived, developed, and manufactured in Spain. What sets this engine apart is its innovative dual-injector throttle body. Unlike many competitors, Rieju has implemented two injectors that operate independently, each targeting different points in the power curve. One injector handles the lower RPM range, while the second takes over at higher revs. Rieju claims this setup meticulously replicates the feel and response of a traditional carburettor, a welcome departure from the sometimes overly linear power delivery of other fuel-injected two-strokes. This focus on 'carb-like' feel is a significant talking point, suggesting a more engaging and intuitive riding experience.

Beyond the dual-injector system, the new engine boasts a counterbalance shaft, a crucial addition for eradicating the vibrations that plagued previous models. This not only enhances rider comfort, reducing fatigue in the hands and feet, but also contributes to a more cohesive and precise chassis feel. The rider feels more connected to the machine, allowing for sharper, more accurate inputs. Furthermore, the MR300i features a diaphragm clutch, offering improved feel and consistency. This clutch is also adjustable, providing three different settings to tailor the lever feel and engagement to suit various riding disciplines, from aggressive hard enduro to relaxed trail riding.

Riding Impressions: A Refined Two-Stroke Experience

During an initial test ride in Catalonia, the MR300i models showcased a remarkably refined performance. The throttle connection is precise, with clean fuelling throughout the rev range, seamlessly integrated with the six-speed gearbox. While not a perfect 1:1 replication of a carburettor, the dual-injector system comes remarkably close, offering a distinct character compared to the more linear power delivery of some Austrian rivals. Even as pre-production models, the bikes exhibited impressive polish, with no discernible issues reported during the test.

The MR300i proved its mettle across a variety of challenging terrains. From steep, rocky climbs demanding precise low-end control to rapid fifth-gear blasts, the engine performed flawlessly. The fuelling remained consistent, regardless of riding style, whether lugging the engine in a high gear or revving it out. The 300cc two-stroke motor delivered the potent power expected, with a well-tempered low-end response that aids rear-wheel grip – a vital characteristic for enduro riding. The power delivery builds strongly, providing ample punch for even the most demanding situations.

Three Usable Power Modes

Rieju has equipped the MR300i with three distinct power modes, easily selectable via a button on the left handlebar. These modes – Race, Forest, and Wet – offer riders the flexibility to adapt the engine's characteristics to different conditions. The modes are indicated by the number of flashes on the handlebar-mounted button, with a brief press-and-hold engaging the desired map. During testing, 'Forest' mode (Map 2) proved particularly effective on technical hard enduro sections, providing crucial low-end feel and drive without sacrificing the mid-range surge needed to overcome obstacles. The 'Wet' mode (Map 3) offers a more linear power delivery, ideal for slippery conditions or a more relaxed trail riding experience, while still retaining ample power. While the 'Race' mode (Map 1) offers full power, the 'Forest' mode often proved more manageable and confidence-inspiring in challenging terrain.

Further customisation is available through plug-in software at Rieju dealerships, allowing for fine-tuning of fuelling, ignition timing, and map profiles. This opens up possibilities for riders to tailor the engine's performance precisely to their preferences, whether for specific racing disciplines or general trail riding.

Premix Fuel: A Deliberate Choice

The decision to run on premix fuel, rather than a separate oil injection system, is a deliberate one for Rieju. They cite the more traditional 'race bike' feel and the reduction in weight and mechanical complexity as key advantages. While some may debate the merits of premix versus oil injection, Rieju's approach minimises potential points of failure, such as oil pump malfunctions or blocked oil lines, which can lead to catastrophic engine damage. A minor observation during the test was the fuel consumption, which appeared to be on the higher side compared to some competitors, with the test bike requiring a significant amount of fuel within a couple of hours of riding.

Chassis and Handling: A Refined Foundation

While the engine is a significant departure, much of the MR300i's chassis remains familiar, built upon the proven steel backbone frame and aluminium chassis and swingarm. The KYB suspension, tuned to Rieju's specifications, is a significant contributor to the bike's handling prowess. A key change in the new models is the engine's mounting position, pivoted slightly further forward. This revised geometry shifts more weight to the front end, enhancing front-end feel and improving cornering accuracy. This subtle adjustment makes a noticeable difference, particularly when compared to previous models that exhibited a less communicative front end.

It's worth noting that the test was conducted on pre-production models fitted with standard tyres and higher pressures for the hard-pack conditions, which slightly masked the full potential of the chassis and suspension. However, the inherent quality of the KYB components, especially the DLC-coated forks on the Pro model, is evident. Both models offer a broad range of adjustability, allowing riders to adapt the suspension from soft trail settings to a more aggressive motocross setup with simple adjustments. This level of adjustability, combined with the overall quality of components, further enhances the value proposition of the Rieju MR300i, especially considering its competitive price point.

Two Models: Racing vs. Pro

Rieju offers the MR300i in two distinct variants: the MR300i Racing and the MR300i Pro. While both bikes share the same core engine and chassis, the Pro model benefits from a range of upgrades designed to enhance performance and aesthetics. Key differences include:

The Pro model is priced approximately €1,000 higher than the Racing model, a justifiable increase given the nearly €2,000 worth of added components. The MR300i Racing is priced at €9,099 / £8,195, while the MR300i Pro retails for €9,999 / £9,195.

Final Thoughts and Verdict

The new Rieju MR300i models leave a strong positive impression. Rieju has not only met expectations but exceeded them with a powerful 300cc two-stroke engine that offers a compelling blend of performance and rider engagement. For riders who have been hesitant to embrace fuel injection, the MR300i presents an attractive proposition, delivering a familiar yet improved riding experience. With competitive pricing and a robust list of quality components, these bikes represent excellent value for money in the 300cc two-stroke enduro segment.

While some minor aspects, such as the starter motor engagement and the initial rider comfort, might require some fine-tuning, these are minor quibbles in an otherwise highly impressive package. The availability of an online 'One to One' customisation system and projected delivery timelines suggest a well-thought-out launch strategy. Rieju's commitment to parts supply and customer support further bolsters their position in the market. The MR300i is a testament to Rieju's progress, offering a potent and refined machine that stands shoulder-to-shoulder with its established rivals.

Frequently Asked Questions (FAQ)

Q1: Are the Rieju MR300i models fuel injected?
Yes, both the MR300i Pro and MR300i Racing models feature a sophisticated fuel-injected two-stroke engine system.

Q2: What is unique about the Rieju MR300i engine?
The engine utilises a dual-injector throttle body, with each injector operating at different RPM ranges to provide a more carburettor-like throttle response.

Q3: Does the MR300i have a counterbalance shaft?
Yes, the new engine is equipped with a counterbalance shaft to significantly reduce vibrations.

Q4: What are the differences between the MR300i Racing and Pro models?
The Pro model features higher-specification components such as DLC-coated forks, Renthal handlebars, X-Trig triple clamps, and Michelin tyres, differentiating it from the Racing model.

Q5: Do the bikes use premix fuel?
Yes, Rieju has opted for a premix fuel system for the MR300i models.

Q6: How is the chassis handling on the MR300i?
The chassis has been refined with the engine mounted slightly further forward, improving front-end feel and cornering accuracy. The KYB suspension offers excellent performance and adjustability.

Q7: What are the pricing details for the MR300i models?
The MR300i Racing is priced at €9,099 / £8,195, and the MR300i Pro is priced at €9,999 / £9,195.

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