SFM/Sachs Speedjet RS [2013-2017] Review: A Compact Powerhouse for Urban Adventures
Introduction
The SFM/Sachs Speedjet RS (2013-2017) occupies a unique space in the world of compact two-wheelers. Designed as a 49cc two-stroke scooter, it blends minimalist design with urban practicality. While it might not dominate highway stretches, this nimble machine shines in crowded cityscapes where agility and fuel efficiency reign supreme. After spending time with this generation of Speedjet RS, it’s clear why it developed a cult following among commuters and lightweight motorcycle enthusiasts.
Design & Ergonomics
The Speedjet RS sports a sporty, angular design that stands out among its more rounded competitors. The sharp lines of the fairing and the aggressive headlight cluster give it a "pocket rocket" aesthetic, which feels purposeful even at first glance. The dual-tone paint schemes (often featuring bold red or black accents) amplify its youthful character.
With a seat height ranging between 800-840 mm (31.5-33 inches) depending on the model year, it accommodates shorter riders comfortably while still offering enough legroom for taller users. The split seat design provides just enough space for a rider and a small backpack, though don’t expect to haul groceries here – this is a solo commuter at heart.
The dashboard is refreshingly simple: an analog speedometer paired with basic warning lights. No frills, no distractions. The handlebars sit at a natural reach, and the floorboard offers adequate space for feet placement, though taller riders might find it slightly cramped during longer rides.
Engine & Performance
At its core lies a 49cc single-cylinder two-stroke engine, producing 3.2-3.8 PS (2.3-2.8 kW). While these numbers seem modest, the two-stroke nature delivers a punchy low-end torque that’s perfect for zipping through traffic. The Variomatic automatic transmission (a CVT system) ensures smooth acceleration without the hassle of gear shifts – a blessing in stop-and-go urban conditions.
Cold starts require a bit of patience, with the idle settling around 1,800 RPM. Once warmed up, the engine settles into a rhythmic hum. Top speed hovers around 60 km/h (37 mph) on flat roads, though steep inclines will test its limits. Where this engine truly shines is fuel efficiency: the 4.7-6.0-liter fuel tank (depending on model year) delivers a range of 150-200 km (93-124 miles), making it ideal for daily commutes.
The two-stroke soundtrack – a mix of high-pitched whine and occasional burbles – adds character, though it won’t appeal to those seeking refinement. Maintenance is straightforward (more on that later), but remember: this engine thrives on regular care.
Handling & Ride Experience
Weighing just 92-98 kg (203-216 lbs), the Speedjet RS feels almost telepathic in city traffic. The telescopic front fork and rear monoshock handle potholes better than expected, though sharp bumps will remind you this is a budget-focused machine.
At low speeds, the steering is light and precise, allowing for easy U-turns and lane filtering. The 2.00 BAR (29 PSI) front and 2.25 BAR (32.6 PSI) rear tire pressure settings strike a balance between grip and rolling resistance. Braking is handled by a single disc upfront and a drum at the rear – adequate for its speed class, though aggressive riders might crave more bite during sudden stops.
On open roads, the lack of wind protection becomes apparent above 50 km/h (31 mph), but that’s not where this scooter belongs. Its natural habitat is a maze of side streets and crowded intersections, where its compact dimensions and peppy acceleration make it a joy to ride.
Competition
The Speedjet RS faced stiff competition during its production years:
- Honda Vision 50: More refined and fuel-efficient (four-stroke engine), but lacks the Speedjet’s sporty edge.
- Yamaha Aerox 50: A stronger performer with liquid cooling, but heavier and pricier to maintain.
- Peugeot Speedfight 50: Similar sporty styling, but less reliable electronics.
Where the Speedjet RS stands out is its balance of simplicity and personality. While rivals often prioritized comfort or technology, Sachs focused on delivering a raw, engaging ride. The air-cooled engine might lack sophistication, but it’s easier and cheaper to maintain than liquid-cooled competitors. For riders valuing mechanical simplicity with a dash of attitude, the Speedjet remains compelling.
Maintenance
As a MOTOPARTS.store journalist, I must emphasize: proper maintenance is critical for keeping this two-stroke humming. Here’s what owners need to know:
- Oil System:
- Uses 2-stroke oil (API TC/JASO FC spec). Always premix fuel correctly – a 50:1 ratio is typical.
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Consider upgrading to synthetic oils for cleaner combustion and reduced spark plug fouling.
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Spark Plugs:
- Specs call for NGK BR7ES or BPR7HS (check model year).
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Maintain a 0.6-0.7 mm electrode gap. Carry a spare plug – two-strokes are notorious for fouling them during cold starts.
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Drivetrain:
- The Variomatic belt system requires periodic inspection. Replace belts every 8,000-10,000 km (5,000-6,200 miles).
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Final drive oil (80W-90 GL5) changes every 5,000 km (3,100 miles) prevent premature wear.
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Cooling:
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Later models with 1.5L liquid cooling need annual coolant flushes. Check for leaks around the radiator hoses.
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Brakes:
- DOT 4 fluid absorbs moisture quickly – flush annually. Upgrade to sintered brake pads for improved stopping power.
Pro Tip: Clean the carburetor every 3,000 km (1,864 miles) if using ethanol-blended fuels. A clogged carb is the #1 cause of poor performance in these engines.
Conclusion
The SFM/Sachs Speedjet RS (2013-2017) isn’t about cutting-edge tech or long-distance comfort. It’s a back-to-basics urban warrior that rewards hands-on owners. For new riders, it offers forgiving mechanics and low running costs. For veterans, it’s a canvas for customization – whether upgrading exhausts or tweaking CVT weights.
While newer electric scooters might grab headlines, there’s something irreplaceable about the Speedjet’s analog charm. It’s a reminder that sometimes, less really is more – especially when “less” comes with a raspy two-stroke soundtrack and the ability to park anywhere.
Ready to keep your Speedjet RS running strong? MOTOPARTS.store carries everything from NGK spark plugs to premium 2-stroke oils. Browse our Sachs-compatible parts catalog and give your ride the attention it deserves.
