MBK 50 Nitro (1997–2012): A Timeless Urban Warrior

Introduction

The MBK 50 Nitro, produced from 1997 to 2012, is a scooter that embodies the spirit of urban mobility with a dash of sporty flair. Designed for riders who crave practicality without sacrificing style, this two-stroke machine carved its niche as a reliable workhorse for city commutes and weekend joyrides. Despite its modest 49 cc engine, the Nitro’s liquid-cooled powertrain, aggressive styling, and nimble handling make it a standout in the crowded 50 cc scooter segment. After spending a day weaving through traffic and testing its limits on winding roads, it’s clear why this model enjoyed a 15-year production run.

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Design & Ergonomics: Sporty Minimalism

The MBK 50 Nitro’s design screams “urban agility.” With sharp lines, a compact frame (1,743 mm / 68.6 inches in length), and a low-slung seat height of 828 mm (32.6 inches), it’s built to slice through traffic while keeping riders firmly planted. The Jet Black, Light Blue Candy, and Steel Silver color options give it a youthful, customizable appeal, though the matte-black variant feels particularly menacing.

The Nitro’s standout feature is its 13-inch wheels—uncommon in the 50 cc class, where 10-inch rims dominate. Wrapped in 130/60 front and 140/60 rear tires, these wheels add stability at higher speeds and inspire confidence on uneven roads. The hydraulic telescopic front fork (80 mm / 3.1 inches of travel) and rear hydraulic swingarm (60 mm / 2.4 inches) handle potholes with surprising composure, though rough surfaces still send judders through the chassis.

At 92 kg (202.8 lbs) dry weight, the Nitro feels light enough for beginners to maneuver but substantial enough to avoid feeling flimsy. The narrow 690–720 mm (27.2–28.3 inches) width makes filtering through tight spaces a breeze, while the 7.3-inch (185 mm) ground clearance avoids scrapes on curbs.

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Engine & Performance: Two-Stroke Thrills

The heart of the MBK 50 Nitro is its liquid-cooled, single-cylinder two-stroke engine—a rarity in an era where four-strokes dominate for emissions compliance. With 2.7 HP (2.0 kW) at 6,500 RPM and 3.7 Nm (2.7 ft.lbs) of torque at 4,500 RPM, it’s no speed demon, but the engine’s character is electric. The automatic centrifugal clutch and belt-driven transmission deliver seamless acceleration, propelling the Nitro to its governed top speed of ~45 km/h (28 mph) with a satisfying rasp from the exhaust.

The liquid cooling system is a game-changer here. Unlike air-cooled rivals that suffer from heat soak in stop-and-go traffic, the Nitro’s engine stays consistent, even during prolonged rides. The Gurtner PY-12 carburetor ensures crisp throttle response, though cold starts occasionally require patience—or a kickstarter backup.

Fuel efficiency is decent for a two-stroke, averaging around 30–35 km/l (70–82 mpg), thanks to the 7-liter (1.85 US gal) tank. But let’s be honest: the joy of this engine isn’t in frugality. It’s in the way it zips to life, howling through the revs with a rawness that four-strokes can’t replicate.

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Handling & Ride Experience: Urban Playground

Riding the Nitro feels like piloting a go-kart with a license plate. The 1,256 mm (49.4-inch) wheelbase and neutral steering geometry make it flickable yet stable. On tight corners, the grippy 13-inch tires and low center of gravity allow for cheeky lean angles, though the short suspension travel demands caution over bumps.

The 190 mm front and rear disc brakes are a revelation in this class. Many competitors still use drum brakes, but the Nitro’s hydraulic discs offer strong, progressive stopping power. In rainy conditions, they bite confidently, and aftermarket sintered pads (available at MOTOPARTS.store) can enhance performance further.

For taller riders, the ergonomics might feel cramped—the flat seat and narrow floorboard leave little room to stretch. But for its target audience (teens and urban commuters), the Nitro’s compact layout is a perfect fit.

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Competition: How Does the Nitro Stack Up?

The 50 cc scooter market is fiercely competitive. Here’s how the Nitro compares to its rivals:

1. Aprilia SR50 (2000s):
2. Pros: Faster liquid-cooled DiTech engine, sharper styling.
3. Cons: Complex fuel injection systems prone to issues; higher maintenance costs.

4. Verdict: The SR50 is sportier but less reliable. The Nitro wins for simplicity.

5. Peugeot Speedfight 2 (1997–2012):

6. Pros: Lively two-stroke engine, iconic design.
7. Cons: Air-cooled engine overheats in traffic; weaker drum brakes.

8. Verdict: The Nitro’s liquid cooling and discs make it a better daily rider.

9. Yamaha Aerox 50 (2000s):

10. Pros: Yamaha reliability, spacious under-seat storage.
11. Cons: Heavier (104 kg / 229 lbs), softer suspension.
12. Verdict: The Aerox is more practical, but the Nitro is livelier.

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Maintenance: Keeping the Nitro Alive

The MBK 50 Nitro’s two-stroke engine demands attention, but it’s mechanically simple—perfect for DIY enthusiasts. Key tips:

1. Oil & Lubrication:
2. Use high-quality two-stroke oil (separate lubrication system) to prevent piston seizures.

3. Change gearbox oil (110 ml of 10W-30) every 3,000 km (1,864 miles).

4. Cooling System:

5. Flush coolant annually and inspect hoses for leaks. The liquid-cooled design avoids overheating but adds complexity.

6. Carburetor Tuning:

7. The Gurtner PY-12 carb is reliable but sensitive to dirt. Clean jets every 5,000 km and adjust the air screw (1.25 turns out) for optimal idle.

8. Spark Plugs:

9. NGK BR8HS or iridium BR8HIX plugs (gap 0.6 mm) ensure smooth cold starts.

10. Brakes:

11. Replace DOT 4 fluid every two years. Upgrade to braided steel lines for firmer lever feel.

MOTOPARTS.store Recommendations:
- Performance exhausts to unlock extra two-stroke growl.
- Upgraded brake pads for track-day-level stopping.
- Weatherproof storage bags for urban errands.

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Conclusion: A Cult Classic for the Streets

The MBK 50 Nitro isn’t just a scooter—it’s a statement. Its liquid-cooled engine, disc brakes, and aggressive stance make it a cut above utilitarian 50 cc rivals. While modern emissions laws have sidelined two-strokes, the Nitro remains a beloved relic for those who value character over conformity. Whether you’re restoring a 1997 model or hot-rodding a 2012 version, MOTOPARTS.store has the gear to keep your Nitro alive and snarling.

Ride hard, maintain harder.

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Specifications sheet

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