KYMCO MXU 50 (2004-2017) Review: A Trusty Steed for Entry-Level Off-Road Adventures
Introduction
The KYMCO MXU 50 is a pint-sized powerhouse that’s been a staple in the youth and entry-level ATV market since its debut in 2004. Designed for riders who crave accessibility without sacrificing durability, this Taiwanese-built quad has carved out a niche as a reliable companion for light trail riding, farm work, or simply tearing up the backyard. While it won’t win drag races against larger machines, the MXU 50 excels in delivering a fuss-free, mechanically honest experience that prioritizes simplicity over flashiness. Let’s dive into what makes this 50cc workhorse tick—and why it’s still relevant for new riders today.
Engine Performance: Two-Stroke Simplicity at Its Best
At the heart of the MXU 50 lies a 49cc single-cylinder two-stroke engine producing 4.5 HP at 6,000 RPM. While these numbers seem modest, the two-stroke design ensures a lively power delivery that’s perfect for lightweight off-roading. Throttle response is snappy, with a satisfying brap from the carburetted engine as it climbs through its rev range. You’ll notice a distinct powerband “hit” around 4,500 RPM—a classic two-stroke trait that makes even short trail bursts feel exhilarating.
The air-cooled mill stays remarkably composed during extended rides, though it does demand respect for its old-school quirks. Mixing two-stroke oil with gasoline becomes second nature, and the carburettor (a 13mm Keihin unit in later models) requires occasional tuning—especially if the ATV sits unused for weeks. Cold starts are a breeze thanks to the dual electric and kickstart options, a thoughtful touch for younger riders learning the ropes.
Power-to-weight ratio: At 100 kg (220.5 lbs), the MXU 50’s 0.045 HP/kg ratio won’t intimidate beginners. It’s just enough to tackle moderate inclines and mud pits without overwhelming novices. Top speed hovers around 40-45 km/h (25-28 mph), which feels brisk given the ATV’s compact dimensions.
Chassis and Handling: Nimble, Forgiving, and Surprisingly Capable
KYMCO nailed the geometry here. The SP pipe frame and 1,105 mm (43.5") wheelbase strike a balance between stability and maneuverability. On tight forest trails, the MXU 50 flicks through switchbacks with minimal body roll, while the 158 mm (6.2") ground clearance shrugs off rocks and roots.
Suspension setup:
- Front: Single A-Arm with 88 mm (3.5") of travel
- Rear: Unit swingarm with 89 mm (3.5") travel
The suspension is plush enough to absorb small bumps but firms up predictably during hard cornering. Younger riders will appreciate the lack of harsh bottoming-out, though aggressive adults might find the travel limits during high-speed jumps.
Braking system:
- Front: Drum brake (adequate for casual use)
- Rear: Single disc (surprisingly bitey)
While the drum front brake lacks initial bite, it pairs well with the rear disc for controlled stops. Upgrading to sintered brake pads (available at MOTOPARTS.store) dramatically improves performance in muddy conditions.
Design and Ergonomics: Built for Accessibility
The MXU 50’s 750 mm (29.5") seat height and narrow 958 mm (37.7") width make it approachable for riders as young as 12. The contoured seat offers just enough cushioning for hour-long rides, and the upright riding position keeps fatigue at bay.
Notable design features:
- 21/7-10 front and 22/10-10 rear tires: These chunky knobbies provide tenacious grip on loose terrain.
- 8.1L (2.14 US gal) fuel tank: Expect 80-100 km (50-62 miles) per tank, depending on throttle abuse.
- Red/black color scheme: Bold graphics hide scratches well—a godsend for first-time owners.
Competition: How the MXU 50 Stacks Up
1. Yamaha Raptor 50:
- Liquid-cooled four-stroke engine (smoother, but heavier)
- Auto-clutch transmission (easier for absolute beginners)
- Higher maintenance costs due to complex cooling system
2. Honda TRX90:
- 86cc four-stroke (more torque, less peaky powerband)
- Higher weight (113 kg / 249 lbs) reduces flickability
- Legendary Honda reliability, but pricier parts
3. Polaris Outlaw 50:
- Rear suspension linkage (better for aggressive riding)
- Requires premium fuel (unlike the MXU’s regular unleaded)
- Less aftermarket support compared to KYMCO
Verdict: The MXU 50 shines for riders valuing mechanical simplicity and low-cost upkeep. While rivals offer more refinement, KYMCO’s belt-drive system and air cooling mean fewer parts to fail—a boon for DIY enthusiasts.
Maintenance: Keeping Your MXU 50 Thriving
1. Engine Care:
- Oil Mixing: Use a 50:1 two-stroke oil ratio (JASO-FD certified). Pre-mix solutions from MOTOPARTS.store eliminate guesswork.
- Carb Cleaning: Clean the pilot jet every 30 hours to prevent ethanol-fuel clogs.
- Air Filter: Foam filters need oiling after deep mud rides. Consider a washable aftermarket filter.
2. Drivetrain:
- Belt Inspection: Check for cracks every 50 hours. Upgrade to a kevlar-reinforced belt for extended lifespan.
- Clutch Service: The wet multiplate clutch benefits from periodic oil changes (10W-40).
3. Suspension/Brakes:
- Drum Brake Tuning: Replace front brake shoes if lever travel exceeds ¾ inch.
- Grease Points: Lubricate A-Arm bushings annually to prevent squeaks.
Pro Tip: Store the MXU 50 with a fuel stabilizer to avoid carb issues. Our store carries ethanol-free additives perfect for seasonal storage.
Final Thoughts: Why the MXU 50 Endures
The KYMCO MXU 50 isn’t about cutting-edge tech or blistering speed—it’s about fostering confidence. Whether you’re teaching a teen their first powerslide or maintaining a fleet for ranch work, this quad’s bulletproof ethos resonates. The lack of fuel injection or liquid cooling might deter some, but for purists who enjoy tinkering, it’s a canvas for customization.
Upgrade Potential:
- Performance: Aftermarket exhausts wake up the engine’s midrange.
- Comfort: Wider footpegs reduce leg fatigue during long rides.
- Protection: Skid plates shield the frame during rock crawls.
Visit MOTOPARTS.store to explore upgrades that’ll keep your MXU 50 running—and grinning—for another decade.
