SYM SYMPHONY 125 (2015-2021) Review: A Symphony of Practical Urban Mobility

Introduction

The SYM SYMPHONY 125 represents a harmonious blend of practicality and reliability in the 125cc scooter segment. Produced from 2015 to 2021, this Taiwanese-made workhorse caters to urban commuters seeking a no-nonsense, fuel-efficient ride. With its air-cooled engine, lightweight chassis, and fuss-free maintenance, the Symphony has carved a niche among riders who value simplicity and cost-effectiveness. Let’s dissect what makes this scooter a compelling choice for city dwellers.

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Design and Styling

The SYMPHONY 125 adopts a classic underbone scooter silhouette with subtle modern touches. Its clean lines, rounded headlight cluster, and streamlined bodywork give it a timeless appeal that avoids looking dated even in 2024. The 2019 refresh introduced sharper color options like metallic grey and deep blue, while earlier models leaned on conservative black/white schemes.

With a 78.7-inch (2000 mm) length and 27.2-inch (690 mm) width, it strikes a perfect balance between maneuverability and presence. The flat floorboard offers generous legroom, and the 44.3-inch (1125 mm) height ensures most riders enjoy an upright, comfortable posture. Storage is adequate with under-seat capacity for a full-face helmet and small groceries—a crucial detail for daily errands.

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Engine and Performance

The Heart of the Matter

At its core lies a 124.6cc single-cylinder, four-stroke engine (later models upgraded to fuel injection). Outputting 9.8 HP @ 8,500 RPM and 8.6 Nm torque @ 6,500 RPM, it’s tuned for smooth acceleration rather than outright speed. The CVT transmission delivers seamless power delivery—ideal for stop-and-go traffic.

Test Ride Impressions:
Twist the throttle, and the Symphony responds with polite urgency. 0-50 km/h (0-31 mph) arrives in a relaxed 6-7 seconds, with vibrations kept surprisingly in check thanks to SYM’s engine balancing. Top speed hovers around 90 km/h (56 mph), making it competent for city arterials but hesitant on highways. Fuel efficiency shines at 29.8 km/l (70 mpg), translating to 160+ km (100+ miles) from its 5.5-liter (1.45-gallon) tank.

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Handling and Comfort

The Symphony’s 116-127 kg (255-280 lb) dry weight makes it flickable through traffic. The telescopic front fork and rear unit swing suspension handle urban imperfections with composure, though larger potholes send noticeable jolts through the chassis.

Wheelbase varies slightly between models (52.4-53.1 inches / 1330-1350 mm), contributing to stable cornering. The 16-inch wheels—uncommon in this segment—add stability at speed, while the 110/70 tires offer decent grip. Braking is handled by single discs front/rear with predictable bite, though ABS is conspicuously absent even on later models.

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Technology and Features

This isn’t a tech-laden scooter, but SYM nailed the essentials:
- Lighting: 35W halogen headlights (adequate for city use)
- Instrumentation: Analog speedometer with basic LCD tripmeter
- Convenience: Electric start, magnetic ignition lock, and optional top box mounts
- Euro 4 Compliance (2019+ models) ensures cleaner emissions

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Competition

How does the Symphony stack up against rivals?

| Model | Pros | Cons |
|--------------------|---------------------------------------|---------------------------------------|
| Honda SH125 | Superior brand cachet, liquid cooling | Higher maintenance costs |
| Yamaha NMAX 125| More powerful engine, ABS option | Pricier, bulkier design |
| Kymco Agility 125 | Cheaper price point | Rougher engine, dated styling |

The Symphony’s sweet spot lies in its mechanical simplicity and low running costs. While it lacks the Honda’s refinement or Yamaha’s tech, it undercuts both in maintenance complexity—a key advantage for DIY enthusiasts.

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Maintenance

Here’s where the Symphony truly sings. Its straightforward mechanics make it a dream for owners who prefer self-servicing:

1. Engine Oil
2. Capacity: 750 ml with filter (10W-40 API SH)

3. Change interval: Every 3,000 km (1,864 miles)

4. Valve Adjustments

5. Intake/Exhaust: 0.12±0.02 mm (0.0047±0.0008 in) when cold

6. Check every 6,000 km (3,728 miles)

7. Tire Pressure

8. Front: 2.0 bar (29 psi)

9. Rear: 2.0-2.25 bar (29-33 psi)

10. Spark Plug

11. NGK CR7HSA gap: 0.6-0.7 mm (0.024-0.028 in)

12. Brake Fluid

13. DOT4 replacement every 2 years

Pro Tips from MOTOPARTS.store:
- Upgrade to a high-flow air filter for smoother throttle response
- Use ceramic brake pads to reduce fade during heavy use
- Consider a CVT tuning kit to optimize acceleration

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Conclusion

The SYM SYMPHONY 125 won’t set your pulse racing, but it delivers where it counts: reliable transportation with rock-bottom upkeep. Its air-cooled engine might seem antiquated next to liquid-cooled rivals, but that simplicity translates to longevity. For urban riders prioritizing function over frills, this Taiwanese scooter remains a movement of mechanical pragmatism worth applauding.

Whether you’re maintaining a 2015 carbureted model or a 2021 fuel-injected variant, MOTOPARTS.store carries all essentials—from NGK spark plugs to SYM-specific oil filters—to keep your Symphony performing encores for years to come.

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Specifications sheet

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