Yamaha TW 125 (1999–2004) Review: The Unassuming Trail Companion

Introduction

The Yamaha TW 125, produced from 1999 to 2004, is a motorcycle that defies expectations. Marketed as a lightweight dual-sport machine, it bridges the gap between urban commuting and weekend trail adventures with surprising competence. While its 124cc engine won’t set speed records, the TW 125 has carved out a loyal following for its simplicity, approachable design, and go-anywhere attitude. After spending time with a well-preserved 2003 model, it’s clear why this bike remains a favorite for beginners and seasoned riders seeking a stress-free two-wheeled companion.

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Design & Ergonomics

The TW 125’s design is a masterclass in functional minimalism. Its high-mounted fenders, long-travel suspension, and upright riding position scream “adventure,” but scaled down to a manageable size. The 805 mm (31.7-inch) seat height is forgiving for shorter riders, while the narrow chassis allows even taller riders to plant their feet firmly at stops.

The cockpit is refreshingly analog—no digital dash here, just a simple speedometer and indicator lights. Switchgear feels durable, if not premium, and the overall layout prioritizes usability over flair. Color options like Extreme Yellow and Silver Ice add a touch of personality, though years of sun exposure can fade these hues if not protected.

At 106–118 kg (234–260 lbs) depending on model year, the TW 125 feels almost bicycle-light when maneuvering through traffic or picking it up after a trail mishap. The 7-liter (1.9-gallon) fuel tank seems small but pairs well with the engine’s frugal appetite, offering a 200–250 km (124–155 mi) range between fill-ups.

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Performance: Small Bore, Big Heart

Don’t let the 124cc air-cooled single-cylinder engine fool you—this is a motor built for versatility, not velocity. With 11.8–12 HP peaking at 9,000 RPM and 9.7 Nm (7.2 lb-ft) of torque arriving at 8,000 RPM, acceleration is leisurely but predictable. The 5-speed transmission shifts with a satisfying mechanical click, though finding neutral can be finicky when the engine is hot.

On-Road Behavior:
- 0–60 km/h (0–37 mph): Adequate for city traffic, reaching ~6 seconds.
- Top Speed: ~102 km/h (63 mph) with a tailwind, though 80–90 km/h (50–56 mph) is more comfortable.
- Vibration: Noticeable above 70 km/h (43 mph), typical for singles of this era.

Off-Road Capability:
The TW 125 truly shines on dirt. The 160 mm (6.3-inch) front and 150 mm (5.9-inch) rear suspension travel absorb ruts and rocks better than bikes twice its price. Combined with chunky 130/80-16 front and 180/80-14 rear tires, it maintains composure on loose surfaces. Steep hill climbs require momentum management due to the modest powerband, but the light weight makes recovery from mistakes effortless.

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Handling & Ride Quality

Yamaha nailed the geometry here. The 1,280–1,350 mm (50.4–53.1-inch) wheelbase strikes a balance between stability and agility. On paved twisties, the TW 125 leans willingly, though the budget-oriented tires demand caution in wet conditions. Off-road, the narrow profile lets you thread through tight trails that would intimidate bulkier enduros.

Suspension Notes:
- Front Telescopic Forks: Stiff enough for casual jumps but lack adjustability.
- Rear Monoshock: Preload settings help accommodate luggage or a passenger.

Braking is adequate, not stellar. The 220mm front disc provides decent bite, but the 130mm rear drum requires a firm stomp. Riders upgrading to sintered pads (available at MOTOPARTS.store) report improved stopping power.

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Competition

In the 125cc dual-sport segment, the TW 125 faced rivals like:

1. Honda XL125 Varadero
2. Pros: Sleeker design, slightly better road manners.

3. Cons: Heavier (123 kg/271 lbs), less suspension travel.

4. Suzuki DR125S

5. Pros: 6-speed gearbox, liquid cooling.

6. Cons: Higher maintenance complexity, fewer color options.

7. Kawasaki KMX125

8. Pros: 2-stroke engine for sharper acceleration.
9. Cons: Higher emissions, less fuel-efficient.

Why the TW 125 Stands Out:
- Lower seat height than competitors.
- Air-cooled reliability with minimal upkeep.
- Aftermarket support for customization (e.g., MOTOPARTS.store’s TW 125 catalog).

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Maintenance: Keeping It Simple

The TW 125’s maintenance schedule is a DIY enthusiast’s dream:

1. Oil Changes: Every 3,000 km (1,864 mi) using 1.1L of SAE 10W-40. Always replace the strainer filter (part #TW-125-OF1).
2. Valve Adjustments: Check every 6,000 km (3,728 mi). Clearances:
3. Intake: 0.05–0.09 mm (0.002–0.004 in)
4. Exhaust: 0.11–0.15 mm (0.004–0.006 in)
5. Chain Care: 109-link chain requires regular lubrication. Upgrade to an O-ring chain for longer life.
6. Carburetor Tuning: The TEIKEI Y24P carb benefits from annual cleaning. Set idle speed to 1,400 ± 100 RPM.
7. Tire Pressure:
8. Street: 1.5 bar (22 psi) front/rear
9. Off-Road: 1.2 bar (17 psi) front, 1.4 bar (20 psi) rear

Common Upgrades:
- High-flow air filters (improves throttle response).
- LED lighting kits (better visibility).
- Progressive-rate suspension springs (enhances rough terrain control).

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Conclusion

The Yamaha TW 125 isn’t about chasing specs—it’s about rediscovering the joy of unfiltered riding. Whether you’re navigating city traffic, exploring fire roads, or teaching a friend to ride, this bike delivers grin-inducing practicality. While newer models offer more tech, the TW 125’s charm lies in its mechanical honesty and rugged durability.

For owners looking to refresh their TW 125, MOTOPARTS.store offers everything from OEM-spec replacement parts to performance upgrades. Because even the most reliable machines deserve a little love—and your next adventure is always just a wrench turn away.

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Specifications sheet

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