Suzuki GSX-S 125 (2017-2022): A Compact Powerhouse for Urban Warriors

When Suzuki introduced the GSX-S 125 in 2017, it brought a refreshing dose of sporty DNA to the 125cc naked bike segment. Designed as an entry point for new riders and a practical commuter for urban environments, this lightweight machine has maintained its relevance through smart engineering updates and a focus on rider-friendly ergonomics. After spending time with this motorcycle across various model years, here's why it continues to be a compelling choice in its category.

Design Philosophy: Sporty Minimalism

The GSX-S 125 immediately catches attention with its aggressive streetfighter styling – a scaled-down version of its larger GSX-S siblings. The 2017-2022 generation features: - A sharp twin-headlamp design (LED units from 2018 onward) - Muscular fuel tank styling with knee indents - Minimalist tail section with LED taillight - 785mm (31") seat height accessible for most riders - Color options ranging from Titan Black to Metallic Triton Blue

What surprised me most was the quality of finish. The matte paint options resist scratches better than expected, while the switchgear feels premium compared to some competitors. The digital dashboard (introduced in later models) provides crisp visibility even in direct sunlight, showing gear position, fuel economy, and a shift light – crucial for maximizing performance from this high-revving engine.

Engine and Performance: Small Bore, Big Ambitions

At the heart beats a 124.4cc liquid-cooled DOHC single-cylinder engine producing: - 14.8 HP (11 kW) @ 10,000 RPM - 11.5 Nm (8.5 lb-ft) @ 8,000 RPM - 6-speed transmission with slip-assist clutch (post-2018 models)

The fuel-injected powerplant requires enthusiastic revving to stay in its sweet spot, delivering 0-60 km/h (37 mph) in 5.8 seconds. While highway cruising at 100 km/h (62 mph) is possible, the engine feels most alive in city riding between 40-80 km/h (25-50 mph). Fuel economy is exceptional at 1.92 L/100km (122.5 mpg), translating to over 500km (310 miles) range from the 11L tank.

During my test ride, the liquid cooling system proved its worth, maintaining stable temperatures even during extended stop-and-go traffic. The distinctive exhaust note – deeper than typical 125cc singles – adds character without being obnoxious.

Handling and Dynamics: Surprising Maturity

Suzuki's chassis engineers worked magic with the GSX-S 125's 1,300mm (51.2") wheelbase: - 31mm telescopic forks with 120mm travel - Link-type rear suspension with 7-step preload adjustment - 17" wheels wearing 90/80 front and 130/70 rear tires - Wet weight of 134kg (295 lbs) including fluids

The riding position strikes a perfect balance between sporty and comfortable. Handlebar vibrations are minimal up to 8,000 RPM, making hour-long commutes fatigue-free. At low speeds, the 165mm (6.5") ground clearance allows confident lean angles, though the pegs will touch down earlier than middleweight nakeds.

Braking performance improved significantly with the 2018 ABS update: - 290mm front petal disc with 2-piston caliper - 187mm rear disc - Dual-channel ABS (select models) with minimal intrusion

Competition: Standing Out in the 125cc Arena

When compared to rivals, the GSX-S 125 holds its ground through unique advantages:

1. Yamaha MT-125
2. More powerful (15 HP) but heavier (140kg/309lbs)
3. Aggressive styling appeals to younger riders

4. Higher maintenance costs for chain/sprocket components

5. Honda CB125R

6. Premium Neo-Sports Café design
7. Showa suspension offers better damping

8. 30% more expensive in aftermarket parts

9. KTM 125 Duke

10. Sharper handling but harsher ride quality
11. Single-channel ABS only
12. Higher insurance premiums

The Suzuki's ace card is balanced performance – it doesn't lead in any single category but delivers the most complete package for daily use. The 14/45 sprocket combination provides better low-end response than Yamaha's 15/44 setup, while the chain lasts longer than KTM's 520-series unit.

Maintenance: Keeping Your GSX-S 125 in Peak Condition

As MOTOPARTS.store journalists, we recommend these key maintenance aspects:

1. Oil Changes
- Use JASO MA2-certified 10W-40 oil - 1.3L (1.37 qt) without filter change - 1.4L (1.48 qt) with filter replacement - Change interval: Every 6,000km (3,728 miles)

2. Valve Adjustments
- Check every 12,000km (7,456 miles) - Intake: 0.1-0.2mm (0.004-0.008") - Exhaust: 0.2-0.3mm (0.008-0.012") - Requires specialty shim kit (Suzuki PN 09448-33311)

3. Chain Maintenance
- 122-link DID520VX2 chain - Tension: 25-35mm (1-1.4") free play - Clean every 500km (310 miles) with kerosene-based cleaner

4. Brake System
- DOT4 fluid change every 2 years - Pad replacement indicator at 3mm (0.12") - ABS models require dealer-level diagnostics

5. Cooling System
- 1.25L (1.32 qt) capacity - Replace coolant every 24,000km (14,913 miles) - Use ethylene glycol mix (50/50 with distilled water)

For performance upgrades consider: - NGK Iridium IX spark plugs (CR9EIX) - Adjustable levers for better ergonomics - Upgraded sintered brake pads - LED turn signals (plug-and-play kits available)

Long-Term Ownership Experience

Owners report these common wear items: - Clutch cable stretching at 15,000km (9,320 miles) - Fork seal deterioration in dusty conditions - Throttle body needing cleaning every 10,000km (6,214 miles) - Rear shock losing damping after 20,000km (12,427 miles)

The modular design makes parts replacement straightforward. For example, swapping the 14T front sprocket takes under 30 minutes with basic tools. Those wanting to personalize their GSX-S 125 can choose from: - Gel comfort seats - Frame sliders - Quick-shifter kits (for 2019+ models) - Bar-end mirrors

Conclusion: The Smart Choice in 125cc

The Suzuki GSX-S 125 successfully bridges the gap between learner restrictions and genuine motorcycle enjoyment. While not without compromises – the high-revving nature demands frequent gear changes – it rewards skilled riders with surprising agility. The 2018 ABS update addressed its only significant safety concern, cementing its position as one of the most complete A1-license machines.

For urban commuters and weekend canyon carvers alike, this Suzuki proves that small displacement doesn't mean small excitement. With proper maintenance using quality parts from MOTOPARTS.store, these motorcycles regularly surpass 50,000km (31,068 miles) with minimal issues – a testament to their robust engineering.

---

Specifications sheet

---