Suzuki GSX-S 125 (Euro 5) (2025) — Specs
Identity
Manufacturer: Suzuki
Model: GSX-S 125 (Euro 5)
Category: Motorcycle
Type: Motorcycle
Years: 2025 →
Engine
Displacement (cc): 124
Cylinders: 1
Power (hp): 15
Power (kW): 11
Torque (Nm): 11.5
Dimensions
Overall length: 1950 mm
Overall width: 720 mm
Overall height: 1110 mm
Wheelbase: 1340 mm
Ground clearance: 150 mm
Weight (kg): 135
Seat height (mm): 785
Tank (L): 11
Tires
Front tire: 90/80-17
Rear tire: 130/70-17
Drivetrain
Drive chain: 420 chain
Sprockets (front / rear): 14 / 45
Ignition
Spark plug: NGK MR8E-9
Plug gap: 0.9 mm
Fluids & Filters
Engine oil: SAE10W-40, API SG
Engine oil (with filter, L): 1.4
Engine oil (without filter, L): 1.3
Oil filter: Hiflofiltro HF131
Air filter: Hiflofiltro HFA3105
Coolant (L): 1
Brake fluid: DOT 4
Fuel consumption
Manufacturer / WMTC: 2.5 L/100 km
Real-world range: ~440 km on a full tank (11.0 L)
Note: real-world ±15-30% depending on riding style
Service
Battery: OEM battery specification
Service interval (km): 6000
Service interval (months): 12
Valve check (km): 12000
Parts and consumables for this motorcycle
Data is gathered with care, but without guarantee. Always confirm critical information with your dealer or workshop.
Service notes
Service interval: every 6,000 km or 12 months, whichever comes first. Valve clearance check every 12,000 km. Engine oil: oil grade SAE10W-40, API SG, 1.4 L with filter change, 1.3 L without filter change. Spark plug: NGK MR8E-9. Brake fluid: DOT 4. Coolant capacity: 1 L. Chain: chain drive, sprockets 14/45 teeth. Tire size: front 90/80-17, rear 130/70-17. Always confirm critical values with the workshop manual or an authorised dealer.
OEM and quality aftermarket parts that fit this bike. Always confirm with your dealer before ordering.
Engine oil
Spec: SAE 10W-40, 1.0 L (with filter)
- OEM OEM recommended engine oil (SAE 10W-40)
- Premium Motul 7100 4T (100% Synthetic, Ester)
- Premium Motul 5100 4T Technosynthese (Semi-Synthetic)
Which Motul for this bike?
| Motul 7100 4T ✓ | Motul 5100 4T | |
|---|---|---|
| Product | Motul 7100 4T — 100% fully synthetic | Motul 5100 4T — semi-synthetic |
| Best for | Sport, Naked, Adventure (600cc+), track | Standard, Cruiser, Scooter, daily use |
| RPM protection | Excellent — ester base, stable under load | Good — for normal riding conditions |
- Standard Repsol Moto Racing 4T (Synthetic)
- Standard Elf Moto 4 Tech (Semi-Synthetic)
Fully Synthetic vs Semi-Synthetic
| Fully Synthetic | Semi-Synthetic | |
|---|---|---|
| Base oil | 100% chemical synthesis (ester or PAO) | Mineral oil + synthetic additives |
| Heat resistance | Excellent — stable at extreme heat & RPM | Good — suitable for normal temperatures |
| Cold start | Better — reaches engine faster when cold | Good — adequate for normal climates |
| Change interval | Longer (up to 10,000 km) | Shorter (5,000–7,000 km typical) |
| Price | Higher | Lower |
Oil filter
Spec: Hiflofiltro HF131
- Premium Hiflofiltro HF131
- Premium K&N KN-131
Air filter
Spec: Hiflofiltro HFA3105
- Standard Hiflofiltro HFA3105
Spark plug
Spec: NGK CR8E, gap 0.7-0.8 mm
- OEM NGK CR8E
- Premium NGK CR8EIX
- Standard NGK CR8E
Front brake pads
Spec: EBC SFA260HH
- Premium EBC SFA260HH
Rear brake pads
Spec: EBC SFA260HH
- Premium EBC SFA260HH
Drive chain
Spec: chain drive | Sprockets 14/45 teeth
Front tire
Spec: 90/80-17
- OEM OEM 90/80-17
Rear tire
Spec: 130/70-17
- OEM OEM 130/70-17
Battery
- OEM OEM battery: Yuasa YTX5L-BS
- Premium Yuasa YTX5L-BS
Brake fluid
Spec: DOT 4
- Standard TotalEnergies HBF4
Coolant
Spec: 1.00 L coolant capacity
Service interval
Spec: 6 000 km / 12 months
- OEM Engine oil + oil filter change
- OEM Air filter inspection
- OEM Spark plug check
- OEM Brake fluid replacement: every 2 years
Valve check
Spec: 12 000 km
Suspension
Spec: 31 mm telescopic fork
- OEM Fork: 31 mm telescopic fork
