Suzuki GSX-S125 — OEM Fluid, Tire Pressure & Maintenance Specs
124.4cc Liquid-Cooled Single DOHC 4-Valve (Shutter Key Lock · 133 kg Naked) · Source: Suzuki GSX-S125 (2017–Present) Official Owner’s Manual Maintenance Specifications
According to the Suzuki GSX-S125 (2017–Present) Official Owner’s Manual Maintenance Specifications, the 2017–Present Suzuki GSX-S125 (chassis DL32B/WDL0) requires 1.3 L (1.37 US qt) of SAE 10W-40 (JASO MA2, API SJ/SL/SM) engine oil for a drain-only change and 1.4 L (1.48 US qt) with filter service (16510-45H10 / HF131). Standard solo cold tire pressure is 175 kPa / 1.75 bar / 25 PSI front (90/80-17 M/C 46S) and 200 kPa / 2.00 bar / 29 PSI rear (130/70-17 M/C 62S), paired with 1× NGK MR8E-9 spark plug(s) and a YTX7L-BS / YTX9-BS battery.
Drain only: 1.3 L (1.37 US qt)
R 200 kPa (2.00 bar)
Est. Range: ~457 km (284 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Multi-Plate Manual Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-40 · JASO MA2 · API SJ/SL/SM |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 1.3 L (1.37 US qt) • With filter/strainer: 1.4 L (1.48 US qt) • Complete dry overhaul: 1.5 L (1.59 US qt) |
| OEM Oil Filter Code & Type | 16510-45H10 / HF131 |
| Correct Oil Level Check Method | Hold bike upright on level ground 3–5 min after warm shutdown; read crankcase sight glass |
| Oil Drain Bolt Torque | 21 N·m (15.5 lb-ft / 2.14 kgf·m) — Use fresh crush washer |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 90/80-17 M/C 46S · Rear: 130/70-17 M/C 62S (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 175 kPa / 1.75 bar / 25 PSI Rear: 200 kPa / 2.00 bar / 29 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 175 kPa / 1.75 bar / 25 PSI Rear: 225 kPa / 2.25 bar / 33 PSI |
| OEM Spark Plug & Quantity | NGK MR8E-9 × 1 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTX7L-BS / YTX9-BS (12V 6.0–8.0Ah MF AGM) |
| Final Drive Maintenance | 428 Sealed O-Ring Chain (14T/45T) — Maintain 20–30 mm slack |
| Brake Fluid & Coolant | DOT 4 · Silicate-free ethylene-glycol OAT coolant for aluminum radiators (50:50 premix) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 124 cc · 15 hp @ 10,000 rpm · 11.5 N·m (8.5 lb-ft) @ 8,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 785 mm (30.9 in) · 133 kg (293 lbs) |
| Fuel Tank & Est. Real-World Range | 11 L (2.9 US gal) · ~41.5 km/L → ~457 km (284 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 5,000 km / 10,000 km • Air Filter / Spark Plug: 12,000 km / 10,000 km • Valve Clearance Check: 12,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Released alongside the GSX-R125 in 2017 (DL32B), substituting a tubular handlebar, streetfighter shroud, and mechanical magnetic-shutter ignition lock for 133 kg urban agility.
Oil & Clutch Mechanical Engineering Note
Unfaired engine access makes changing internal paper filter HF131 and filling 1.4 L of SAE 10W-40 JASO MA2 fast; overfilling past the upper sight-glass line makes neutral hard to find.
Garage Wrenching Gotchas
- Lubricate the one-push security key shutter only with dry lock lube rather than sticky grease, preventing winter icing or bent keys.
- Check 428 drive chain slack right at the 1,000 km break-in service, as light-duty OEM chains bed in noticeably during initial commuting.
5. Frequently Asked Questions (FAQ)
What oil volume, JASO grade, and oil filter code does the Suzuki GSX-S125 (2017–Present) require?
Because its wet multi-plate clutch shares engine oil with the gearbox, run SAE 10W-40 (JASO MA2) at 1.3 L (1.37 US qt) drain-only and 1.4 L (1.48 US qt) with filter (16510-45H10 / HF131).
How do you accurately check the oil level on the GSX-S125, and what are its service intervals?
Hold the motorcycle dead-vertical on level ground 2–3 minutes after warm shutdown and verify the oil sits mid-way between the Upper and Lower marks in the crankcase sight glass—never on the sidestand. Torque the drain plug to 21 N·m with a new crush washer. Factory oil change intervals are every 5,000 km, with valve clearance inspection every 12,000 km.
What are the cold tire pressures, puncture repair type, seat height, and range of the GSX-S125?
Fitted with 90/80-17 M/C 46S front and 130/70-17 M/C 62S rear tubeless rims (compatible with roadside plug kits), set cold tire pressures to 25 / 29 PSI (175/200 kPa) solo or 25 / 33 PSI loaded. Seat height is 785 mm (30.9 in) at 133 kg wet weight, delivering ~457 km per 11 L tank.