Suzuki GSX-8S (EM1AA 270° Twin) — OEM Fluid, Tire Pressure & Maintenance Specs
776cc Liquid-Cooled Parallel-Twin 270° Crank + Cross Balancer (Bi-Directional QS + Wet SCAS) · Source: Suzuki GSX-8S (EM1AA / WEM0) Official Owner’s Manual Maintenance Specifications
According to the Suzuki GSX-8S (EM1AA / WEM0) Official Owner’s Manual Maintenance Specifications, the 2023–Present Suzuki GSX-8S (EM1AA 270° Twin) (chassis EM1AA/WEM0) requires 3 L (3.17 US qt) of SAE 10W-40 (JASO MA2, API SJ/SL/SM/SN) engine oil for a drain-only change and 3.5 L (3.70 US qt) with filter service (16510-07J00 / HF138 (M20x1.0 Suzuki Thread)). Standard solo cold tire pressure is 250 kPa / 2.50 bar / 36 PSI front (120/70ZR17 M/C (58W)) and 250 kPa / 2.50 bar / 36 PSI rear (180/55ZR17 M/C (73W)), paired with 2× NGK LMAR8BI-9 spark plug(s) and a FTZ10S / YTZ10S battery.
Drain only: 3 L (3.17 US qt)
R 250 kPa (2.50 bar)
Est. Range: ~333 km (207 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Multi-Plate Manual Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-40 (Alt: SAE 10W-50) · JASO MA2 · API SJ/SL/SM/SN |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 3 L (3.17 US qt) • With filter/strainer: 3.5 L (3.70 US qt) • Complete dry overhaul: 3.9 L (4.12 US qt) |
| OEM Oil Filter Code & Type | 16510-07J00 / HF138 (M20x1.0 Suzuki Thread) |
| 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 | 23 N·m (17.0 lb-ft / 2.35 kgf·m) — Use fresh crush washer |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 120/70ZR17 M/C (58W) · Rear: 180/55ZR17 M/C (73W) (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 250 kPa / 2.50 bar / 36 PSI Rear: 250 kPa / 2.50 bar / 36 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 250 kPa / 2.50 bar / 36 PSI Rear: 250 kPa / 2.50 bar / 36 PSI |
| OEM Spark Plug & Quantity | NGK LMAR8BI-9 × 2 (Gap: 0.8–0.9 mm (Laser Iridium)) |
| OEM Battery Code & Rating | FTZ10S / YTZ10S (12V 8.6Ah MF AGM) |
| Final Drive Maintenance | 525 Sealed O-Ring Chain (118 links, 17T/47T) — Maintain 20–30 mm slack |
| Brake Fluid & Coolant | DOT 4 · Suzuki Super Long Life Blue Coolant (~1.87 L) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 776 cc · 82.9 hp @ 8,500 rpm · 78 N·m (57.5 lb-ft) @ 6,800 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 810 mm (31.9 in) · 202 kg (445 lbs) |
| Fuel Tank & Est. Real-World Range | 14 L (3.7 US gal) · ~23.8 km/L → ~333 km (207 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 6,000 km / 18,000 km • Air Filter / Spark Plug: 18,000 km / 12,000 km • Valve Clearance Check: 24,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Debuting in 2023 as Suzuki’s clean-sheet streetfighter, the 202 kg GSX-8S pairs tapered aluminum handlebars and KYB suspension (distinct from the 205 kg Showa-forked GSX-8R) with a 3.5 L roadster oil pan (distinct from the V-Strom 800DE’s deeper 3.9 L pan).
Oil & Clutch Mechanical Engineering Note
Dual 90-degree Cross Balancer shafts, Suzuki Clutch Assist System (SCAS), and the standard bi-directional quickshifter rely on clean SAE 10W-40 JASO MA2 oil—fill 3.0 L drain-only or 3.5 L with a Suzuki M20×1.0 pitch filter (16510-07J00 / HF138).
Garage Wrenching Gotchas
- Clever packaging places the airbox directly underneath the rider saddle rather than under the fuel tank—you can inspect or swap the air filter in minutes without touching a fuel line!
- Factory cold pressure on the GSX-8S is an equal 250 kPa (36 PSI) front AND 250 kPa (36 PSI) rear solo or two-up—do not overinflate the 180/55ZR17 rear to 42 PSI.
5. Frequently Asked Questions (FAQ)
How many 1-liter oil bottles do I need for a Suzuki GSX-8S filter change?
While an oil-only drain takes 3.0 L, replacing the 16510-07J00 / HF138 filter requires 3.5 L (3.7 US qt)—so pick up four 1-liter bottles.
Why will Honda or Yamaha spin-on filters ruin a Suzuki GSX-8S oil boss?
Suzuki uses a fine M20×1.0 thread pitch on 16510-07J00 / HF138 filters, whereas Honda/Yamaha/Kawasaki use coarse M20×1.5 threads—cross-threading causes dangerous oil blowouts.
How does the GSX-8S compare on the road to the Yamaha MT-07?
With 776cc displacement (82.9 hp), a cast-aluminum swingarm, standard up/down quickshifter, and 3-mode traction control, the GSX-8S feels noticeably more planted in fast sweepers.