Kawasaki Ninja ZX-25R — OEM Fluid, Tire Pressure & Maintenance Specs
249.8cc Liquid-Cooled Inline-4 DOHC 16-Valve (17,000 rpm Redline · Showa SFF-BP) · Source: Kawasaki Ninja ZX-25R (2020–Present) Official Owner’s Manual Maintenance Specifications
According to the Kawasaki Ninja ZX-25R (2020–Present) Official Owner’s Manual Maintenance Specifications, the 2020–Present Kawasaki Ninja ZX-25R (chassis ZX250E/ZX250G/ZX250H) requires 2.5 L (2.64 US qt) of SAE 10W-40 (JASO MA2, API SG/SJ/SL) engine oil for a drain-only change and 2.9 L (3.06 US qt) with filter service (16097-0008 / HF303). Standard solo cold tire pressure is 200 kPa / 2.00 bar / 29 PSI front (110/70 R17 M/C 54H) and 225 kPa / 2.25 bar / 33 PSI rear (150/60 R17 M/C 66H), paired with 4× NGK LMAR9G spark plug(s) and a YTX9-BS / YTZ10S battery.
Drain only: 2.5 L (2.64 US qt)
R 225 kPa (2.25 bar)
Est. Range: ~284 km (176 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 SG/SJ/SL |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 2.5 L (2.64 US qt) • With filter/strainer: 2.9 L (3.06 US qt) • Complete dry overhaul: 3.1 L (3.28 US qt) |
| OEM Oil Filter Code & Type | 16097-0008 / HF303 |
| 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 | 29 N·m (21.4 lb-ft / 2.96 kgf·m) — Use fresh crush washer |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 110/70 R17 M/C 54H · Rear: 150/60 R17 M/C 66H (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 200 kPa / 2.00 bar / 29 PSI Rear: 225 kPa / 2.25 bar / 33 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 200 kPa / 2.00 bar / 29 PSI Rear: 225 kPa / 2.25 bar / 33 PSI |
| OEM Spark Plug & Quantity | NGK LMAR9G × 4 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTX9-BS / YTZ10S (12V 8.0–8.6Ah MF AGM) |
| Final Drive Maintenance | 520 Sealed O-Ring Chain (14T/48T) — 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 | 250 cc · 51 hp @ 15,500 rpm · 22.9 N·m (16.9 lb-ft) @ 14,500 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 785 mm (30.9 in) · 184 kg (406 lbs) |
| Fuel Tank & Est. Real-World Range | 15 L (4.0 US gal) · ~18.9 km/L → ~284 km (176 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 12,000 km / 12,000 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
Launched in 2020 as chassis ZX250E, the 2023 ZX250G/H update added a color TFT dash and the ZX-25RR grade with preload-adjustable SFF-BP forks and Showa BFRC-lite shock.
Oil & Clutch Mechanical Engineering Note
Spinning past 17,000 rpm shears oil rapidly in the 249.8cc inline-four, so full-synthetic SAE 10W-40 JASO MA2 with OEM filter 16097-0008 (HF303) at 2.9 L is strongly advised.
Garage Wrenching Gotchas
- Lower right fairing push-rivets and heat-shield clips turn brittle from header heat; label clip positions before removing the lower cowl for oil filter access.
- Replacing the four long-reach NGK LMAR9G plugs requires lifting the tank and airbox assembly completely; torque strictly to 12 N·m in the compact head.
5. Frequently Asked Questions (FAQ)
What oil volume, JASO grade, and oil filter code does the Kawasaki Ninja ZX-25R (2020–Present) require?
Because its wet multi-plate clutch shares engine oil with the gearbox, run SAE 10W-40 (JASO MA2) at 2.5 L (2.64 US qt) drain-only and 2.9 L (3.06 US qt) with filter (16097-0008 / HF303).
How do you accurately check the oil level on the Ninja ZX-25R, 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 29 N·m with a new crush washer. Factory oil change intervals are every 12,000 km, with valve clearance inspection every 24,000 km.
What are the cold tire pressures, puncture repair type, seat height, and range of the Ninja ZX-25R?
Fitted with 110/70 R17 M/C 54H front and 150/60 R17 M/C 66H rear tubeless rims (compatible with roadside plug kits), set cold tire pressures to 29 / 33 PSI (200/225 kPa) solo or 29 / 33 PSI loaded. Seat height is 785 mm (30.9 in) at 184 kg wet weight, delivering ~284 km per 15 L tank.