Kawasaki W400 (EJ400A) — OEM Fluid, Tire Pressure & Maintenance Specs
399cc Air-Cooled 360° Vertical-Twin SOHC 8-Valve (Short-Stroke Bevel-Gear Twin) · Source: Kawasaki W400 (EJ400A) (2006–2008) Official Owner’s Manual Maintenance Specifications
According to the Kawasaki W400 (EJ400A) (2006–2008) Official Owner’s Manual Maintenance Specifications, the 2006–2008 Kawasaki W400 (EJ400A) (chassis EJ400A) 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 2.8 L (2.96 US qt) with filter service (16097-0008 / HF303). Standard solo cold tire pressure is 200 kPa / 2.00 bar / 29 PSI front (100/90-19 M/C 57H) and 225 kPa / 2.25 bar / 33 PSI rear (130/80-18 M/C 66H), paired with 2× NGK CR8E spark plug(s) and a YTX12-BS battery.
Drain only: 2.5 L (2.64 US qt)
R 225 kPa (2.25 bar)
Est. Range: ~345 km (214 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: 2.8 L (2.96 US qt) • Complete dry overhaul: 3 L (3.17 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: 100/90-19 M/C 57H · Rear: 130/80-18 M/C 66H (Tube-Type Spoke Rim) |
|---|---|
| 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: 250 kPa / 2.50 bar / 36 PSI |
| OEM Spark Plug & Quantity | NGK CR8E × 2 (Gap: 0.7–0.9 mm) |
| OEM Battery Code & Rating | YTX12-BS (12V 10.0Ah MF AGM) |
| Final Drive Maintenance | 520 Sealed O/X-Ring Chain — Maintain 25–35 mm slack and lube every 800–1,000 km |
| Brake Fluid & Coolant | DOT 4 · Air/Oil-Cooled Engine (No liquid coolant) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 399 cc · 29 hp @ 7,500 rpm · 29 N·m (21.4 lb-ft) @ 6,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 765 mm (30.1 in) · 209 kg (461 lbs) |
| Fuel Tank & Est. Real-World Range | 15 L (4.0 US gal) · ~23 km/L → ~345 km (214 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 6,000 km / 12,000 km • Air Filter / Spark Plug: 12,000 km / 12,000 km • Valve Clearance Check: 12,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Short-stroke (72×49 mm) 399cc bevel-gear vertical twin built on the W650 chassis with lowered 765 mm suspension for Japanese 400cc riders.
Oil & Clutch Mechanical Engineering Note
Kawasaki single-cylinder retro & dual-sport family (Z125, W230, KLX230/250/300, KLR650) running internal paper element HF112 and SAE 10W-40 JASO MA2.