Yamaha SR400 Final Edition (RH03 / RH16 FI) — OEM Fluid, Tire Pressure & Maintenance Specs
399cc Air-Cooled Single SOHC 2-Valve FI (Frame Dry-Sump Kickstart) · Source: Yamaha SR400 Final Edition (RH03 / RH16 FI) (2010–2021) Official Owner’s Manual Maintenance Specifications
According to the Yamaha SR400 Final Edition (RH03 / RH16 FI) (2010–2021) Official Owner’s Manual Maintenance Specifications, the 2010–2021 Yamaha SR400 Final Edition (RH03 / RH16 FI) (chassis RH03J/RH16J) requires 2 L (2.11 US qt) of SAE 10W-40 (JASO MA2, API SG or higher) engine oil for a drain-only change and 2.1 L (2.22 US qt) with filter service (4X7-13440-90 / HF145). Standard solo cold tire pressure is 175 kPa / 1.75 bar / 25 PSI front (90/100-18M/C 54S) and 200 kPa / 2.00 bar / 29 PSI rear (110/90-18M/C 61S), paired with 1× NGK BPR6ES spark plug(s) and a GT4B-5 battery.
Drain only: 2 L (2.11 US qt)
R 200 kPa (2.00 bar)
Est. Range: ~348 km (216 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 20W-40 / 15W-50) · JASO MA2 · API SG or higher |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 2 L (2.11 US qt) • With filter/strainer: 2.1 L (2.22 US qt) • Complete dry overhaul: 2.4 L (2.54 US qt) |
| OEM Oil Filter Code & Type | 4X7-13440-90 / HF145 |
| Correct Oil Level Check Method | Dry-sump oil tank — warm engine to operating temperature and check oil tank/frame dipstick immediately after shutdown per OEM procedure (never top up cold) |
| Oil Drain Bolt Torque | 30 N·m (22.1 lb-ft / 3.06 kgf·m) — Use fresh crush washer |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 90/100-18M/C 54S · Rear: 110/90-18M/C 61S (Tube-Type Spoke Rim) |
|---|---|
| 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: 200 kPa / 2.00 bar / 29 PSI Rear: 225 kPa / 2.25 bar / 33 PSI |
| OEM Spark Plug & Quantity | NGK BPR6ES × 1 (Gap: 0.7–0.8 mm) |
| OEM Battery Code & Rating | GT4B-5 (12V 2.5Ah Sealed (Kickstart)) |
| Final Drive Maintenance | 428 Drive Chain — Maintain 20–30 mm slack and lubricate regularly |
| 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 · 24 hp @ 6,500 rpm · 28 N·m (20.7 lb-ft) @ 3,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 790 mm (31.1 in) · 175 kg (386 lbs) |
| Fuel Tank & Est. Real-World Range | 12 L (3.2 US gal) · ~29 km/L → ~348 km (216 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 5,000 km / 10,000 km • Air Filter / Spark Plug: 15,000 km / 10,000 km • Valve Clearance Check: 10,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Fuel injection arrived in 2010 on chassis RH03J, followed by evaporative-emissions updates on the 2018–2021 RH16J Final Edition that closed out 43 years of production.
Oil & Clutch Mechanical Engineering Note
Using a dry-sump backbone frame tank, you must drain both the lower frame downtube bolt and the crankcase sump plug, then refill 2.1 L (with HF145 paper filter) of JASO MA2 oil.
Garage Wrenching Gotchas
- Crack open the small M5 bleed screw above the right-side oil filter cover at idle after every oil change until oil weeps out, confirming oil pump prime to the rocker arms.
- Never top up oil from a cold frame-dipstick reading; oil slowly wetsumps past the check ball overnight, so always warm the engine for several minutes before checking.
5. Frequently Asked Questions (FAQ)
What oil volume, JASO grade, and oil filter code does the Yamaha SR400 Final Edition (RH03 / RH16 FI) (2010–2021) require?
Because its wet multi-plate clutch shares engine oil with the gearbox, run SAE 10W-40 (JASO MA2) at 2 L (2.11 US qt) drain-only and 2.1 L (2.22 US qt) with filter (4X7-13440-90 / HF145).
How do you accurately check the oil level on the SR400 Final Edition (RH03 / RH16 FI), and what are its service intervals?
Because this dry-sump engine scavenges oil into a separate tank while running, always measure immediately after a full warm-up; checking stone-cold after sitting misleads riders into massive overfilling. Torque the drain plug to 30 N·m with a new crush washer. Factory oil change intervals are every 5,000 km, with valve clearance inspection every 10,000 km.
What are the cold tire pressures, puncture repair type, seat height, and range of the SR400 Final Edition (RH03 / RH16 FI)?
Equipped with 90/100-18M/C 54S front and 110/90-18M/C 61S rear tube-type rims (mushroom/string plugs will not seal—carry spare inner tubes), set cold tire pressures to 25 / 29 PSI (175/200 kPa) solo or 29 / 33 PSI loaded. Seat height is 790 mm (31.1 in) at 175 kg wet weight, delivering ~348 km per 12 L tank.