Aprilia RS4 125 / RS 125 GP Replica (4T) — OEM Fluid, Tire Pressure & Maintenance Specs
124.2cc Liquid-Cooled 4-Stroke Single DOHC 4-Valve · Source: Aprilia RS4 125 / RS 125 GP Replica (4T) (2011–Present) Official Owner’s Manual Maintenance Specifications
According to the Aprilia RS4 125 / RS 125 GP Replica (4T) (2011–Present) Official Owner’s Manual Maintenance Specifications, the 2011–Present Aprilia RS4 125 / RS 125 GP Replica (4T) (chassis ZD4TW000/ZD4KC000) requires 1 L (1.06 US qt) of SAE 5W-40 (JASO MA2, API SN Full Synthetic 10W-50) engine oil for a drain-only change and 1.15 L (1.22 US qt) with filter service (Piaggio 82658R / HF563). Standard solo cold tire pressure is 190 kPa / 1.90 bar / 28 PSI front (100/80-17 52S) and 210 kPa / 2.10 bar / 30 PSI rear (130/70-17 62S), paired with 1× NGK CR9EB / MR8BI-8 spark plug(s) and a YTX7L-BS battery.
Drain only: 1 L (1.06 US qt)
R 210 kPa (2.10 bar)
Est. Range: ~522 km (324 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Multi-Plate Manual Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 5W-40 (Alt: SAE 10W-40) · JASO MA2 · API SN Full Synthetic 10W-50 |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 1 L (1.06 US qt) • With filter/strainer: 1.15 L (1.22 US qt) • Complete dry overhaul: 1.3 L (1.37 US qt) |
| OEM Oil Filter Code & Type | Piaggio 82658R / HF563 |
| Correct Oil Level Check Method | Upright on level ground; screw dipstick ALL THE WAY IN, then remove to read level |
| Oil Drain Bolt Torque | 25 N·m (18.4 lb-ft / 2.55 kgf·m) — Use fresh crush washer |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 100/80-17 52S · Rear: 130/70-17 62S (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 190 kPa / 1.90 bar / 28 PSI Rear: 210 kPa / 2.10 bar / 30 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 200 kPa / 2.00 bar / 29 PSI Rear: 230 kPa / 2.30 bar / 33 PSI |
| OEM Spark Plug & Quantity | NGK CR9EB / MR8BI-8 × 1 (Gap: 0.7–0.8 mm) |
| OEM Battery Code & Rating | YTX7L-BS (12V 6.0Ah MF AGM) |
| Final Drive Maintenance | 520 Sealed X-Ring Chain — Maintain 25–35 mm slack and clean/lubricate regularly |
| Brake Fluid & Coolant | DOT 4 · OAT ethylene-glycol coolant for aluminum radiators (50:50 premix) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 124 cc · 15 hp @ 10,500 rpm · 11.2 N·m (8.3 lb-ft) @ 8,250 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 820 mm (32.3 in) · 144 kg (317 lbs) |
| Fuel Tank & Est. Real-World Range | 14.5 L (3.8 US gal) · ~36 km/L → ~522 km (324 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 6,000 km / 6,000 km • Air Filter / Spark Plug: 20,000 km / 20,000 km • Valve Clearance Check: 12,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Replaced the two-stroke legend in 2011+ with a clean 15 hp 4-stroke DOHC liquid-cooled single inside a true die-cast aluminum twin-spar chassis.
Oil & Clutch Mechanical Engineering Note
Revving past 10,500 rpm on a compact 1.15 L wet-clutch sump, change synthetic SAE 5W-40 JASO MA2 and paper element HF563 every 5,000–6,000 km.