Vespa ET4 125 (LEADER 4T) — OEM Fluid, Tire Pressure & Maintenance Specs
124cc Forced Air-Cooled 4-Stroke Single SOHC 2-Valve Carbureted · Source: Vespa ET4 125 (LEADER 4T) (1996–2005) Official Owner’s Manual Maintenance Specifications
According to the Vespa ET4 125 (LEADER 4T) (1996–2005) Official Owner’s Manual Maintenance Specifications, the 1996–2005 Vespa ET4 125 (LEADER 4T) (chassis ZAPM04000/ZAPM19000) requires 0.95 L (1.00 US qt) of SAE 5W-40 (JASO MA2, API SL / ACEA A3 Full Synthetic 5W-40) engine oil for a drain-only change and 1.1 L (1.16 US qt) with filter service (Piaggio 82635R / HF183). Standard solo cold tire pressure is 160 kPa / 1.60 bar / 23 PSI front (100/80-10 53L) and 200 kPa / 2.00 bar / 29 PSI rear (120/70-10 54L), paired with 1× NGK CR8EB / Champion RG6YC spark plug(s) and a YB9-B battery.
Drain only: 0.95 L (1.00 US qt)
R 200 kPa (2.00 bar)
Est. Range: ~297 km (185 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Dry Centrifugal CVT Belt Drive |
|---|---|
| Recommended Viscosity & Grade | SAE 5W-40 · JASO MA2 · API SL / ACEA A3 Full Synthetic 5W-40 |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 0.95 L (1.00 US qt) • With filter/strainer: 1.1 L (1.16 US qt) • Complete dry overhaul: 1.25 L (1.32 US qt) |
| OEM Oil Filter Code & Type | Piaggio 82635R / HF183 |
| Correct Oil Level Check Method | Upright on level ground; screw dipstick ALL THE WAY IN, then remove to read level |
| Oil Drain Bolt Torque | 24 N·m (17.7 lb-ft / 2.45 kgf·m) — Use fresh crush washer |
| Final Drive / Bevel Gear Oil | 150 ml (0.15 L) — SAE 80W-90 GL-4/GL-5 (200–270 ml rear hub gear oil) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 100/80-10 53L · Rear: 120/70-10 54L (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 160 kPa / 1.60 bar / 23 PSI Rear: 200 kPa / 2.00 bar / 29 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 180 kPa / 1.80 bar / 26 PSI Rear: 220 kPa / 2.20 bar / 32 PSI |
| OEM Spark Plug & Quantity | NGK CR8EB / Champion RG6YC × 1 (Gap: 0.7–0.8 mm) |
| OEM Battery Code & Rating | YB9-B (12V 9.0Ah Conventional/AGM) |
| Final Drive Maintenance | Dry Centrifugal V-Belt CVT — Inspect/replace V-belt and rollers every 15,000–20,000 km |
| Brake Fluid & Coolant | DOT 4 · Air/Oil-Cooled Engine (No liquid coolant) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 124 cc · 10.9 hp @ 8,000 rpm · 10.2 N·m (7.5 lb-ft) @ 6,500 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 785 mm (30.9 in) · 112 kg (247 lbs) |
| Fuel Tank & Est. Real-World Range | 9 L (2.4 US gal) · ~33 km/L → ~297 km (185 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 10,000 km / 10,000 km • Air Filter / Spark Plug: 10,000 km / 10,000 km • Valve Clearance Check: 20,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Vespa’s very first 4-stroke automatic scooter; 1996–1999 pre-LEADER (ZAPM04) engines gave way in 2000+ to the much more reliable ZAPM19 LEADER unit.
Oil & Clutch Mechanical Engineering Note
ZAPM19 LEADER engines take ~1.1 L of synthetic SAE 5W-40 with spin-on filter 82635R plus 150 ml of SAE 80W-90 hub oil.