Yamaha XMAX 250 (BG6 / SG42J / SG70J) — OEM Fluid, Tire Pressure & Maintenance Specs
249cc Liquid-Cooled Single SOHC 4-Valve Blue Core (Dual-Clamp Fork) · Source: Yamaha XMAX 250 (BG6 / SG42J / SG70J) (2018–Present) Official Owner’s Manual Maintenance Specifications
According to the Yamaha XMAX 250 (BG6 / SG42J / SG70J) (2018–Present) Official Owner’s Manual Maintenance Specifications, the 2018–Present Yamaha XMAX 250 (BG6 / SG42J / SG70J) (chassis SG42J/SG70J/BG6) requires 1.5 L (1.59 US qt) of SAE 10W-40 (JASO MB, API SG or higher) engine oil for a drain-only change and 1.6 L (1.69 US qt) with filter service (5YP-E3440-00 / HF141). Standard solo cold tire pressure is 200 kPa / 2.00 bar / 29 PSI front (120/70-15M/C 56P) and 225 kPa / 2.25 bar / 33 PSI rear (140/70-14M/C 62P), paired with 1× NGK LMAR8A-9 spark plug(s) and a YTZ8V battery.
Drain only: 1.5 L (1.59 US qt)
R 225 kPa (2.25 bar)
Est. Range: ~410 km (255 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Dry Centrifugal CVT Belt Drive |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-40 · JASO MB · API SG or higher |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 1.5 L (1.59 US qt) • With filter/strainer: 1.6 L (1.69 US qt) • Complete dry overhaul: 1.75 L (1.85 US qt) |
| OEM Oil Filter Code & Type | 5YP-E3440-00 / HF141 |
| Correct Oil Level Check Method | Hold upright on level ground; rest dipstick UNTHREADED on filler neck (do NOT screw in) |
| Oil Drain Bolt Torque | 20 N·m (14.8 lb-ft / 2.04 kgf·m) — Use fresh crush washer |
| Final Drive / Bevel Gear Oil | 200 ml (0.20 L) — SAE 10W-40 / 80W-90 (200 ml final gear oil) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 120/70-15M/C 56P · Rear: 140/70-14M/C 62P (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: 250 kPa / 2.50 bar / 36 PSI |
| OEM Spark Plug & Quantity | NGK LMAR8A-9 × 1 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTZ8V (12V 7.0Ah MF AGM) |
| Final Drive Maintenance | Dry V-Belt CVT Drive — Inspect/replace V-belt and rollers every 20,000–24,000 km |
| 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 | 249 cc · 22.8 hp @ 7,000 rpm · 24.3 N·m (17.9 lb-ft) @ 5,500 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 795 mm (31.3 in) · 181 kg (399 lbs) |
| Fuel Tank & Est. Real-World Range | 13 L (3.4 US gal) · ~31.5 km/L → ~410 km (255 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 / 15,000 km • Valve Clearance Check: 20,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Built for Japanese and Indonesian 250cc tax classes using a shorter 64.9 mm stroke inside the XMAX 300 chassis, the SG42J XMAX 250 gained X-motif LEDs and TFT connectivity on 2023+ SG70J units.
Oil & Clutch Mechanical Engineering Note
Sharing its bottom end and internal paper filter HF141 with the XMAX 300, refill 1.6 L with filter (1.5 L drain-only) of SAE 10W-40 JASO MB oil plus 200 ml gear oil.