Yamaha Cygnus Gryphus 125 (SEJ4J) — OEM Fluid, Tire Pressure & Maintenance Specs
124cc Liquid-Cooled Single SOHC 4-Valve Blue Core VVA (12-Inch Sport Scooter) · Source: Yamaha Cygnus Gryphus 125 (SEJ4J) (2020–Present) Official Owner’s Manual Maintenance Specifications
According to the Yamaha Cygnus Gryphus 125 (SEJ4J) (2020–Present) Official Owner’s Manual Maintenance Specifications, the 2020–Present Yamaha Cygnus Gryphus 125 (SEJ4J) (chassis SEJ4J/B8R/BKG) requires 0.9 L (0.95 US qt) of SAE 10W-40 (JASO MB, API SG or higher) engine oil for a drain-only change and 0.9 L (0.95 US qt) with filter service (B65-E3411-00 (Oil Strainer Screen)). Standard solo cold tire pressure is 175 kPa / 1.75 bar / 25 PSI front (120/70-12 51L) and 200 kPa / 2.00 bar / 29 PSI rear (130/70-12 56L), paired with 1× NGK CPR8EA-9 spark plug(s) and a YTZ7V / YTZ6V battery.
Drain only: 0.9 L (0.95 US qt)
R 200 kPa (2.00 bar)
Est. Range: ~256 km (159 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Dry Centrifugal CVT Belt Drive |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-40 (Alt: SAE 10W-30) · JASO MB · API SG or higher |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 0.9 L (0.95 US qt) • With filter/strainer: 0.9 L (0.95 US qt) • Complete dry overhaul: 1 L (1.06 US qt) |
| OEM Oil Filter Code & Type | B65-E3411-00 (Oil Strainer Screen) |
| 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 | 100 ml (0.10 L) — SAE 10W-40 / Gear Oil (100 ml rear gear case) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 120/70-12 51L · Rear: 130/70-12 56L (Tubeless) |
|---|---|
| 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: 175 kPa / 1.75 bar / 25 PSI Rear: 225 kPa / 2.25 bar / 33 PSI |
| OEM Spark Plug & Quantity | NGK CPR8EA-9 × 1 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTZ7V / YTZ6V (12V 6.0Ah 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 | 124 cc · 12 hp @ 8,000 rpm · 11 N·m (8.1 lb-ft) @ 6,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 785 mm (30.9 in) · 125 kg (276 lbs) |
| Fuel Tank & Est. Real-World Range | 6.1 L (1.6 US gal) · ~42 km/L → ~256 km (159 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 4,000 km / 8,000 km • Air Filter / Spark Plug: 12,000 km / 8,000 km • Valve Clearance Check: 12,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Succeeding five air-cooled Cygnus-X generations, the 2020+ Cygnus Gryphus (SEJ4J / B8R) switched completely to a liquid-cooled Blue Core VVA engine and stiffer 12-inch chassis.
Oil & Clutch Mechanical Engineering Note
Equipped with a right-side radiator and dry CVT, the Gryphus takes 0.9 L of SAE 10W-40 JASO MB engine oil and 100 ml of rear reduction gear oil.
Garage Wrenching Gotchas
- Because the side-mounted radiator sits low beside the right floorboard, rinse winter road salt gently from the fins and inspect the reservoir level under the floor mat.
- CVT variator bosses, belts, and exhaust mounts from air-cooled Cygnus-X models do not fit the liquid-cooled B8R Gryphus—verify 6th-gen part numbers before ordering.
5. Frequently Asked Questions (FAQ)
What are the engine oil and rear hub gear oil capacities for the Yamaha Cygnus Gryphus 125 (SEJ4J) scooter?
With an isolated dry CVT belt case, the engine requires 0.9 L drain-only or 0.9 L (0.95 US qt) with filter/screen (B65-E3411-00 (Oil Strainer Screen)) of SAE 10W-40 (JASO MB). Service the rear reduction hub separately (final drive 100 ml).
How do you accurately check the oil level on the Cygnus Gryphus 125 (SEJ4J), and what are its service intervals?
Hold the bike upright on level ground 2–3 minutes after shutdown, wipe the dipstick, and rest it on the filler threads without screwing it in (threading it in reads artificially high and risks oil starvation). Torque the drain plug to 20 N·m with a new crush washer. Factory oil change intervals are every 4,000 km, with valve clearance inspection every 12,000 km.
What are the cold tire pressures, puncture repair type, seat height, and range of the Cygnus Gryphus 125 (SEJ4J)?
Fitted with 120/70-12 51L front and 130/70-12 56L rear tubeless rims (compatible with roadside plug kits), set cold tire pressures to 25 / 29 PSI (175/200 kPa) solo or 25 / 33 PSI loaded. Seat height is 785 mm (30.9 in) at 125 kg wet weight, delivering ~256 km per 6.1 L tank.