SYM Jet X 125 — OEM Fluid, Tire Pressure & Maintenance Specs
124.6cc Liquid-Cooled Single SOHC 4-Valve Keyless Sport Commuter · Source: SYM Jet X 125 (2021–Present) Official Owner’s Manual Maintenance Specifications
According to the SYM Jet X 125 (2021–Present) Official Owner’s Manual Maintenance Specifications, the 2021–Present SYM Jet X 125 (chassis XA12W1) requires 0.8 L (0.85 US qt) of SAE 10W-40 (JASO MB, API SJ/SL Synthetic Blend 10W-40) engine oil for a drain-only change and 0.9 L (0.95 US qt) with filter service (15421-GY6-900 (Strainer Screen & O-Ring)). Standard solo cold tire pressure is 180 kPa / 1.80 bar / 26 PSI front (100/90-14 51P) and 200 kPa / 2.00 bar / 29 PSI rear (110/80-14 59P), paired with 1× NGK CPR8EA-9 spark plug(s) and a YTX7A-BS battery.
Drain only: 0.8 L (0.85 US qt)
R 200 kPa (2.00 bar)
Est. Range: ~296 km (184 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Dry Centrifugal CVT Belt Drive |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-40 · JASO MB · API SJ/SL Synthetic Blend 10W-40 |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 0.8 L (0.85 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 | 15421-GY6-900 (Strainer Screen & O-Ring) |
| Correct Oil Level Check Method | Hold upright on level ground; rest dipstick UNTHREADED on filler neck (do NOT screw in) |
| Oil Drain Bolt Torque | 25 N·m (18.4 lb-ft / 2.55 kgf·m) — Use fresh crush washer |
| Final Drive / Bevel Gear Oil | 100 ml (0.10 L) — SAE 85W-140 / 10W-40 (110–180 ml rear reduction gear oil) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 100/90-14 51P · Rear: 110/80-14 59P (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 180 kPa / 1.80 bar / 26 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: 225 kPa / 2.25 bar / 33 PSI |
| OEM Spark Plug & Quantity | NGK CPR8EA-9 × 1 (Gap: 0.7–0.8 mm) |
| OEM Battery Code & Rating | YTX7A-BS (12V 6.0Ah MF 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 · OAT ethylene-glycol coolant for aluminum radiators (50:50 premix) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 125 cc · 12.6 hp @ 8,000 rpm · 11.5 N·m (8.5 lb-ft) @ 6,500 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 770 mm (30.3 in) · 140 kg (309 lbs) |
| Fuel Tank & Est. Real-World Range | 7.5 L (2.0 US gal) · ~39.5 km/L → ~296 km (184 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 300 km • Engine Oil / Filter: 3,000 km / 6,000 km • Air Filter / Spark Plug: 6,000 km / 10,000 km • Valve Clearance Check: 10,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Upgraded sport-commuter sibling to the Jet 14 trading the flat floor for a stiffer center-backbone tunnel, keyless fob, and auto-dimming LCD.
Oil & Clutch Mechanical Engineering Note
With only 0.8–0.9 L of SAE 10W-40 JASO MB in the crankcase, check the unthreaded dipstick regularly and clean the bottom mesh screen every 6,000 km.