Honda CB125R (JC91 DOHC Neo Sports Café) — OEM Fluid, Tire Pressure & Maintenance Specs
125cc Liquid-Cooled Single-Cylinder DOHC 4-Valve 15 hp Neo Sports Café (6-Speed Wet Multi-Plate) · Source: Honda CB125R (JC91 / CBF125NA) Official Owner’s Manual Maintenance Specifications
According to the Honda CB125R (JC91 / CBF125NA) Official Owner’s Manual Maintenance Specifications, the 2021–Present Honda CB125R (JC91 DOHC Neo Sports Café) (chassis JC91/CBF125NA) requires 0.85 L (0.90 US qt) of SAE 10W-30 (JASO MA, API SG or higher) engine oil for a drain-only change and 0.9 L (0.95 US qt) with filter service (15421-KSP-910 (Internal Oil Strainer Screen)). Standard solo cold tire pressure is 200 kPa / 2.00 bar / 29 PSI front (110/70R17 M/C 54H) and 225 kPa / 2.25 bar / 33 PSI rear (150/60R17 M/C 66H), paired with 1× NGK MR9C-9N spark plug(s) and a YTZ6V battery.
Drain only: 0.85 L (0.90 US qt)
R 225 kPa (2.25 bar)
Est. Range: ~460 km (286 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Multi-Plate Manual Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-30 (Alt: SAE 10W-40) · JASO MA · API SG or higher |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 0.85 L (0.90 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-KSP-910 (Internal 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 | 24 N·m (17.7 lb-ft / 2.45 kgf·m) — Use fresh crush washer |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 110/70R17 M/C 54H · Rear: 150/60R17 M/C 66H (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: 225 kPa / 2.25 bar / 33 PSI |
| OEM Spark Plug & Quantity | NGK MR9C-9N × 1 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTZ6V (12V 5.0Ah MF AGM) |
| Final Drive Maintenance | 428 Sealed O-Ring Chain (126 links) — Maintain 25–35 mm slack |
| Brake Fluid & Coolant | DOT 4 · Pro Honda HP Silicate-Free Ethylene Glycol Coolant (~0.65 L) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 125 cc · 15 hp @ 10,000 rpm · 11.6 N·m (8.6 lb-ft) @ 8,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 816 mm (32.1 in) · 130 kg (287 lbs) |
| Fuel Tank & Est. Real-World Range | 10.1 L (2.7 US gal) · ~45.5 km/L → ~460 km (286 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 6,000 km / 12,000 km • Air Filter / Spark Plug: 18,000 km / 12,000 km • Valve Clearance Check: 24,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
From 2021 onward (JC91), the CB125R gained a 15 hp DOHC 4-valve engine and 41 mm Showa SFF-BP forks (plus a 5-inch TFT dash in 2024), replacing the 2018–2020 JC79 SOHC 2-valve motor.
Oil & Clutch Mechanical Engineering Note
Despite revving to 10,000+ rpm, the JC91 DOHC engine uses an internal mesh oil strainer screen (15421-KSP-910) behind the right clutch cover with no external cartridge filter. Because total drain refill is just 0.85 L, refresh SAE 10W-30 JASO MA oil promptly.
Garage Wrenching Gotchas
- Do not buy CB300R paper oil filters (HF103) for a CB125R—there is no external filter cavity on the JC91 crankcase; routine service is a clean 0.85 L drain-and-fill.
- Wearing oversize 110/70R17 and 150/60R17 radial tires on a featherlight 130 kg chassis, keep cold inflation at 200 kPa (29 PSI) front and 225 kPa (33 PSI) rear.
5. Frequently Asked Questions (FAQ)
Does the 2021+ Honda CB125R (JC91) have a replaceable oil filter?
No external cartridge filter is fitted; filtration uses an internal washable mesh screen (15421-KSP-910) inside the right clutch cover, requiring 0.85 L on a normal drain or 0.90 L after cover removal.
What spark plug and valve interval apply to the DOHC CB125R?
Honda specifies a single NGK MR9C-9N spark plug every 12,000 km and shim-under-bucket DOHC valve clearance checks every 24,000 km.
How far can a Honda CB125R travel on a full tank?
With a 10.1 L tank and ~45.5 km/L fuel efficiency, riders routinely achieve over 440 km (270+ miles) per tank.