Honda MSX125 / SF (JC61 / JC75 4-Speed) — OEM Fluid, Tire Pressure & Maintenance Specs
125cc Air-Cooled Horizontal Single SOHC 2V 4-Speed Manual · Source: Honda MSX125 / SF (JC61 / JC75 4-Speed) (2013–2020) Official Owner’s Manual Maintenance Specifications
According to the Honda MSX125 / SF (JC61 / JC75 4-Speed) (2013–2020) Official Owner’s Manual Maintenance Specifications, the 2013–2020 Honda MSX125 / SF (JC61 / JC75 4-Speed) (chassis JC61/JC75) requires 0.9 L (0.95 US qt) of SAE 10W-30 (JASO MA, API SJ or higher) engine oil for a drain-only change and 0.9 L (0.95 US qt) with filter service (15421-KSP-910 (Screen + Centrifugal Spinner)). Standard solo cold tire pressure is 200 kPa / 2.00 bar / 29 PSI front (120/70-12 51L) and 200 kPa / 2.00 bar / 29 PSI rear (130/70-12 56L), paired with 1× NGK CPR6EA-9S spark plug(s) and a YTZ5S battery.
Drain only: 0.9 L (0.95 US qt)
R 200 kPa (2.00 bar)
Est. Range: ~319 km (198 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 SJ 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: 1.1 L (1.16 US qt) |
| OEM Oil Filter Code & Type | 15421-KSP-910 (Screen + Centrifugal Spinner) |
| 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: 120/70-12 51L · Rear: 130/70-12 56L (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 200 kPa / 2.00 bar / 29 PSI Rear: 200 kPa / 2.00 bar / 29 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 200 kPa / 2.00 bar / 29 PSI Rear: 200 kPa / 2.00 bar / 29 PSI |
| OEM Spark Plug & Quantity | NGK CPR6EA-9S × 1 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTZ5S (12V 3.5Ah MF AGM) |
| Final Drive Maintenance | 428 Drive Chain — Maintain 20–30 mm slack and lubricate regularly |
| Brake Fluid & Coolant | DOT 4 · Air/Oil-Cooled Engine (No liquid coolant) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 125 cc · 9.8 hp @ 7,000 rpm · 10.9 N·m (8.0 lb-ft) @ 5,500 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 765 mm (30.1 in) · 104 kg (229 lbs) |
| Fuel Tank & Est. Real-World Range | 5.5 L (1.5 US gal) · ~58 km/L → ~319 km (198 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 6,000 km / 12,000 km • Air Filter / Spark Plug: 16,000 km / 12,000 km • Valve Clearance Check: 8,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Both JC61 (2013–2015 high exhaust) and JC75 MSX125SF (2016–2020 low exhaust, stacked LED headlight) run a 4-speed gearbox with NO cartridge oil filter, unlike the 2021+ 5-speed JC92.
Oil & Clutch Mechanical Engineering Note
Instead of a paper filter, 4-speed JC61/JC75 engines trap grit inside a centrifugal oil spinner behind the right crankcase cover—clean the spinner rotor every 12,000 km and use 0.9 L JASO MA oil.
Garage Wrenching Gotchas
- Do not buy an HF117 paper oil filter for a 2013–2020 4-speed Grom—order a right crankcase cover gasket and spinner gasket instead for centrifugal rotor cleaning.
- Stock unsealed 420 drive chains stretch rapidly on mini-motos; check 20–30 mm slack frequently or upgrade to a heavy-duty sealed 420 chain.
5. Frequently Asked Questions (FAQ)
Does the Honda MSX125 / SF (JC61 / JC75 4-Speed) use a replaceable oil filter, and what is its exact oil spec?
Instead of a disposable filter element, this engine uses a cleanable mesh oil screen (15421-KSP-910 (Screen + Centrifugal Spinner)). Refill 0.9 L for a routine drain or 0.9 L (0.95 US qt) after screen cleaning with SAE 10W-30 (JASO MA)—never JASO MB.
How do you accurately check the oil level on the MSX125 / SF (JC61 / JC75 4-Speed), 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 24 N·m with a new crush washer. Factory oil change intervals are every 6,000 km, with valve clearance inspection every 8,000 km.
What are the cold tire pressures, puncture repair type, seat height, and range of the MSX125 / SF (JC61 / JC75 4-Speed)?
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 29 / 29 PSI (200/200 kPa) solo or 29 / 29 PSI loaded. Seat height is 765 mm (30.1 in) at 104 kg wet weight, delivering ~319 km per 5.5 L tank.