Honda MSX125 Grom (JC92 5-Speed) — OEM Fluid, Tire Pressure & Maintenance Specs
124cc Air-Cooled Horizontal Single SOHC 2-Valve 5-Speed Mini Streetfighter (Wet Multi-Plate) · Source: Honda MSX125 Grom (JC92) Official Owner’s Manual Maintenance Specifications
According to the Honda MSX125 Grom (JC92) Official Owner’s Manual Maintenance Specifications, the 2021–Present Honda MSX125 Grom (JC92 5-Speed) (chassis JC92) requires 0.85 L (0.90 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 (15412-K0N-D01 / 15412-MGS-D21 (HF117)). Standard solo cold tire pressure is 200 kPa / 2.00 bar / 29 PSI front (120/70-12 M/C 51P) and 200 kPa / 2.00 bar / 29 PSI rear (130/70-12 M/C 56P), paired with 1× NGK CPR7EA-9S spark plug(s) and a YTZ5S battery.
Drain only: 0.85 L (0.90 US qt)
R 200 kPa (2.00 bar)
Est. Range: ~390 km (242 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: 0.85 L (0.90 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 | 15412-K0N-D01 / 15412-MGS-D21 (HF117) |
| 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 M/C 51P · Rear: 130/70-12 M/C 56P (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 CPR7EA-9S × 1 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTZ5S (12V 3.5Ah MF AGM) |
| Final Drive Maintenance | 420 Drive Chain (108 links, 15T/38T sprockets) — Maintain 30–40 mm slack |
| Brake Fluid & Coolant | DOT 4 · Air-Cooled Horizontal Engine (No liquid coolant) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 124 cc · 9.8 hp @ 7,250 rpm · 10.5 N·m (7.7 lb-ft) @ 5,500 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 761 mm (30.0 in) · 103 kg (227 lbs) |
| Fuel Tank & Est. Real-World Range | 6 L (1.6 US gal) · ~65 km/L → ~390 km (242 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: 6,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
The 2021+ Gen 3 MSX125 Grom (JC92) introduced a 5-speed gearbox, gear indicator, and external paper oil filter element (15412-K0N-D01). Earlier 2013–2020 4-speed JC61/JC75 Groms had no cartridge filter and relied on an internal centrifugal spinner.
Oil & Clutch Mechanical Engineering Note
Because riders frequently feather the Grom’s manual clutch during gymkhana practice and high-rpm commuting, fresh full-synthetic SAE 10W-30 or 10W-40 JASO MA oil (0.90 L with filter) dramatically improves neutral selection at stops.
Garage Wrenching Gotchas
- The factory non-sealed 420 chain stretches rapidly during its first few thousand kilometers; inspect 30–40 mm slack every 500 km and lock both swingarm adjuster nuts securely.
- Tighten the two M6 bolts on the right-hand oil filter cap gently (~12 N·m); over-torquing strips the soft aluminum clutch cover threads.
5. Frequently Asked Questions (FAQ)
How much engine oil does the 5-speed Honda Grom 125 (JC92) take?
Service refill is 0.90 L (0.95 US qt) with paper oil filter replacement (~0.85 L drain-only, 1.10 L dry engine overhaul) using SAE 10W-30 JASO MA oil.
What tire sizes and cold tire pressures fit the Honda MSX125 Grom?
It wears 120/70-12 front and 130/70-12 rear tubeless tires inflated to 200 kPa (29 PSI) cold at both ends.
Why is the MSX125 Grom considered the ultimate manual clutch trainer?
Combining a 761 mm seat height, slim waist, and 103 kg wet weight with a forgiving 5-speed clutch and ~390 km fuel range, it builds manual-shift confidence without drop anxiety.