Honda Grom
Every consumable spec for the Honda Grom, each fact sourced, dated, and shown with the source it came from. US-market reference — verify against your owner's manual.
125 minimoto · 2014–present · 124cc air-cooled single
Three generations, split at 2017 (JC75 restyle) and 2022 (JC92, new 5-speed engine); no 2021 US model year.
Trims & editions
- SP editions (color/graphics packages across all three generations) — cosmetic only, no fitment differences. Covered by this sheet.
Spec plate
+1 source, quotes
- Honda MSX125 (Grom) 2018 Owner's Manual (32K26F10, JC75 4-speed) Selecting the Engine Oil / Specifications (opens in new tab)
“API classification*3: SG or higher ... *3. The API classification specifies the quality and performance rating of engine oils. Use SG or higher oils, excluding oils marked as “Energy Conserving” or “Resource Conserving” on the circular API service symbol.”
- Honda MSX Grom 2021 Owner's Manual (4PK26J10, JC92 5-speed) Specifications (opens in new tab)
“Recommended engine oil: Honda 4-stroke motorcycle oil API Service Classification SG or higher, excluding oils marked as “Energy Conserving” or “Resource Conserving,” SAE 10W-30, JASO T 903 standard MA”
+1 source, quotes
- Honda MSX125 (Grom) 2018 Owner's Manual (32K26F10, JC75 4-speed) Specifications (opens in new tab)
“Engine oil capacity: After draining 0.9 litres (1.0 US qt, 0.8 Imp qt) / After disassembly 1.1 litres (1.2 US qt, 1.0 Imp qt)”
- Honda MSX Grom 2021 Owner's Manual (4PK26J10, JC92 5-speed) Specifications (opens in new tab)
“Engine oil capacity: After draining 0.9 L (1.0 US qt, 0.8 Imp qt) / After draining & engine oil filter change 0.9 L (1.0 US qt, 0.8 Imp qt) / After disassembly 1.05 L (1.11 US qt, 0.92 Imp qt)”
We list the manual's 'with filter change' figure — not the dry-rebuild total that circulates online. On small engines that difference is a 25% overfill.
+1 source, quotes
- Honda MSX125 (Grom) 2018 Owner's Manual (32K26F10, JC75 4-speed) Specifications (opens in new tab)
“Spark plugs (standard) CPR6EA-9 (NGK) or U20EPR9 (DENSO); (for extended high speed riding) CPR7EA-9 (NGK) or U22EPR9 (DENSO)”
- Honda MSX Grom 2021 Owner's Manual (4PK26J10, JC92 5-speed) Specifications (opens in new tab)
“Spark plug (standard) CPR7EA-9S (NGK)”
+1 source, quotes
- Honda MSX125 (Grom) 2018 Owner's Manual (32K26F10, JC75 4-speed) Maintenance Fundamentals (opens in new tab)
“Recommended brake fluid: Honda DOT 3 or DOT 4 Brake Fluid or equivalent”
- Honda MSX Grom 2021 Owner's Manual (4PK26J10, JC92 5-speed) (opens in new tab)
+2 sources, quotes
- Honda MSX125 (Grom) 2018 Owner's Manual (32K26F10, JC75 4-speed) Specifications (opens in new tab)
“Standard drive chain DID 420D No. of links 106 ... Drive sprocket 15T Driven sprocket 34T”
- Honda MSX Grom 2021 Owner's Manual (4PK26J10, JC92 5-speed) Specifications (opens in new tab)
“Standard drive chain DID 420D2 No. of links 108 ... Drive sprocket 15T Driven sprocket 38T”
- JT Sprockets Application Guide 2024 (opens in new tab)
Not yet verified against a primary source — carry this as a gap, not a spec. Check your owner's manual before you rely on it.
full citation
- Honda MSX125 (Grom) 2018 Owner's Manual (32K26F10, JC75 4-speed) Torque Specifications (opens in new tab)
“Engine oil drain bolt 24 N·m (2.4 kgf·m, 18 lbf·ft)”
full citation
- Honda MSX125 (Grom) 2018 Owner's Manual (32K26F10, JC75 4-speed) Torque Specifications (opens in new tab)
“Front axle nut 54 N·m (5.5 kgf·m, 40 lbf·ft)”
Oil capacities are the manufacturer's with-filter-change figure, not the dry-rebuild total that circulates online. Always verify against your own owner's manual before you turn a wrench — this is educational reference, not a repair procedure.
Service intervals
| Years | Oil & filter |
|---|---|
| 2014–present | 4,000 mi / 12 mo |
Street, track, mixed
Street
- We list the manual's 'with filter change' figure — not the dry-rebuild total that circulates online. On small engines that difference is a 25% overfill.
- Pads fit calipers, not bikes. That's why one shape number covers a Hayabusa and a V-Strom — and why the same bike model can change shape mid-generation. We resolve pads by caliper and year.
Track
- After track days, shorten your oil change. How much is genuinely unsettled — manufacturers say 'adjust to your use,' not a number. Used-oil analysis is the only rigorous answer.
- A street-legal sintered or EPFA-class pad is the manufacturer-sanctioned track-day choice. Full race compounds are for when the pad is the limiting factor — and yours isn't yet.
- RBF-class fluid buys you ~80°C more fade margin when fresh — and gives most of it back within a year as it absorbs moisture. It's a consumable you change more often, not an upgrade you install once.
- For the street: silicate-free motorcycle coolant (Honda's manuals explain why — silicates chew water-pump seals). For the track: check your org's rules — most ban ethylene glycol outright; pro racing allows water only.
Mixed
Run the street specs above, then shorten the oil interval after track days — how much is genuinely unsettled, so used-oil analysis is the honest guide. If your organisation tech-inspects coolant, check its rules before a session.
Maintenance jobs & what they cost
Oil & filter change
Beginner-safeParts — Oil spec JASO MA · API SG · Viscosity 10W-30 · Oil capacity with filter 0.9 L · drain not published · dry total 1.05 L · Oil filter OEM 15412-MGS-D21 · HiFlo HF117 · Drain plug torque 24 Nm
Tools — torque wrench, oil filter wrench, drain pan, funnel, new sealing washer (if your bike uses one)
Dealer oil-change quotes run $90–130 (Harley outliers $180–280 excluded); independent-shop average is closer to $56. DIY consumables run $30–60, saving roughly $40–120 per change with tooling paid back in 2–3 changes. Sourced: CostHack / Trak Powersports / J.D. Power, aggregated in docs/research/demand-competition.md.
Some links may earn TOSPEC a commission at no cost to you. Prices shown are typical street prices for consumables (oil, pads, chains, filters, fluids) — always verify fitment and price at the retailer. Affiliate relationships are day-0 unmonetized (status "none" below) while the site scales; this file is the config that flips them on.
Front brake pads
Experience neededParts — Front brake pads EBC FA375HH (organic, HH) single front disc, all generations (rotor updated for ABS compatibility on later bikes) · 1 set
Tools — torque wrench, hex/Allen key set (caliper mounting bolts), C-clamp or piston-retraction tool, wire brush, brake cleaner
Editorial estimate, not separately itemized in the research corpus: a 0.5–1 hr front-pad swap at the same dealer shop-rate bracket implied by the oil-change pricing in docs/research/demand-competition.md, plus a $30–60 OEM/aftermarket pad set. Verify locally before quoting.
Some links may earn TOSPEC a commission at no cost to you. Prices shown are typical street prices for consumables (oil, pads, chains, filters, fluids) — always verify fitment and price at the retailer. Affiliate relationships are day-0 unmonetized (status "none" below) while the site scales; this file is the config that flips them on.
Chain & sprocket kit
Experience neededParts — Chain & sprockets 420 · 108 links · 15/38T
Tools — torque wrench, chain breaker / riveting tool, angle grinder or chain-link sizing tool, rear paddock stand, chain alignment tool
Editorial estimate, not separately itemized in the research corpus: a full chain-and-sprocket swap (wheel off, alignment, torque-critical rear axle) runs several labor hours at the shop-rate bracket implied by the oil-change pricing in docs/research/demand-competition.md, plus an $80–150 520/525/530 kit. Verify locally before quoting.
Some links may earn TOSPEC a commission at no cost to you. Prices shown are typical street prices for consumables (oil, pads, chains, filters, fluids) — always verify fitment and price at the retailer. Affiliate relationships are day-0 unmonetized (status "none" below) while the site scales; this file is the config that flips them on.
Brake fluid flush
Experience neededParts — Brake fluid Honda DOT 3 or DOT 4 Brake Fluid, or equivalent
Tools — torque wrench (bleeder and banjo bolts), vacuum brake bleeder or speed bleeders, clear tubing and catch bottle, syringe, fresh DOT-spec fluid, sealed bottle
Editorial estimate, not separately itemized in the research corpus: roughly 1 hr of bleed/flush labor at the shop-rate bracket implied by the oil-change pricing in docs/research/demand-competition.md, plus fluid. Verify locally before quoting.
Some links may earn TOSPEC a commission at no cost to you. Prices shown are typical street prices for consumables (oil, pads, chains, filters, fluids) — always verify fitment and price at the retailer. Affiliate relationships are day-0 unmonetized (status "none" below) while the site scales; this file is the config that flips them on.
Coolant flush
Experience neededParts — See the spec plate above.
Tools — torque wrench (drain bolt), drain pan, funnel, coolant hydrometer or refractometer, distilled water (if mixing concentrate)
Editorial estimate, not separately itemized in the research corpus: roughly 1 hr of coolant-flush labor at the shop-rate bracket implied by the oil-change pricing in docs/research/demand-competition.md, plus coolant. Verify locally before quoting.
Some links may earn TOSPEC a commission at no cost to you. Prices shown are typical street prices for consumables (oil, pads, chains, filters, fluids) — always verify fitment and price at the retailer. Affiliate relationships are day-0 unmonetized (status "none" below) while the site scales; this file is the config that flips them on.
Notes & corrections
Coverage gaps
Where the catalogues run out. Flagged in the open, never guessed at.
Oil filter: 2014–2021 (JC61/JC75, 4-speed) Groms have NO replaceable cartridge oil filter. Honda's own maintenance schedule for these years lists two dealer-only 'Clean' (not 'Replace') items instead: 'Engine Oil Strainer Screen' and 'Engine Oil Centrifugal Filter' — confirmed directly from the 2018 owner's manual's maintenance table (image-verified). A cartridge filter with a HiFlo/OEM part number first appears with the JC92 generation in 2022, alongside (not replacing) the same strainer screen.
TOSPEC research
Drain plug torque: No torque specifications table exists in the JC92 (2022+) owner's manual — Honda appears to have moved this data to the dealer-only Service Manual for this generation. Not asserting a value for JC92.
TOSPEC research
Front axle torque: No torque specifications table exists in the JC92 (2022+) owner's manual. Not asserting a value for JC92.
TOSPEC research
Research notes
Context from the research trail — how a fact was pinned down.
Oil spec: Identical wording confirmed for both the 4-speed (JC61/JC75) and 5-speed (JC92) engine families — no change despite the engine redesign.
TOSPEC research
Viscosity: No multi-grade temperature chart exists in this model's owner's manual, any generation — only a single fixed SAE grade is specified.
TOSPEC research
Coolant: Air-cooled single — no coolant system. Not a gap; the fact genuinely does not apply to this bike. No mention of 'coolant' appears anywhere in either owner's manual, confirming the air-cooled architecture.
TOSPEC research
Service intervals: Both generations' maintenance-schedule grids were verified by rendering the actual PDF page as an image (not just text extraction, since the grid uses non-text replace/inspect glyphs) — JC61/JC75 and JC92 show the identical cadence: oil replaced at every 4,000 mi interval or annually, whichever comes first, with no difference between the two engine families.
TOSPEC research
DIY & your warranty
Doing this yourself won't void your factory warranty. The federal Magnuson-Moss Warranty Act bars a manufacturer or dealer from voiding your warranty just because you — not the dealer — did routine maintenance. To deny a claim they must prove the specific work caused the specific defect. Use spec-compliant parts and fluids, and keep your receipts.
FTC on the Magnuson-Moss Warranty Act · Full guide: dealer or DIY?
Honda Grom maintenance FAQ
How much oil does the Honda Grom take?
About 0.9 litres with a filter change — the manufacturer's with-filter figure, not the larger dry-rebuild number that circulates online. Confirm against your owner's manual.
What oil does the Honda Grom need?
It calls for 10W-30, JASO MA, API SG. A wet clutch means the JASO class matters — don't substitute an energy-conserving car oil.
What brake pads fit the Honda Grom?
The front caliper (single front disc, all generations (rotor updated for ABS compatibility on later bikes)) takes EBC shape FA375HH. Pads are resolved by caliper and year, not by model name, so verify your caliper before you order.
How often does the Honda Grom need an oil change?
Every 4,000 miles or 12 months, whichever comes first, per the manufacturer's schedule. Shorten it after track days — used-oil analysis is the only rigorous answer to how much.