Trail & family

Honda CRF125F 2025

Trail & family, 125cc 4T

Partly verified

From the owner’s manual: engine oil capacity 850 ml (28.7 fl oz), p. 148; front tire 70/100-17 40M, p. 151; rear tire 90/100-14 49M, p. 151. Checked 26 Sep 2026.

No CPSC recall found for the 2025 Honda CRF125F, checked 2026-10-15. Recalls

Spec card PDF

Gearing

4 of 5 filled

Stock front sprocket: 13T; Research level: Spec sheet (research) · checked 2026-09-25 source [1]
Stock rear sprocket: 46T; Research level: Spec sheet (research) · checked 2026-09-25 source [1]
Chain pitch: 428; Verified, read off the manual page: Manual p. 108 · checked 2026-09-26 source [2]
Stock chain links: Not yet verified
Stock final drive ratio: 3.538 : 1; Verified, read off the manual page: Manual p. 150 · checked 2026-09-26 source [2]

Wheels and tires

2 of 4 filled

Front rim: Not yet verified
Rear rim: Not yet verified
Front tire: 70/100-17 40M; Verified, read off the manual page: Manual p. 151 · checked 2026-09-26 source [2]
Rear tire: 90/100-14 49M; Verified, read off the manual page: Manual p. 151 · checked 2026-09-26 source [2]

Suspension

3 of 7 filled

Fork: 31mm leading-axle fork; Research level: Spec sheet (research) · checked 2026-09-25 source [1]
Fork travel: 133 mm (≈ 5.2 in, converted by MotoXSports); Verified, read off the manual page: Manual p. 151 · checked 2026-09-26 source [2]
Shock travel: 140 mm (≈ 5.5 in, converted by MotoXSports); Verified, read off the manual page: Manual p. 151 · checked 2026-09-26 source [2]
Stock fork spring rate: Not yet verified
Stock shock spring rate: Not yet verified
Static sag, bike only: Not yet verified
Race sag, rider on: Not yet verified

Fluids and capacities

3 of 3 filled

Engine oil spec: SAE 10W-30, JASO T 903 MA; Verified, read off the manual page: Manual p. 149 · checked 2026-09-26 source [2]
Engine oil capacity: 850 ml (≈ 28.7 fl oz, converted by MotoXSports); Verified, read off the manual page: Manual p. 148 · checked 2026-09-26 source [2]
Fuel capacity: 3.7 L (≈ 0.98 gal, converted by MotoXSports); Verified, read off the manual page: Manual p. 148 · checked 2026-09-26 source [2]

Maintenance

3 of 3 filled

Tire pressure (off-road): 15 psi (100 kPa) front and rear; Verified, read off the manual page: Manual p. 151 · checked 2026-09-26 source [2]
Chain slack: 25-35 mm (1-1 3/8 in); Verified, read off the manual page: Manual p. 150 · checked 2026-09-26 source [2]
Spark plug and gap: NGK CPR6EA-9, gap 0.80-0.90 mm; Verified, read off the manual page: Manual p. 150 · checked 2026-09-26 source [2]

Dimensions

3 of 3 filled

Seat height: 29.1 inches (≈ 739 mm, converted by MotoXSports); Research level: Spec sheet (research) · converted from 29.1 inches · checked 2026-09-25 source [1]
Wheelbase: 1220 mm (≈ 48.0 in, converted by MotoXSports); Verified, read off the manual page: Manual p. 148 · checked 2026-09-26 source [2]
Weight: 194 pounds (≈ 88 kg, converted by MotoXSports); Research level: Spec sheet (research) · converted from 194 pounds · checked 2026-09-25 source [1]

Service specs

0 of 5 filled

Fork oil, brake fluid, fuel octane, idle speed, valve clearance: Not yet verified

Solid marks are owner's-manual pages; hollow marks are manufacturer web or spec-sheet figures still waiting on a manual page. Last reviewed 2026-09-26. Rows marked not yet verified are blank on purpose.

Buying parts

The stock sizes and specs this bike left the factory with, each with its source. Take them to any shop.

Retailer links below are affiliate links: we may earn a commission, at no cost to you, and it never changes the specs. Affiliate disclosure.

Chain: Chain pitch 428 Owner's manual p. 108428 chains at MotoSport 428 master links at MotoSport
Sprockets: Stock front sprocket 13T Manufacturer spec sheet (research)Stock rear sprocket 46T Manufacturer spec sheet (research)13T front sprockets at MotoSport 46T rear sprockets at MotoSport
Tires: Front tire 70/100-17 40M Owner's manual p. 151Rear tire 90/100-14 49M Owner's manual p. 151Front tires 70/100-17 at MotoSport Tubes 70/100-17 at MotoSport Rear tires 90/100-14 at MotoSport Tubes 90/100-14 at MotoSport
Engine oil: Engine oil spec SAE 10W-30, JASO T 903 MA Owner's manual p. 149Engine oil capacity 850 ml (28.7 fl oz) Owner's manual p. 148Engine oil at MotoSport

In stock at MotoSport

Prices from MotoSport’s catalog of Oct 26, 2026; check today’s price before you buy.

Front tire, stock size 70/100-17

Rear tire, stock size 90/100-14

Engine oil, stock viscosity 10W-30

Matched on viscosity only. The manual prints: SAE 10W-30, JASO T 903 MA. Check the label for the rest.

Spark plug, stock NGK CPR6EA-9

NGKSpark Plug - CPR6EA-9$8.96 ~~was $14.95~~ SaleBuy at MotoSport

Prices and stock from MotoSport's product catalog on Oct 26, 2026; they change, so check the price at MotoSport before you buy. Products are chosen by exact stock size, code or oil viscosity from the specs above, known brands first, then price. We have not tested them.

3 part specs not yet verified; see data coverage.

Use this bike

Tools for this bike

Compare with

Comparisons with other bikes use the newest model year on file: Honda CRF125F 2026.

Other model years

All 4 model years, 2023 to 2026, side by side

Riding

Where kids can ride: tracks and areas whose own pages mention young riders.

Gearing calculator

Gearing for this bike

Put your current gearing in Setup A and the setup you are considering in Setup B. Everything updates as you type.

Start from a bike's stock gearing

Pick a bike to fill both setups with its stock sprockets.

Front sprockets 8–16 teeth, rear 34–60. Values outside that range are brought back to the nearest limit.

Setup A — what you run now

Front teeth

Rear teeth

Setup B — what you are thinking about

Front teeth

Rear teeth

Final drive ratio

— — : 1

—

Pull at the wheel—

Top speed—

Ratio change—

A —

B —

Taller · more speed Shorter · more pull

—

Changing the rear sprocket changes the chain length too. The chain length calculator works it out from the chain you have now, with where the axle ends up.

Ratios are exact. The chain figure is an estimate of roughly one link per two teeth of change — confirm against your manual before ordering.

What's missing

12 of 29 fields read off a manual page.

Not yet verified (12): chain links, front rim, rear rim, fork spring rate, shock spring rate, static sag, race sag, fork oil, brake fluid, fuel octane, idle speed, valve clearance.

From a spec sheet, awaiting a manual page (5): front sprocket, rear sprocket, fork, seat height, weight.

See coverage for every bike

Sources

1
American Honda 2025 CRF125F specifications (preliminary)Manufacturer web or spec sheet, research level. Covers stock front sprocket, stock rear sprocket, fork, seat height, weight; checked 2026-09-25.
2
Honda 2025 CRF125F/CRF125F Big Wheel Owner's Manual (31K28D10); owner-supplied copy of Honda's PDFpp. 108, 148, 149, 150, 151Manual page, verified. Covers chain pitch, stock final drive ratio, front tire, rear tire, fork travel, shock travel, engine oil spec, engine oil capacity, fuel capacity, tire pressure (off-road), chain slack, spark plug and gap, wheelbase; checked 2026-09-26.

Always confirm against the manual for your exact year before ordering parts or setting up suspension. Torque specs are deliberately not published here. How we verify a value.

Your manual prints something different? Report a value with the page it is on; every fix is listed in the corrections log.

My settings

Date / track
Sprockets run
Race sag / free sag
Fork air pressure or spring
Fork clickers (compression / rebound)
Shock clickers (low / high / rebound)
Tire pressures (front / rear)
Notes

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