Motocross

Yamaha YZ250F 2019

Motocross, 250cc 4T, US version

Partly verified

Illustration: a Yamaha motocross bike, not this exact model.

From the owner’s manual: engine oil capacity 0.73 L (0.77 US qt), p. 2-2; coolant 0.93 L (0.98 US qt), p. 2-2; front tire 80/100-21 51M, p. 2-5; rear tire 100/90-19 57M, p. 2-5. Checked 16 Oct 2026.

No CPSC recall found for the 2019 Yamaha YZ250F, checked 2026-10-15. Recalls

Yamaha YZ250F 2019

Workshop card from motoxsports.com/bikes/yamaha-yz250f-2019/ · each figure as the maker’s document prints it, with its source number; ≈ marks a figure we converted. Torque values are not published: use the manual.

Gearing

4 of 5 filled

Stock front sprocket: 13T; Verified, read off the manual page: Manual p. 2-4 · checked 2026-10-14 source [1]
Stock rear sprocket: 50T; Verified, read off the manual page: Manual p. 2-4 · checked 2026-10-14 source [1]
Chain pitch: Not yet verified
Stock chain links: 114; Verified, read off the manual page: Manual p. 2-7 · checked 2026-10-14 source [1]
Stock final drive ratio: 3.846 : 1; Verified, read off the manual page: Manual p. 2-4 · checked 2026-10-14 source [1]

Wheels and tires

4 of 4 filled

Front rim: 21x1.6; Verified, read off the manual page: Manual p. 2-5 · checked 2026-10-14 source [1]
Rear rim: 19x1.85; Verified, read off the manual page: Manual p. 2-5 · checked 2026-10-14 source [1]
Front tire: 80/100-21 51M; Verified, read off the manual page: Manual p. 2-5 · checked 2026-10-14 source [1]
Rear tire: 100/90-19 57M; Verified, read off the manual page: Manual p. 2-5 · checked 2026-10-14 source [1]

Suspension

2 of 7 filled

Fork: Telescopic fork; Verified, read off the manual page: Manual p. 2-6 · checked 2026-10-14 source [1]
Fork travel: 310 mm (12.2 in); Verified, read off the manual page: Manual p. 2-6 · checked 2026-10-14 source [1]
Shock travel: Not yet verified
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

5 of 5 filled

Engine oil spec: SAE 10W-40, 10W-50, 15W-40, 20W-40 or 20W-50; API service SG type or higher, JASO standard MA; Verified, read off the manual page: Manual p. 2-2 · checked 2026-10-14 source [1]
Engine oil capacity (oil change): 0.73 L (0.77 US qt); Verified, read off the manual page: Manual p. 2-2 · checked 2026-10-14 source [1]
Engine oil capacity, with filter change: 0.75 L (0.79 US qt); Verified, read off the manual page: Manual p. 2-2 · checked 2026-10-16 source [1]
Coolant capacity: 0.93 L (0.98 US qt); Verified, read off the manual page: Manual p. 2-2 · checked 2026-10-14 source [1]
Fuel capacity: 6.2 L (1.6 US gal); Verified, read off the manual page: Manual p. 2-2 · checked 2026-10-14 source [1]

Service specs

4 of 6 filled

Fork oil: Yamaha Suspension Oil S1; Quantity (left) 491.0 cm³ (16.60 US oz, 17.32 Imp.oz); Quantity (right) 491.0 cm³ (16.60 US oz, 17.32 Imp.oz); Verified, read off the manual page: Manual p. 2-6 · checked 2026-10-16 source [1]
Brake fluid: DOT 4; Verified, read off the manual page: Manual p. 2-5 · checked 2026-10-16 source [1]
Coolant type: Not yet verified
Fuel octane: Not yet verified
Idle speed: 1900–2100 r/min; Verified, read off the manual page: Manual p. 2-4 · checked 2026-10-16 source [1]
Valve clearance: Intake 0.12–0.19 mm (0.0047–0.0075 in); Exhaust 0.17–0.24 mm (0.0067–0.0094 in), cold; Verified, read off the manual page: Manual p. 2-3 · checked 2026-10-16 source [1]

Maintenance

3 of 3 filled

Tire pressure (off-road): 100 kPa (1.00 kgf/cm², 15 psi) front and rear, measured on cold tires; Verified, read off the manual page: Manual p. 2-5 · checked 2026-10-14 source [1]
Chain slack: 50.0–60.0 mm (1.97–2.36 in), on a maintenance stand; Verified, read off the manual page: Manual p. 2-7 · checked 2026-10-14 source [1]
Spark plug and gap: NGK/LMAR9E-J, gap 0.6–0.7 mm (0.024–0.028 in); Verified, read off the manual page: Manual p. 2-2 · checked 2026-10-14 source [1]

Dimensions

3 of 3 filled

Seat height: 970 mm (38.19 in); Verified, read off the manual page: Manual p. 2-1 · checked 2026-10-14 source [1]
Wheelbase: 1475 mm (58.1 in); Verified, read off the manual page: Manual p. 2-1 · checked 2026-10-14 source [1]
Weight (curb weight): 106 kg (234 lb); Verified, read off the manual page: Manual p. 2-1 · checked 2026-10-14 source [1]

Solid marks are owner's-manual pages; hollow marks are manufacturer web or spec-sheet figures still waiting on a manual page. Last reviewed 2026-10-16. 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: Stock chain links 114 Owner's manual p. 2-7
Sprockets: Stock front sprocket 13T Owner's manual p. 2-4Stock rear sprocket 50T Owner's manual p. 2-413T front sprockets at MotoSport 50T rear sprockets at MotoSport
Tires: Front tire 80/100-21 51M Owner's manual p. 2-5Rear tire 100/90-19 57M Owner's manual p. 2-5Front tires 80/100-21 at MotoSport Tubes 80/100-21 at MotoSport Rear tires 100/90-19 at MotoSport Tubes 100/90-19 at MotoSport
Engine oil: Engine oil spec SAE 10W-40, 10W-50, 15W-40, 20W-40 or 20W-50; API service SG type or higher, JASO standard MA Owner's manual p. 2-2Engine oil capacity (oil change) 730 ml (24.7 fl oz) Owner's manual p. 2-2Engine oil at MotoSport
Coolant: Coolant capacity 930 ml (31.4 fl oz) Owner's manual p. 2-2Coolant at MotoSport

In stock at MotoSport

Prices from MotoSport’s catalog of Oct 14, 2026; check today’s price before you buy.

Front tire, stock size 80/100-21

Rear tire, stock size 100/90-19

Engine oil, stock viscosity 10W-40

Matched on viscosity only. The manual prints: SAE 10W-40, 10W-50, 15W-40, 20W-40 or 20W-50; API service SG type or higher, JASO standard MA. Check the label for the rest.

Spark plug, stock NGK/LMAR9E-J

NGKSpark Plug - LMAR9E-J$17.96 ~~was $23.95~~ SaleBuy at MotoSport

Prices and stock from MotoSport's product catalog on Oct 14, 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: Yamaha YZ250F 2027.

Other model years

All 9 model years, 2019 to 2027, side by side

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

23 of 31 fields read off a manual page.

Not yet verified (8): chain pitch, shock travel, fork spring rate, shock spring rate, static sag, race sag, coolant type, fuel octane.

See coverage for every bike

Sources

1
Yamaha 2019 YZ250F Owner's Service Manual, LIT-11626-32-16, B7B-28199-10 (Yamaha Owner's Manual Library, USA)pp. 2-1, 2-2, 2-3, 2-4, 2-5, 2-6, 2-7Manual page, verified. Covers stock front sprocket, stock rear sprocket, stock final drive ratio, stock chain links, front tire, rear tire, front rim, rear rim, fork, fork travel, engine oil spec, engine oil capacity (oil change), coolant capacity, fuel capacity, tire pressure (off-road), spark plug and gap, chain slack, seat height, wheelbase, weight (curb weight), engine oil figure, as labelled, engine oil capacity, with filter change, weight, as labelled, fork oil, brake fluid, idle speed, valve clearance; checked 2026-10-16.

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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