Enduro

Yamaha YZ250X 2027

Enduro, 249cc 2T, US version

Verified

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

From the owner’s manual: premix 30:1, p. 2-2; coolant 1.18 L (1.25 US qt), p. 2-2; front tire 80/100-21 51M, p. 2-5; rear tire 110/100-18 64M, p. 2-5. Checked 16 Oct 2026.

Model year on file: 2027 only. Other years are added as their manuals are read.

No CPSC recall found for the 2027 Yamaha YZ250X, checked 2026-10-15. Recalls

Yamaha YZ250X 2027

Workshop card from motoxsports.com/bikes/yamaha-yz250x/ · 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

5 of 5 filled

Stock front sprocket: 14T; Verified, read off the manual page: Manual p. 2-3 · checked 2026-10-11 source [1]
Stock rear sprocket: 50T; Verified, read off the manual page: Manual p. 2-3 · checked 2026-10-11 source [1]
Chain pitch: 520; Verified, read off the manual page: Manual p. 2-7 · checked 2026-10-11 source [1]
Stock chain links: 114; Verified, read off the manual page: Manual p. 2-7 · checked 2026-10-11 source [1]
Stock final drive ratio: 3.571 : 1; Verified, read off the manual page: Manual p. 2-3 · checked 2026-10-11 source [1]

Wheels and tires

4 of 4 filled

Front rim: 21 x 1.60; Verified, read off the manual page: Manual p. 2-5 · checked 2026-10-11 source [1]
Rear rim: 18 x 2.15; Verified, read off the manual page: Manual p. 2-5 · checked 2026-10-11 source [1]
Front tire: 80/100-21 51M; Verified, read off the manual page: Manual p. 2-5 · checked 2026-10-11 source [1]
Rear tire: 110/100-18 64M; Verified, read off the manual page: Manual p. 2-5 · checked 2026-10-11 source [1]

Suspension

3 of 7 filled

Fork: Telescopic fork; Verified, read off the manual page: Manual p. 2-5 · checked 2026-10-11 source [1]
Fork travel: 300 mm (11.8 in); Verified, read off the manual page: Manual p. 2-6 · checked 2026-10-11 source [1]
Shock travel: 315 mm (12.4 in); Verified, read off the manual page: Manual p. 2-6 · checked 2026-10-11 source [1]
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

Coolant capacity: 1.18 L (1.25 US qt); Verified, read off the manual page: Manual p. 2-2 · checked 2026-10-11 source [1]
Premix ratio: 30:1; Verified, read off the manual page: Manual p. 2-2 · checked 2026-10-11 source [1]
Fuel capacity: 7.0 L (1.8 US gal); Verified, read off the manual page: Manual p. 2-2 · checked 2026-10-11 source [1]

Service specs

4 of 6 filled

Gearbox oil: Motor oil SAE 10W-40 type SG or higher; Quantity (disassembled) 0.80 L (0.85 US qt, 0.70 Imp.qt); Quantity 0.75 L (0.79 US qt, 0.66 Imp.qt); Verified, read off the manual page: Manual p. 2-2 · checked 2026-10-16 source [1]
Fork oil: Yamaha Suspension Oil S1; Quantity (left) 480.0 cm³ (16.23 US oz, 16.93 Imp.oz); Quantity (right) 480.0 cm³ (16.23 US oz, 16.93 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: High quality ethylene glycol antifreeze containing anti-corrosion for aluminum engine; Verified, read off the manual page: Manual p. 3-13 · checked 2026-10-16 source [1]
Fuel octane: Not yet verified
Idle speed: Not yet verified

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 2026-10-11 source [1]
Chain slack: 48.0–58.0 mm (1.89–2.28 in), on a maintenance stand; Verified, read off the manual page: Manual p. 2-7 · checked 2026-10-11 source [1]
Spark plug and gap: NGK/BR8EG, gap 0.5–0.6 mm (0.020–0.024 in); Verified, read off the manual page: Manual p. 2-2 · checked 2026-10-11 source [1]

Dimensions

3 of 3 filled

Seat height: 975 mm (38.4 in); Verified, read off the manual page: Manual p. 2-1 · checked 2026-10-11 source [1]
Wheelbase: 1485 mm (58.5 in); Verified, read off the manual page: Manual p. 2-1 · checked 2026-10-11 source [1]
Weight (curb weight): 104 kg (229 lb); Verified, read off the manual page: Manual p. 2-1 · checked 2026-10-11 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: Chain pitch 520 Owner's manual p. 2-7Stock chain links 114 Owner's manual p. 2-7520 chains at MotoSport 520 master links at MotoSport
Sprockets: Stock front sprocket 14T Owner's manual p. 2-3Stock rear sprocket 50T Owner's manual p. 2-314T front sprockets at MotoSport 50T rear sprockets at MotoSport
Tires: Front tire 80/100-21 51M Owner's manual p. 2-5Rear tire 110/100-18 64M Owner's manual p. 2-5Front tires 80/100-21 at MotoSport Tubes 80/100-21 at MotoSport Rear tires 110/100-18 at MotoSport Tubes 110/100-18 at MotoSport
Coolant: Coolant capacity 1180 ml (39.9 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 110/100-18

Chain, stock pitch 520, stock length 114 links

Chains are sold by link count; this bike's stock chain is 520 pitch, 114 links.

Spark plug, stock NGK/BR8EG

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.

2 part specs not yet verified; see data coverage.

Use this bike

Tools for this bike

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Service schedule

64 rows from the owner's manual schedule, pp. 3-2 to 3-4, counted in races, at these intervals:

After break-in
Every race
Every third race
Every fifth race
As required

Check what's due or track it in My Bike. Buying one used? The hours check lists what the schedule calls for by its meter reading.

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

24 of 30 fields read off a manual page.

Not yet verified (6): fork spring rate, shock spring rate, static sag, race sag, fuel octane, idle speed.

See coverage for every bike

Sources

1
Yamaha 2027 YZ250X Owner's Service Manual, LIT-11626-40-20, DF4-2819U-12 (Yamaha Owner's Manual Library, USA)pp. 2-1, 2-2, 2-3, 2-5, 2-6, 2-7, 3-13Manual page, verified. Covers stock front sprocket, stock rear sprocket, stock final drive ratio, chain pitch, stock chain links, front tire, rear tire, front rim, rear rim, fork, fork travel, shock travel, premix ratio, coolant capacity, fuel capacity, tire pressure (off-road), spark plug and gap, chain slack, seat height, wheelbase, weight (curb weight), weight, as labelled, gearbox oil, fork oil, brake fluid, coolant type; 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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