The Garage

Motocross

Stock-size parts in stock at MotoSport

Yamaha YZ450F 2023

Motocross, 450cc 4T, US version

Verified

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

From the owner’s manual: engine oil capacity 0.94 L (0.99 US qt), p. 2-2; coolant 1.03 L (1.09 US qt), p. 2-2; front tire 80/100-21 51M, p. 2-5; rear tire 120/80-19 63M, p. 2-5. Checked 26 Sep 2026.

No CPSC recall found for the 2023 Yamaha YZ450F, checked 2026-10-15. Recalls

Spec card PDF

Gearing

5 of 5 filled

Stock front sprocket
13T
Verified, read off the manual page: Manual p. 2-4 · checked 2026-09-26 source [1]
Stock rear sprocket
49T
Verified, read off the manual page: Manual p. 2-4 · checked 2026-09-26 source [1]
Chain pitch
520
Verified, read off the manual page: Manual p. 2-7 · checked 2026-09-26 source [1]
Stock chain links
114
Verified, read off the manual page: Manual p. 2-7 · checked 2026-09-26 source [1]
Stock final drive ratio
3.769 : 1
Verified, read off the manual page: Manual p. 2-4 · checked 2026-09-26 source [1]

Wheels and tires

4 of 4 filled

Front rim
21x1.6
Verified, read off the manual page: Manual p. 2-5 · checked 2026-09-26 source [1]
Rear rim
19x2.15
Verified, read off the manual page: Manual p. 2-5 · checked 2026-09-26 source [1]
Front tire
80/100-21 51M
Verified, read off the manual page: Manual p. 2-5 · checked 2026-09-26 source [1]
Rear tire
120/80-19 63M
Verified, read off the manual page: Manual p. 2-5 · checked 2026-09-26 source [1]

Suspension

5 of 7 filled

Fork
Telescopic fork
Verified, read off the manual page: Manual p. 2-5 · checked 2026-09-26 source [1]
Fork travel
310 mm (12.2 in)
Verified, read off the manual page: Manual p. 2-6 · checked 2026-09-26 source [1]
Shock travel
315 mm (12.4 in)
Verified, read off the manual page: Manual p. 2-6 · checked 2026-09-26 source [1]
Stock fork spring rate
5 N/mm
Verified, read off the manual page: Manual p. 10-3 · checked 2026-09-26 source [1]
Stock shock spring rate
58 N/mm
Verified, read off the manual page: Manual p. 10-4 · checked 2026-09-26 source [1]
Static sag, bike only
Not yet verified
Race sag, rider on
Not yet verified

Fluids and capacities

4 of 4 filled

Engine oil spec
SAE 10W-40 (or 10W-50, 15W-40, 20W-40, 20W-50), API SG or higher, JASO MA
Verified, read off the manual page: Manual p. 2-2 · checked 2026-09-26 source [1]
Engine oil capacity
0.94 L (0.99 US qt)
Verified, read off the manual page: Manual p. 2-2 · checked 2026-09-26 source [1]
Coolant capacity
1.03 L (1.09 US qt)
Verified, read off the manual page: Manual p. 2-2 · checked 2026-09-26 source [1]
Fuel capacity
6.2 L (1.6 US gal)
Verified, read off the manual page: Manual p. 2-2 · checked 2026-09-26 source [1]

Maintenance

3 of 3 filled

Tire pressure (off-road)
100 kPa (15 psi) front and rear
Verified, read off the manual page: Manual p. 2-5 · checked 2026-09-26 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 2026-09-26 source [1]
Spark plug and gap
NGK LMAR8G, gap 0.7-0.8 mm
Verified, read off the manual page: Manual p. 2-2 · checked 2026-09-26 source [1]

Dimensions

3 of 3 filled

Seat height
965 mm (38.0 in)
Verified, read off the manual page: Manual p. 2-1 · checked 2026-09-26 source [1]
Wheelbase
1480 mm (58.3 in)
Verified, read off the manual page: Manual p. 2-1 · checked 2026-09-26 source [1]
Weight
109 kg (240 lb)
Verified, read off the manual page: Manual p. 2-1 · checked 2026-09-26 source [1]

Service specs

0 of 6 filled

Fork oil, brake fluid, coolant type, 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 520 Owner's manual p. 2-7Stock chain links 114 Owner's manual p. 2-7520 chains at MotoSport520 master links at MotoSport
Sprockets
Stock front sprocket 13T Owner's manual p. 2-4Stock rear sprocket 49T Owner's manual p. 2-413T front sprockets at MotoSport49T rear sprockets at MotoSport
Tires
Front tire 80/100-21 51M Owner's manual p. 2-5Rear tire 120/80-19 63M Owner's manual p. 2-5Front tires 80/100-21 at MotoSportTubes 80/100-21 at MotoSportRear tires 120/80-19 at MotoSportTubes 120/80-19 at MotoSport
Engine oil
Engine oil spec SAE 10W-40 (or 10W-50, 15W-40, 20W-40, 20W-50), API SG or higher, JASO MA Owner's manual p. 2-2Engine oil capacity 940 ml (31.8 fl oz) Owner's manual p. 2-2Engine oil at MotoSport
Coolant
Coolant capacity 1030 ml (34.8 fl oz) Owner's manual p. 2-2Coolant at MotoSport
Suspension springs
Stock fork spring rate 5 N/mm Owner's manual p. 10-3Stock shock spring rate 58 N/mm Owner's manual p. 10-4Suspension 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 80/100-21

Rear tire, stock size 120/80-19

Chain, stock pitch 520, stock length 114 links

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

Engine oil, stock viscosity 10W-40

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

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.

Tools for this bike

Compare with

Comparisons with other bikes use the newest model year on file: Yamaha YZ450F 2027.

Other model years

All 7 model years, 2021 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.

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
Setup B — what you are thinking about
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): static sag, race sag, fork oil, brake fluid, coolant type, fuel octane, idle speed, valve clearance.

See coverage for every bike

Sources

  1. 1
    Yamaha 2023 YZ450F Owner's Service Manual, BHR-2819U-10 (LIT-11626-36-32); owner-supplied copy of Yamaha's PDFpp. 2-1, 2-2, 2-4, 2-5, 2-6, 2-7, 10-3, 10-4Manual page, verified. Covers stock front sprocket, stock rear sprocket, stock final drive ratio, chain pitch, stock chain links, front rim, rear rim, front tire, rear tire, fork, fork travel, shock travel, stock fork spring rate, stock shock spring rate, engine oil spec, engine oil capacity, coolant capacity, fuel capacity, tire pressure (off-road), chain slack, spark plug and gap, seat height, wheelbase, weight; 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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