2027 Honda CRF450R seen from the right side on a white background — 2027 Honda CRF450R. Photo: American Honda.

Motocross

Honda CRF450R 2027

Motocross, 450cc 4T

Partly verified

From the owner’s manual: engine oil capacity 1.07 L, p. 74; coolant 1.08 L, p. 74; front tire 80/100-21 51M, p. 73; rear tire 120/90-19 66M, p. 73. Checked 16 Oct 2026.

No CPSC recall found for the 2027 Honda CRF450R, checked 2026-10-15. Recalls

Spec card PDF

Gearing

4 of 5 filled

Stock front sprocket: 13T; Research level: Spec sheet (research) · checked 2026-09-28 source [1]
Stock rear sprocket: 51T; Research level: Spec sheet (research) · checked 2026-09-28 source [1]
Chain pitch: 520; Research level: Spec sheet (research) · checked 2026-09-28 source [1]
Stock chain links: Not yet verified
Stock final drive ratio: 3.923 : 1; Verified, read off the manual page: Manual p. 74 · checked 2026-09-28 source [2]

Wheels and tires

2 of 4 filled

Front rim: Not yet verified
Rear rim: Not yet verified
Front tire: 80/100-21 51M; Verified, read off the manual page: Manual p. 73 · checked 2026-09-28 source [2]
Rear tire: 120/90-19 66M; Verified, read off the manual page: Manual p. 73 · checked 2026-09-28 source [2]

Suspension

3 of 7 filled

Fork: 49mm inverted Showa fork; Research level: Spec sheet (research) · checked 2026-09-28 source [1]
Fork travel: 12.2-inch (≈ 310 mm, converted by MotoXSports); Research level: Spec sheet (research) · converted from 12.2-inch · checked 2026-09-28 source [1]
Shock travel: 12.0-inch (≈ 305 mm, converted by MotoXSports); Research level: Spec sheet (research) · converted from 12.0-inch · checked 2026-09-28 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

5 of 5 filled

Engine oil spec: SAE 10W-30, JASO T 903 MA; Verified, read off the manual page: Manual p. 74 · checked 2026-09-28 source [2]
Engine oil capacity (after draining): 1.07 L (≈ 36.2 fl oz, converted by MotoXSports); Verified, read off the manual page: Manual p. 74 · checked 2026-09-28 source [2]
Engine oil capacity, with filter change: 1.10 L (≈ 37.2 fl oz, converted by MotoXSports); Verified, read off the manual page: Manual p. 74 · checked 2026-10-16 source [2]
Coolant capacity: 1.08 L (≈ 36.5 fl oz, converted by MotoXSports); Verified, read off the manual page: Manual p. 74 · checked 2026-09-28 source [2]
Fuel capacity: 7.1 L (≈ 1.88 gal, converted by MotoXSports); Verified, read off the manual page: Manual p. 73 · checked 2026-09-28 source [2]

Service specs

4 of 6 filled

Fork oil: Not yet verified
Brake fluid: Not yet verified
Coolant type: Pro Honda HP Coolant; Verified, read off the manual page: Manual p. 74 · checked 2026-10-16 source [2]
Fuel octane: Unleaded gasoline 91 PON or higher; Verified, read off the manual page: Manual p. 73 · checked 2026-10-16 source [2]
Idle speed: 2,000 ± 100 rpm; Verified, read off the manual page: Manual p. 74 · checked 2026-10-16 source [2]
Valve clearance: Intake 0.005 ± 0.001 in (0.13 ± 0.03 mm); Exhaust 0.009 ± 0.001 in (0.24 ± 0.03 mm), cold; Verified, read off the manual page: Manual p. 74 · checked 2026-10-16 source [2]

Maintenance

2 of 3 filled

Tire pressure (off-road): 15 psi (100 kPa) front and rear; Verified, read off the manual page: Manual p. 73 · checked 2026-09-28 source [2]
Chain slack: Not yet verified
Spark plug and gap: NGK SILMAR9A-9S, gap 0.80-0.90 mm; Verified, read off the manual page: Manual p. 75 · checked 2026-09-28 source [2]

Dimensions

3 of 3 filled

Seat height: 953 mm (≈ 37.5 in, converted by MotoXSports); Verified, read off the manual page: Manual p. 73 · checked 2026-09-28 source [2]
Wheelbase: 1490 mm (≈ 58.7 in, converted by MotoXSports); Verified, read off the manual page: Manual p. 73 · checked 2026-09-28 source [2]
Weight: 238 pounds (≈ 108 kg, converted by MotoXSports); Research level: Spec sheet (research) · converted from 238 pounds · checked 2026-09-28 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 Manufacturer spec sheet (research)520 chains at MotoSport 520 master links at MotoSport
Sprockets: Stock front sprocket 13T Manufacturer spec sheet (research)Stock rear sprocket 51T Manufacturer spec sheet (research)13T front sprockets at MotoSport 51T rear sprockets at MotoSport
Tires: Front tire 80/100-21 51M Owner's manual p. 73Rear tire 120/90-19 66M Owner's manual p. 73Front tires 80/100-21 at MotoSport Tubes 80/100-21 at MotoSport Rear tires 120/90-19 at MotoSport Tubes 120/90-19 at MotoSport
Engine oil: Engine oil spec SAE 10W-30, JASO T 903 MA Owner's manual p. 74Engine oil capacity (after draining) 1070 ml (36.2 fl oz) Owner's manual p. 74Engine oil at MotoSport
Coolant: Coolant capacity 1080 ml (36.5 fl oz) Owner's manual p. 74Coolant 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 120/90-19

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.

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

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Other model years

All 5 model years, 2023 to 2027, side by side

Service schedule

35 rows from the owner's manual schedule, pp. 36-38, counted in races, at these intervals:

Each race or about 2.5 hours
Every 3 races or about 7.5 hours
Every 6 races or about 15.0 hours
Every 9 races or about 22.5 hours
Every 12 races or about 30.0 hours

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

14 of 31 fields read off a manual page.

Not yet verified (10): chain links, front rim, rear rim, fork spring rate, shock spring rate, static sag, race sag, chain slack, fork oil, brake fluid.

From a spec sheet, awaiting a manual page (7): front sprocket, rear sprocket, chain pitch, fork, fork travel, shock travel, weight.

See coverage for every bike

Sources

1
American Honda 2027 CRF450R specifications (preliminary)Manufacturer web or spec sheet, research level. Covers stock front sprocket, stock rear sprocket, chain pitch, fork, fork travel, shock travel, weight; checked 2026-09-28.
2
Honda 2027 CRF450R/RX/HRC Works Edition Owner's Manual (31MKEA00); owner-supplied copy of Honda's PDFpp. 73, 74, 75Manual page, verified. Covers stock final drive ratio, front tire, rear tire, engine oil spec, engine oil capacity (after draining), coolant capacity, fuel capacity, tire pressure (off-road), spark plug and gap, seat height, wheelbase, engine oil figure, as labelled, engine oil capacity, with filter change, coolant type, fuel octane, 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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