The Garage

Motocross

Stock-size parts in stock at MotoSport

Suzuki RM-Z450 2027

Motocross, 449cc 4T

Partly verified

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

From the owner’s manual: engine oil capacity 1050 ml, p. 6-26; coolant 1100 ml, p. 3-6; front tire 80/100-21 51M, p. 6-40; rear tire 110/90-19 62M, p. 6-40. Checked 28 Sep 2026.

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

No CPSC recall found for the 2027 Suzuki RM-Z450, checked 2026-10-15. Recalls

Spec card PDF

Gearing

2 of 5 filled

Stock front sprocket
Not yet verified
Stock rear sprocket
Not yet verified
Chain pitch
520
Research level: Spec sheet (research) · checked 2026-09-27 source [1]
Stock chain links
114
Research level: Spec sheet (research) · checked 2026-09-27 source [1]
Stock final drive ratio
Not yet verified

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. 6-40 · checked 2026-09-28 source [2]
Rear tire
110/90-19 62M
Verified, read off the manual page: Manual p. 6-40 · checked 2026-09-28 source [2]

Suspension

4 of 7 filled

Fork
Inverted telescopic, coil spring, oil damped, adjustable damping force
Research level: Spec sheet (research) · checked 2026-09-27 source [1]
Fork travel
Not yet verified
Shock travel
Not yet verified
Stock fork spring rate
5 N/mm
Verified, read off the manual page: Manual p. 2-14 · checked 2026-09-28 source [2]
Stock shock spring rate
56 N/mm
Verified, read off the manual page: Manual p. 2-19 · checked 2026-09-28 source [2]
Static sag, bike only
Not yet verified
Race sag, rider on
110 mm (4.33 in)
Verified, read off the manual page: Manual p. 2-20 · checked 2026-09-28 source [2]

Fluids and capacities

4 of 4 filled

Engine oil spec
SAE 10W-40, API SJ/SL/SM/SN, JASO MA
Verified, read off the manual page: Manual p. 3-3 · checked 2026-09-28 source [2]
Engine oil capacity
1050 ml (≈ 35.5 fl oz, converted by MotoXSports)
Verified, read off the manual page: Manual p. 6-26 · checked 2026-09-28 source [2]
Coolant capacity
1100 ml (≈ 37.2 fl oz, converted by MotoXSports)
Verified, read off the manual page: Manual p. 3-6 · checked 2026-09-28 source [2]
Fuel capacity
6.3 L (≈ 1.66 gal, converted by MotoXSports)
Verified, read off the manual page: Manual p. 2-7 · checked 2026-09-28 source [2]

Maintenance

3 of 3 filled

Tire pressure (off-road)
70-110 kPa (10-16 psi) front and rear
Verified, read off the manual page: Manual p. 6-40 · checked 2026-09-28 source [2]
Chain slack
35-45 mm (1.4-1.7 in), rear wheel off the ground
Verified, read off the manual page: Manual p. 6-32 · checked 2026-09-28 source [2]
Spark plug and gap
NGK DIMR8C10, gap 0.9-1.0 mm
Verified, read off the manual page: Manual p. 6-18 · checked 2026-09-28 source [2]

Dimensions

3 of 3 filled

Seat height
960 mm (37.8 in.)
Research level: Spec sheet (research) · checked 2026-09-27 source [1]
Wheelbase
1480 mm (58.3 in.)
Research level: Spec sheet (research) · checked 2026-09-27 source [1]
Weight
112 kg (247 lb.)
Research level: Spec sheet (research) · checked 2026-09-27 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 2026-09-28. 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)Stock chain links 114 Manufacturer spec sheet (research)520 chains at MotoSport520 master links at MotoSport
Tires
Front tire 80/100-21 51M Owner's manual p. 6-40Rear tire 110/90-19 62M Owner's manual p. 6-40Front tires 80/100-21 at MotoSportTubes 80/100-21 at MotoSportRear tires 110/90-19 at MotoSportTubes 110/90-19 at MotoSport
Engine oil
Engine oil spec SAE 10W-40, API SJ/SL/SM/SN, JASO MA Owner's manual p. 3-3Engine oil capacity 1050 ml (35.5 fl oz) Owner's manual p. 6-26Engine oil at MotoSport
Coolant
Coolant capacity 1100 ml (37.2 fl oz) Owner's manual p. 3-6Coolant at MotoSport
Suspension springs
Stock fork spring rate 5 N/mm Owner's manual p. 2-14Stock shock spring rate 56 N/mm Owner's manual p. 2-19Suspension 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 110/90-19

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, API SJ/SL/SM/SN, JASO MA. Check the label for the rest.

Spark plug, stock NGK DIMR8C10

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.

2 part specs not yet verified; see data coverage.

Tools for this bike

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Gearing tool

The calculator prefills from this bike once its stock sprockets are verified. It works with any numbers in the meantime.

Open the gearing calculator

What's missing

12 of 31 fields read off a manual page.

Not yet verified (13): front sprocket, rear sprocket, front rim, rear rim, fork travel, shock travel, static sag, fork oil, brake fluid, coolant type, fuel octane, idle speed, valve clearance.

From a spec sheet, awaiting a manual page (6): chain pitch, chain links, fork, seat height, wheelbase, weight.

See coverage for every bike

Sources

  1. 1
    Suzuki 2027 RM-Z450 specifications (suzukicycles.com)Manufacturer web or spec sheet, research level. Covers chain pitch, stock chain links, fork, seat height, wheelbase, weight; checked 2026-09-27.
  2. 2
    Suzuki RM-Z450 Owner's Manual, 99011-37K56-01A (2027; the manual prints no model year, the owner confirmed it); owner-supplied copy of Suzuki Australia's PDFpp. 2-7, 2-14, 2-19, 2-20, 3-3, 3-6, 6-18, 6-26, 6-32, 6-40Manual page, verified. Covers front tire, rear tire, stock fork spring rate, stock shock spring rate, race sag, rider on, engine oil spec, engine oil capacity, coolant capacity, fuel capacity, tire pressure (off-road), chain slack, spark plug and gap; checked 2026-09-28.

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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