Motocross

Yamaha YZ85

Motocross, 85cc 2T, 2027, US version

Partly verified

Gearing

0 of 5 filled

Stock front sprocket: Not yet verified
Stock rear sprocket: Not yet verified
Chain pitch: Not yet verified
Stock chain links: Not yet verified
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: 70/100-17 40M; Owner's manual p. 9-1, checked 2026-09-28 (source 1)
Rear tire: 90/100-14 49M; Owner's manual p. 9-1, checked 2026-09-28 (source 1)

Suspension

3 of 7 filled

Fork: Telescopic fork; Owner's manual p. 9-2, checked 2026-09-28 (source 1)
Fork travel: 274 mm (10.8 in); Manufacturer spec sheet (research), checked 2026-09-27 (source 2)
Shock travel: 282 mm (11.1 in); Manufacturer spec sheet (research), checked 2026-09-27 (source 2)
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: 550 ml (18.6 fl oz); Owner's manual p. 9-1, checked 2026-09-28 (source 1)
Premix ratio: 30:1; Owner's manual p. 4-4, checked 2026-09-28 (source 1)
Fuel capacity: 5 L (1.32 gal); Owner's manual p. 9-1, checked 2026-09-28 (source 1)

Maintenance

2 of 3 filled

Tire pressure (off-road): 100 kPa (15 psi) front and rear; Owner's manual p. 7-14, checked 2026-09-28 (source 1)
Chain slack: 58-68 mm (2.28-2.68 in); Owner's manual p. 7-20, checked 2026-09-28 (source 1)
Spark plug and gap: Not yet verified

Dimensions

3 of 3 filled

Seat height: 840 mm (33.1 in); Owner's manual p. 9-1, checked 2026-09-28 (source 1)
Wheelbase: 1255 mm (49.4 in); Owner's manual p. 9-1, checked 2026-09-28 (source 1)
Weight: 73 kg (161 lb); Owner's manual p. 9-1, 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 2026-09-28. Rows marked not yet verified are blank on purpose.

What's missing

11 of 24 fields read off a manual page.

Not yet verified (11): front sprocket, rear sprocket, chain pitch, chain links, front rim, rear rim, fork spring rate, shock spring rate, static sag, race sag, spark plug and gap.

From a spec sheet, awaiting a manual page (2): fork travel, shock travel.

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Use this bike

Tools for this bike

Tire sizes

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Buying parts

The stock sizes and specs this bike left the factory with, each with its source. Take them to any shop. Retailer links will appear here once a store approves MotoXSports.

Tires: Front tire 70/100-17 40M Owner's manual p. 9-1Rear tire 90/100-14 49M Owner's manual p. 9-1
Coolant: Coolant capacity 550 ml (18.6 fl oz) Owner's manual p. 9-1

6 part specs not yet verified; see data coverage.

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

Sources

1
Yamaha 2027 YZ85 Owner's Manual, DA8-28199-80; owner-supplied copy from Yamaha's Owner's Manual Librarypp. 4-4, 7-14, 7-20, 9-1, 9-2Manual page, verified. Covers front tire, rear tire, fork, coolant capacity, fuel capacity, premix ratio, tire pressure (off-road), chain slack, seat height, wheelbase, weight; checked 2026-09-28.
2
Yamaha 2027 YZ85 specifications (yamahamotorsports.com)Manufacturer web or spec sheet, research level. Covers fork travel, shock travel; checked 2026-09-27.

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.

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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