Motocross Bikes

2004Yamaha YZ 85 LW

30 fields on record

The 2004 Yamaha YZ 85 LW is an entry-level motocross bike designed for young riders transitioning from 65cc models. Its lightweight 69kg frame and low 904mm seat height make it accessible for smaller competitors, while the liquid-cooled 84.7cc engine delivers reliable power for learning and developing skills on the track.

Capacity: 84.7 ccm
Engine: Single single, two-stroke
Gearbox: Not on record
Know it? Add it →
Dry weight: 69.0 kg
Seat height: 904 mm
Power: Not on record
Know it? Add it →

⇄ Compare with another bike All model years

What’s new for the 2004 Yamaha YZ 85 LW

vs the 2003

Spec	2003	2004
Engine capacity	84.70 ccm (5.17 cubic inches)	84.7 ccm (5.17 cubic inches)
Power	15.0 HP (estimated - EU/UK A1-licence power-restricted range, ~11kW cap)	not listed
Seat height	902 mm (35.5 inches)	904 mm (35.6 inches)
Front suspension	—	Telescopic fork
Rear suspension	—	Swinging arm (monocross)
Wheelbase	1,278 mm (50.3 inches)	1255 mm (49.4 inches)

Other years 2002 2003 2004 2005 2006

How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail90%

Cornering80%

City riding5%

Daily riding5%

Touring5%

Two-up0%

Track70%

Best for: Built purely for motocross racing on closed off-road tracks, note this is the larger-wheel (LW) variant aimed at bigger junior riders stepping up before a full-size bike.
Built for: A high-revving, agile, purpose-built racer that rewards aggressive, committed riding and rapid direction changes over jumps and berms.
Not ideal for: This is not suitable for road use, commuting, touring, carrying a passenger, or riders looking for a comfortable, low-maintenance everyday machine.

Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.

Will it fit you?

Worked out in your browser - nothing is sent to us

Your height

Inseam (optional)

Units

At 904mm, a rider of 68.9" with a 31" (estimated) inseam will not reach the ground comfortably on the 2004 Yamaha YZ 85 LW, with a cramped knee angle of around 80 degrees and an upright riding position.

Assumes about 30mm of suspension sag once seated. This is an approximation from category-typical geometry, not a measurement of this bike or of you - sit on one before you buy.

More bikes at over 900 mm — Sky High →

Find bikes that fit your height →

Full specifications

Engine

Capacity: 84.7 ccm
Engine type: Single single, two-stroke
Bore x stroke: 47.5 x 47.8 mm
Compression: 8.2:1
Cooling system: Liquid
Fuel system: Carburettor
Starting: Kick
Valves per cylinder: 5
Power: Not on record - add it

Transmission

Transmission type: Manual
Final drive: Chain
Clutch: Wet, multiple-disc coil spring

Dimensions & weight

Wheelbase: 1255 mm
Overall length: 1903 mm
Overall width: 758 mm
Overall height: 1205 mm
Seat height: 904 mm
Dry weight: 69.0 kg
Ground clearance: 393 mm

Chassis & suspension

Front suspension: Telescopic fork
Rear suspension: Swinging arm (monocross)
Front wheel travel: 275 mm
Rear wheel travel: 287 mm

Brakes & wheels

Front brakes: Single disc
Front brakes diameter: 220 mm
Rear brakes: Single disc
Rear brakes diameter: 146 mm
Front tyre: 70/100-19
Rear tyre: 90/100-16

Other

Color options: Blue

Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.

What changed, year to year

Differences highlighted

Specification	2002	2003	2004	2005	2006
Capacity	84.70 ccm (5.17 cubic inches)	84.70 ccm (5.17 cubic inches)	84.70 ccm (5.17 cubic inches)	84.70 ccm (5.17 cubic inches)	84.70 ccm (5.17 cubic inches)
Dry weight	69.0 kg (152.1 pounds)	69.0 kg (152.1 pounds)	69.0 kg (152.1 pounds)	69.0 kg (152.1 pounds)	66.0 kg (145.5 pounds)
Seat height	902 mm (35.5 inches)	902 mm (35.5 inches)	904 mm (35.6 inches)	904 mm (35.6 inches)	864 mm (34.0 inches)
Fuel capacity	—	—	—	—	8.00 litres (2.11 gallons)
Color options	—	—	Blue	Blue	—