Engineered by Yamaha for the cross - motocross motorcycle segment, the 2010 Yamaha YZ85 pairs a 84.7 cc (5.2 cu in) liquid-cooled single cylinder, two-stroke architecture with road-focused gearing. Internal engine geometry specifies a bore and stroke of 47.5 x 47.8 mm (1.9 x 1.9 inches) with a 8.2:1 compression ratio.
On the scales, the YZ85 measures 70.8 kg (156 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 864 mm (34 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,257 mm (49.5 in) wheelbase engineered for quick, flickable steering geometry. The 4.92-liter (1.3 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Yamaha archive, this model family spans 19 indexed model years from 2008 to 2026, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
864 mm (34 in)
Engine
Displacement84.7 ccm (5.17 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Compression8.2:1
Bore x Stroke47.5 x 47.8 mm (1.9 x 1.9 inches)
Fuel SystemCarburettor. Keihin® PWK 28
IgnitionCDI
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
Chassis
Front SuspensionInverted fork
Front Travel274 mm (10.8 inches)
Rear SuspensionSingle shock
Rear Travel282 mm (11.1 inches)
Wheelbase1257 mm (49.5 inches)
Ground Clearance351 mm (13.8 inches)
Wheels & Brakes
Front Tyre70/100-M17
Rear Tyre90/90-M14
Front BrakesSingle disc
Front Brake Ø220 mm (8.7 inches)
Rear BrakesSingle disc
Rear Brake Ø190 mm (7.5 inches)
Dimensions & Weight
Weight incl.70.8 kg (156.0 pounds)
Seat Height864 mm (34.0 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
