Engineered by Yamaha for the cross - motocross motorcycle segment, the 2018 Yamaha YZ85 relies on a 85 cc (5.2 cu in) liquid-cooled single cylinder, two-stroke powerplant. 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 71.2 kg (157 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 841 mm (33.1 in) seat height — resulting in a taller command-style riding posture suited to medium-to-tall inseams, 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
841 mm (33.1 in)
Engine
Displacement85.0 ccm (5.19 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsReed-valve-inducted
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)
ClutchWet multi-disc
Chassis
Frame TypeSemi-double-cradle frame
Rake28.0°
Front SuspensionInverted fork
Front Travel274 mm (10.8 inches)
Rear SuspensionSingle shock
Rear Travel282 mm (11.1 inches)
Wheelbase1257 mm (49.5 inches)
Ground Clearance330 mm (13.0 inches)
Wheels & Brakes
Front Tyre70/100-17
Rear Tyre90/100-14
Front BrakesSingle disc. Hydraulic.
Front Brake Ø220 mm (8.7 inches)
Rear BrakesSingle disc. Hydraulic.
Rear Brake Ø190 mm (7.5 inches)
WheelsDunlop tyres
Dimensions & Weight
Weight incl.71.2 kg (157.0 pounds)
Seat Height841 mm (33.1 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.
