Built around Yamaha's cross - motocross motorcycle platform, the 2017 Yamaha YZ85LW features a 85 cc (5.2 cu in) liquid-cooled single cylinder, two-stroke configuration. 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 YZ85LW measures 73 kg (161 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 904 mm (35.6 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,286 mm (50.6 in) wheelbase engineered for quick, flickable steering geometry. The 5-liter (1.3 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Yamaha archive, this model family spans 11 indexed model years from 2009 to 2026, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
904 mm (35.6 in)
Engine
Displacement85.0 ccm (5.19 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsReed valve
Compression8.2:1
Bore x Stroke47.5 x 47.8 mm (1.9 x 1.9 inches)
Fuel SystemCarburettor. Keihin PWK 28
IgnitionCDI
LubricationPremix
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
DrivelineConstant mesh
Chassis
Frame TypeAluminium. Semi double cradle.
Rake27.0°
Trail106 mm (4.2 inches)
Front SuspensionUpside-down telescopic fork
Front Travel274 mm (10.8 inches)
Rear SuspensionSwingarm (link suspension)
Rear Travel282 mm (11.1 inches)
Wheelbase1286 mm (50.6 inches)
Ground Clearance393 mm (15.5 inches)
Wheels & Brakes
Front Tyre70/100-19
Rear Tyre90/100-16
Front BrakesSingle disc
Front Brake Ø220 mm (8.7 inches)
Rear BrakesSingle disc
Rear Brake Ø190 mm (7.5 inches)
WheelsWire spoked
Dimensions & Weight
Weight incl.73.0 kg (160.9 pounds)
Seat Height904 mm (35.6 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.
