Yamaha YZ85 - 2012 Specifications and Reviews

The 2012 Yamaha YZ85 is a lightweight 85cc two-stroke motocross bike engineered for young and intermediate riders transitioning to competitive off-road racing. Its liquid-cooled single-cylinder engine delivers punchy power delivery characteristic of reed-valve two-strokes, while the responsive six-speed gearbox and nimble semi-double-cradle frame provide excellent maneuverability on technical terrain. Best known for reliability and forgiving handling, the YZ85 remains a popular choice in youth motocross championships.

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General information

CategoryCross / motocross
Year2012
ModelYamaha YZ85

Engine and Transmission Specifications

Transmission type,final driveChain
Gearbox6-speed
Cooling systemLiquid
Lubrication systemWet sump
IgnitionCDI
Fuel systemCarburettor. Keihin PWK 28
Bore x stroke47.5 x 47.8 mm (1.9 x 1.9 inches)
Compression8.2:1
Engine detailsReed-valve inducted
Engine typeSingle cylinder, two-stroke
Capacity:85.00 ccm (5.19 cubic inches)

Brakes, suspension, Frame and wheels

Rear brakes diameter190 mm (7.5 inches)
Rear brakesSingle disc. Hydraulic
Front brakes diameter220 mm (8.7 inches)
Front brakesSingle disc. Hydraulic
Rear tyre dimensions90/100-14
Front tyre dimensions70/100-17
Rear suspension travel282 mm (11.1 inches)
Rear suspensionSingle shock
Front suspension travel274 mm (10.8 inches)
Front suspensionInverted fork
Frame typeSingle-backbone, semi-double-cradle frame
 
 

Physical measures and capacities

Fuel capacity4.92 litres (1.30 gallons)
Wheelbase1,257 mm (49.5 inches)
Ground clearance351 mm (13.8 inches)
Overall width757 mm (29.8 inches)
Overall length1,821 mm (71.7 inches)
Overall height1,161 mm (45.7 inches)
Seat height864 mm (34.0 inches) If adjustable, lowest setting.
Weight incl. oil, gas, etc71.2 kg (157.0 pounds)

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay
Color optionsBlue/White
Factory warranty30 Days Limited Factory Warranty)

Rider Fit Visualizer

Calculated in your browser only - your height/inseam are never sent to our servers.

Feet:

At 864mm, a rider of 68.9" with a 31" (estimated) inseam will reach the ground with tip-toe one foot on the 2012 Yamaha YZ85, with a cramped knee angle of around 75 degrees and an upright riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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