2019 Yamaha YZ85 (2-Stroke)

Conquer Dirt

Redesigned from the ground up, the new YZ85 has been built to dominate the 85 cc class. Featuring a new engine with the Yamaha Power Valve System (YPVS), new suspension, revised six-speed transmission and adjustable ergonomics, the 2019 YZ85 is ready to win races straight off the dealership floor.

CHASSIS

A new front fork, new swingarm, new wave-style brake rotors and adjustable ergonomics complement the YZ85's semi-double-cradle, single-backbone steel frame and fully adjustable suspension.

• Potent, easy-to-service two-stroke engine
• Broad, tractable power across the rev range
• Smooth-shifting, six-speed, close-ratio transmission
• Compact, semi-double-cradle, single-backbone steel frame
• Race-ready, fully adjustable suspension
• Aggressive YZ styling

• Lightweight, compact, 85cc, liquid-cooled, crankcase reed-valve inducted, 2-stroke single.
• Yamaha Power Valve System (YPVS).
  • Mechanical power valve system delivers effective exhaust timing throughout the entire rev range
  • Provides excellent power and torque characteristics
  • Boosts compression ratio and power output
  • Delivers responsive acceleration just as the rider intends
  • Slit-shaped valve on the side of the exhaust port operates in response to engine rpm
  • In low-to-mid-rpm range when exhaust timing is slower, valve moves to cover the top part of the exhaust port
  • In high rpm range when quick exhaust timing is needed, valve recedes and exhaust port is fully uncovered
  • Shifting is reduced due to broader powerband
• Crankcase reed valve induction and 28 mm Keihin flat-slide carburetor.
  • crisp, seamless throttle response across the powerband
  • new design features spacer-style reed valve intake for improved gas flow
  • Carburetor settings optimized for updated engine
• Lightweight, forged piston.
  • less reciprocating mass and less friction for a faster revving engine
  • excellent durability
• CDI ignition system.
  • provides a hot, precise spark for fast sure starts
  • provides optimal timing for quicker, stronger response at all rpms
  • maintenance-free
• Smooth-shifting, six-speed transmission.
  • involute design increases the surface area contact between the gears
  • special involute splines on main and drive shafts provide maximum engagement / hook-up for each gear for smoother, more positive shifts
  • gear ratios are well matched to engine output
  • Gear dimensions optimized for 2019 based on YPVS engine performance
• Heavy-duty, multi-plate clutch.
  • smooth positive shifting
• Quick-remove, clutch sub-cover.
  • fast, easy clutch access
• Lightweight radiator with high-capacity cores and special louvers to direct the air through the rad.
  • maximum cooling efficiency
• Large-capacity airbox with washable, dual-stage, foam filter.
  • excellent filtering qualities
  • reduced expenses
• Lightweight exhaust system.
  • revised expansion chamber matches the improved output of YPVS engine
  • aluminium silencer is re-packable to maintain optimum performance and reduced noise levels