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
The lightweight 36 mm KYB inverted cartridge fork features 10.8 inches of travel with compression and rebound damping adjustability complete with low-friction outer tubes and internals. Damping settings offer enhanced performance across a range of conditions and rider abilities.

• Yamaha Power Valve System (YPVS) for broad, tractable power
• Potent, easy-to-service two-stroke engine
• Smooth-shifting, six-speed, close-ratio transmission
• Compact, semi-double-cradle, single-backbone steel frame
• Race-ready, fully adjustable suspension
• Aggressive YZ styling
• Adjustable rider ergonomics
• High-spec wheels and brakes

• 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