Yamaha 2019 YZ85 (2 STROKE)

/// NEW FOR 2019

• Yamaha Power Valve System (YPVS)
• New cylinder head and longer connecting rod
• New crankcase design
• New spacer-style reed valve intake
• New optimized expansion chamber
• Revised transmission
• Adjustable rider ergonomics
• New swingarm design
• Upgraded brake line and wave-style rotors
• New Dunlop MX3S tires

/// KEY FEATURES

• 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

/// ENGINE

• 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

/// CHASSIS/SUSPENSION

• Rigid, semi-double cradle, single backbone, steel frame.
  • blend of light weight and good strength
  • minimal flex for razor-sharp, moto-wining handling
• Detachable rear subframe.
  • allows easy access for suspension maintenance
  • reduces costs in the event of a loop-out (subframe can be purchased separately)
• Revised, lightweight box-section aluminium swingarm.
  • composite chain guide and updated chain adjusters provide easier maintenance
  • provides excellent rear-wheel control and traction
• Adjustable 36mm inverted KYB fork with 275 mm (10.8 in) of wheel travel.
  • new low-friction outer tubes and internals are similar to full-size YZ models
  • 20 clicks of both compression and rebound damping
  • adjustable design allows suspension settings to match rider weight, rider style and track conditions
  • YZ125 / 250-based “big bike” valving and low-friction fork seals
  • smooth, compliant stroke for superior suspension performance and handling
  • front fork guard redesigned with brake hose outside of fork guard
• Fully adjustable Monocross link rear suspension provides 282mm (11.1 in) of wheel travel.
  • Kayaba piggyback shock reduces shock temperatures during a long moto for fade resistant damping and consistent performance.
  • adjustments include “threaded” spring preload, 15 clicks of compression and 20 clicks of rebound damping
  • optional shock springs are available through Yamaha Genuine Parts and Accessories
• 220 mm front stainless steel wave front disc with twin-piston caliper.
  • delivers strong stopping power with excellent control and great feedback.
• New tapered aluminum handlebar and adjustable crown.
  • Tapered handlebar
• “Shorty-style” adjustable front brake lever.
  • adjusts to fit various hand sizes
• Clutch lever holder allows for clutch lever reach adjustment.
  • adjusts to fit various hand sizes.
• 190 mm stainless steel rear disc brake squeezed by a single piston caliper.
  • Excellent stopping power
  • caliper is protected by a rugged plastic protector
• Lightweight, blue 17-inch front and 14-inch rear DID rims.
  • excellent durability
  • reduces unsprung weight for optimal suspension performance
  • new Dunlop MX3S knobby tires offer exceptional traction
• Modern, aggressive, slim line bodywork.
  • slim body design for excellent freedom of movement and rider mobility

/// DETAILS

• Sealed tapered steering head bearings for extra durability
• Serrated rear brake pedal and folding shift lever tip
• Wide, cast-alloy serrated footpegs offer good grip
• Stainless steel inner clutch cable for longer life and smooth operation
• Rubber boots on clutch and brake levers to reduce dirt, mud and water entry for durability
• Convenient lifting holes in side cover
• New rugged chain guide helps prevent chain from de-railing and also protects rear sprocket
• E10 friendly fuel system components