Description
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.
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ENGINE
For 2019, the YZ85's compact, lightweight 85 cc two-stroke engine features revisions to the intake, exhaust and transmission. The addition of YPVS creates broad, tractable power across the rev range without losing peak power at high rpm. |
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.
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Features & Benefits
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NEW FOR 2019
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Yamaha Power Valve System (YPVS)
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New cylinder head and longer connecting rod
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New crankcase design
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New spacer-style reed valve intake
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New optimized expansion chamber
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Revised transmission
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Adjustable rider ergonomics
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New swingarm design
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Upgraded brake line and wave-style rotors
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New Dunlop MX3S tires
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Key Features
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Potent, easy-to-service two-stroke engine
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Broad, tractable power across the rev range
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Smooth-shifting, six-speed, close-ratio transmission
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Compact, semi-double-cradle, single-backbone steel frame
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Race-ready, fully adjustable suspension
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Aggressive YZ styling
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Engine
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Lightweight, compact, 85cc, liquid-cooled, crankcase reed-valve inducted, 2-stroke single.
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Yamaha Power Valve System (YPVS).
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Mechanical power valve system delivers effective exhaust timing throughout the entire rev range
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Provides excellent power and torque characteristics
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Boosts compression ratio and power output
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Delivers responsive acceleration just as the rider intends
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Slit-shaped valve on the side of the exhaust port operates in response to engine rpm
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In low-to-mid-rpm range when exhaust timing is slower, valve moves to cover the top part of the exhaust port
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In high rpm range when quick exhaust timing is needed, valve recedes and exhaust port is fully uncovered
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Shifting is reduced due to broader powerband
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Crankcase reed valve induction and 28 mm Keihin flat-slide carburetor.
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crisp, seamless throttle response across the powerband
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new design features spacer-style reed valve intake for improved gas flow
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Carburetor settings optimized for updated engine
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Lightweight, forged piston.
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less reciprocating mass and less friction for a faster revving engine
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excellent durability
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CDI ignition system.
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provides a hot, precise spark for fast sure starts
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provides optimal timing for quicker, stronger response at all rpms
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maintenance-free
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Smooth-shifting, six-speed transmission.
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involute design increases the surface area contact between the gears
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special involute splines on main and drive shafts provide maximum engagement / hook-up for each gear for smoother, more positive shifts
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gear ratios are well matched to engine output
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Gear dimensions optimized for 2019 based on YPVS engine performance
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Heavy-duty, multi-plate clutch.
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Quick-remove, clutch sub-cover.
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Lightweight radiator with high-capacity cores and special louvers to direct the air through the rad.
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maximum cooling efficiency
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Large-capacity airbox with washable, dual-stage, foam filter.
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excellent filtering qualities
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reduced expenses
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Lightweight exhaust system.
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revised expansion chamber matches the improved output of YPVS engine
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aluminium silencer is re-packable to maintain optimum performance and reduced noise levels
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Chassis/Suspension
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Rigid, semi-double cradle, single backbone, steel frame.
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blend of light weight and good strength
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minimal flex for razor-sharp, moto-wining handling
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Detachable rear subframe.
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allows easy access for suspension maintenance
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reduces costs in the event of a loop-out (subframe can be purchased separately)
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Revised, lightweight box-section aluminium swingarm.
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composite chain guide and updated chain adjusters provide easier maintenance
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provides excellent rear-wheel control and traction
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Adjustable 36mm inverted KYB fork with 275 mm (10.8 in) of wheel travel.
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new low-friction outer tubes and internals are similar to full-size YZ models
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20 clicks of both compression and rebound damping
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adjustable design allows suspension settings to match rider weight, rider style and track conditions
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YZ125 / 250-based "big bike" valving and low-friction fork seals
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smooth, compliant stroke for superior suspension performance and handling
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front fork guard redesigned with brake hose outside of fork guard
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Fully adjustable Monocross link rear suspension provides 282mm (11.1 in) of wheel travel.
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Kayaba piggyback shock reduces shock temperatures during a long moto for fade resistant damping and consistent performance.
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adjustments include "threaded" spring preload, 15 clicks of compression and 20 clicks of rebound damping
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optional shock springs are available through Yamaha Genuine Parts and Accessories
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220 mm front stainless steel wave front disc with twin-piston caliper.
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delivers strong stopping power with excellent control and great feedback.
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New tapered aluminum handlebar and adjustable crown.
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"Shorty-style" adjustable front brake lever.
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adjusts to fit various hand sizes
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Clutch lever holder allows for clutch lever reach adjustment.
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adjusts to fit various hand sizes.
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190 mm stainless steel rear disc brake squeezed by a single piston caliper.
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Excellent stopping power
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caliper is protected by a rugged plastic protector
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Lightweight, blue 17-inch front and 14-inch rear DID rims.
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excellent durability
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reduces unsprung weight for optimal suspension performance
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new Dunlop MX3S knobby tires offer exceptional traction
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Modern, aggressive, slim line bodywork.
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slim body design for excellent freedom of movement and rider mobility
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DETAILS
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Sealed tapered steering head bearings for extra durability
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Serrated rear brake pedal and folding shift lever tip
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Wide, cast-alloy serrated footpegs offer good grip
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Stainless steel inner clutch cable for longer life and smooth operation
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Rubber boots on clutch and brake levers to reduce dirt, mud and water entry for durability
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Convenient lifting holes in side cover
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New rugged chain guide helps prevent chain from de-railing and also protects rear sprocket
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E10 friendly fuel system components
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