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 The latest-generation YZ85 has been built to dominate the 85 cc class. Featuring the Yamaha Power Valve System (YPVS), fully-adjustable suspension, six-speed transmission and adjustable ergonomics, the 2020 YZ85 is ready to win races straight off the dealership floor. |
ENGINE
 The 85 cc liquid-cooled, two-stroke engine features the Yamaha Power Valve System for broad, tractable power across the rev range without losing peak power at high rpm. |
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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. |
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Features & Benefits
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Key Features |
- 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
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Engine |
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Lightweight, compact, 85 cc, liquid-cooled, crankcase reed-valve inducted, 2-stroke single.
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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 broad powerband
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Crankcase reed valve induction and 28 mm Keihin flat-slide carburetor.
- crisp, seamless throttle response across the powerband
- design features spacer-style reed valve intake for improved gas flow
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Lightweight, forged piston.
- less reciprocating mass and less friction for a faster revving engine
- excellent durability
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CDI ignition system.
- provides a hot, precise spark for fast sure starts
- provides optimal timing for quicker, stronger response at all rpms
- maintenance-free
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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 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.
- maximum cooling efficiency
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Large-capacity airbox with washable, dual-stage, foam filter.
- excellent filtering qualities
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Lightweight exhaust system.
- expansion chamber designed to match the output of YPVS engine
- aluminium silencer is re-packable to maintain optimum performance and reduced noise levels
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