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ID # 17383394

2021 Yamaha YZ85

  • 2021 Yamaha YZ85
  • 2021 Yamaha YZ85
  • 2021 Yamaha YZ85
  • 2021 Yamaha YZ85
  • 2021 Yamaha YZ85
  • 2021 Yamaha YZ85
  • 2021 Yamaha YZ85
  • 2021 Yamaha YZ85
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Overview

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.

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.
Features & Benefits
   
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
 Engine
  • Lightweight, compact, 85 cc, 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 broad powerband
  • 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
  • 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 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.
    • expansion chamber designed to match the 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)
  • Lightweight box-section aluminium swingarm.
    • composite chain guide and updated chain adjusters provide easier maintenance
    • provides excellent rear-wheel control and traction
  • Adjustable 36 mm inverted KYB fork with 275 mm (10.8 in) of wheel travel.
    • 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 282 mm (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.
  • 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
    • 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

 

Specifications
Model
YZ
Category Name
Motorcycles
Year
2021
Width
760 mm (29.9 in)
Engine
2-stroke, liquid-cooled, crankcase-reed-valve single with YPVS
Height
1145 mm (45.1 in)
Length
1,820 mm (71.7 in)
Wheelbase
1255 mm (49.4 in)
Seat Height
840 mm (33.1 in)
Transmission
Constant mesh, 6-speed
Fuel Delivery
Keihin PWK38
Bore And Stroke
47.5 x 47.8 mm
Ground Clearance
330 mm (13 in)
Compression Ratio
8.2-9.6:1
Ignition / Starting
CDI / Kick

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