ID # 34534048

2025 Yamaha YZ85

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Bobs Motorsport Ltd

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Built for fun. Built to win. The renowned YZ85 serves up big-bike specs in a small-bike package. Featuring the Yamaha Power Valve System (YPVS), fully-adjustable suspension, six-speed transmission and adjustable ergonomics, the YZ85 is ready to win races straight off the dealership floor.

Specifications

Model

YZ85

Category Name

Motorcycles

Year

2025

Sale Type

New

Manufacturer

Yamaha

Color

Team Yamaha Blue

Province

Ontario

engine

ENGINE

2-stroke, liquid-cooled, crankcase-reed-valve single with YPVS

FINAL DRIVE

Chain

DISPLACEMENT

85cc

TRANSMISSION

Constant mesh, 6-speed

FUEL DELIVERY

Keihin PWK28

BORE AND STROKE

47.5 x 47.8 mm

COMPRESSION RATIO

8.2-9.6:1

IGNITION / STARTING

CDI / Kick

chassis

TIRES (REAR)

90/100-14 Geomax MX3S

BRAKES (REAR)

190 mm disc / single-piston caliper

TIRES (FRONT)

70/100-17 Geomax MX3SF

BRAKES (FRONT)

220 mm disc / twin-piston caliper

SUSPENSION (REAR)

Fully adjustable KYB shock / 282 mm (11.1 in) wheel travel

SUSPENSION (FRONT)

Fully adjustable KYB 36 mm inverted fork / 275 mm (10.8 in) wheel travel

highlights

POTENT YPVS™ TWO-STROKE POWER

The 85cc liquid-cooled, two-stroke engine features the Yamaha Power Valve System for broad power across the rev range without losing peak power at high rpms—improving rideability and reducing the need for frequent shifting.

ENHANCED CHASSIS

For demanding junior racers, the YZ85's chassis is optimized for strength, rigidity and overall handling stability. The aluminum swingarm offers refined balance between longitudinal and torsional rigidity, and the removable rear subframe constructed from lightweight, high-strength aluminum reduces weight.

HIGH-QUALITY EMBEDDED GRAPHICS

Inspired by its YZ125 sibling, the sharp graphics scheme highlights the YZ's unmatched racing pedigree. Premium Yamaha Blue and dark blue graphics are embedded to provide excellent durability and scratch resistance.

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

critical data

WIDTH

760 mm (29.9 in)

HEIGHT

1135 mm (44.7 in)

LENGTH

1,820 mm (71.7 in)

COLOUR(S)

Yamaha Racing Blue

WHEELBASE

1255 mm (49.4 in)

WET WEIGHT

73 kg (161 lb)

SEAT HEIGHT

840 mm (33.1 in)

FUEL CAPACITY

5 litres (1.1 imp. gal.)

GROUND CLEARANCE

320 mm (12.6 in)

features & benefits

KEY FEATURES

Stylish blue, lightweight 17-inch front and 14-inch rear rims are durable, reduce unsprung weight for optimal suspension performance, and come wrapped in Dunlop® MX3S tires for exceptional traction.
Big 220mm and 190mm disc brakes offer precise control and one-finger stopping power.
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

New Air Intake Design
- Updated intake design allows for a straighter, more efficient draw of air into the intake tract.
Lightweight, compact, 85 cc, liquid-cooled, crankcase reed-valve inducted, 2-stroke single.
The crankcase design features a spacer-style reed valve intake for improved air/fuel flow, which inhales through a 28mm Hitachi Astemo® Keihin flat-slide carburetor for seamless throttle response.
Updated intake design allows for a straighter, more efficient draw of air into the intake tract.
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
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

The aluminum swingarm is redesigned in 2022 to refine balance between longitudinal and torsional rigidity
- Improved handling stability.
A new removable rear subframe constructed from lightweight, high-strength aluminum reduces weight.
A new flatter seat and more narrow fuel tank design, along with smoothly integrated body panels and slimmer shroud width, combine to enable greater freedom of movement forward and back.
- Allowing the rider to easily shift body weight for increased control and confidence.
Rigid, semi-double cradle, single backbone, steel frame.
- blend of light weight and good strength
- minimal flex for razor-sharp, moto-wining handling
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

Sharp New Graphics Scheme
- Inspired by its YZ125 sibling, a new graphics scheme highlights the YZ's unmatched racing pedigree. Premium Yamaha Blue and dark blue graphics are now embedded to provide excellent durability and scratch resistance.
The four-position adjustable handlebar mounts and taper-style handlebar allow the rider to tune the handlebar position to suit their size and preferences.
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