Yamaha Off Road Motorcycles YZ85/LW


2018 Off Road Motorcycles

Air Riders

Back in the day it was Yamaha who pioneered the first serious youth motocross bikes – and we’re proud of the fact that the YZ85 has launched the careers of so many top riders.

Some forty years on we’re still a major force in youth MX – and it’s this in-depth experience that gives the Yamaha the edge. Featuring advanced engine and chassis technology and sharp bodywork, the YZ85 and YZ85LW large wheel look super cool

The YZ85/LW has a reliable 2-stroke liquid-cooled 85cc engine which produces smooth and useable power – and with its easy handling chassis and modern image, this cool Motocross bike is the choice of future champions.


•  Lightweight youth motocross race bike
•  Powerful and useable 85cc 2-stroke engine
•  Revised port timing for more useable power
•  Close-ratio 6-speed transmission
•  Sharp bodywork and graphics
•  Styled like the bigger YZ models
•  Upside down front forks with 275mm travel
•  Link-type Monocross rear suspension
•  Long aluminium swingarm
•  Large diameter lightweight disc brakes
•  Semi-double cradle tubular lightweight frame
•  Also available in large wheel (YZ85LW) option


Yamaha Off Road Motorcycles YZ85/LW

Sharp bodywork

We figured than when you look good you feel good – and so we’ve kitted the YZ85 out in sharp bodywork that brings it in line with our adult motocross models. The package is completed with ‘factory bike’ style Speed Block graphics.

Yamaha Off Road Motorcycles YZ85/LW

Strong and useable engine performance

The YZ85’s ultra-compact and lightweight 2-stroke engine is famous for its strong yet manageable power that enables new and more experienced youth riders to race to the very best of their ability. The YZ85 delivers useable performance via its close ratio 6-speed transmission.

Yamaha Off Road Motorcycles YZ85/LW

Upside down front forks

The YZ85 features much of the technology first developed for our larger-capacity motocross bikes, and the upside down forks are a scaled down version of the advanced suspension used on the adult class YZ models. Featuring 36mm diameter inner tubes, these smooth-action forks give 275mm of wheel travel for excellent shock absorption.

Yamaha Off Road Motorcycles YZ85/LW

Monocross rear suspension

Like the front forks, the rear suspension featured on the YZ85 is directly descended from the technology used on our factory racers. A long aluminium swingarm activates the progressive link-type Monocross suspension system to give 282mm (LW model 287mm) of wheel travel that’s designed to handle everything from washboard sections to hard landings.

Yamaha Off Road Motorcycles YZ85/LW

Available in large wheel (YZ85LW) option

In order to accommodate riders of widely varying sizes in the youth class, this model is offered in two wheel size options. With a 17-inch front wheel and 14-inch rear wheel, the YZ85 is ideal for smaller riders, while the 19-inch front wheel and 16-inch rear wheel on the YZ85LW suits larger or older competitors.

Yamaha - Off Road Motorcycles - YZ85/LW

Large diameter disc brakes

Races are often won or lost by the rider who can brake latest, and so we’ve equipped the YZ85 with powerful disc brakes that offer plenty of feel. At the front there’s a lightweight large diameter 220mm diameter disc slowed by a compact caliper, while the 190mm diameter rear disc gives accurate rear wheel control.

Technical specifications


Engine type
Single cylinder, liquid-cooled, 2-stroke, reed valve
Bore x stroke
47.5 mm x 47.8 mm
Compression ratio
8.1 : 1
Maximum power
Maximum Torque
Lubrication system
Clutch Type
Wet, multiple-disc coil spring
Keihin PWK28/1
Ignition system
Starter system
Transmission system
Constant Mesh, 6-speed
Final transmission


Semi double cradle
Front travel
275 mm
Caster Angle
106 mm
Front suspension system
Upside-down telescopic fork
Rear suspension system
Swingarm, (link suspension)
Rear Travel
287 mm
Front brake
Single Disc, Ø 220 mm
Rear brake
Single Disc, Ø 190 mm
Front tyre
70/100-19 42M
Rear tyre
90/100-16 52M


Overall length
1,903 mm
Overall width
758 mm
Overall height
1,156 mm
Seat height
904 mm
1,286 mm
Minimum ground clearance
393 mm
Wet weight (including full oil and fuel tank)
73 kg
Fuel tank capacity
5.0 litres
Oil tank capacity
0.5 litres


Yamaha Off Road Motorcycles YZ85/LW - Racing Blue

Racing Blue