Kawasaki KX85 - 2021 Specifications and Reviews

The 2021 Kawasaki KX85 is a lightweight motocross bike engineered for young and amateur riders developing their skills on the track. Its 84cc two-stroke single-cylinder engine delivers sharp power delivery ideal for learning racecraft, while the responsive handling and manageable seat height make it an accessible entry point into competitive off-road riding.

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General information

CategoryCross / motocross
Year2021
ModelKawasaki KX85

Engine and Transmission Specifications

ClutchWet multidisc
Transmission typeChain   (final drive)
Gearbox6-speed
Cooling systemLiquid
Lubrication systemPetrol mix
IgnitionCDI with digital advance
Fuel systemCarburettor. Keihin 28mm
Bore x Stroke48.5 x 45.8 mm (1.9 x 1.8 inches)
Compression10.9:1
Engine typeSingle cylinder, two-stroke
Capacity:84.0 ccm (5.13 cubic inches)

Brakes, suspension, Frame and wheels

WheelsWire spoked
Rear brakesSingle disc. Petal disc with single-piston caliper
Diameter220 mm (8.7 inches)
Front brakesSingle disc. Petal disc with dual-piston caliper
Rear tire90/100-14
Front tire70/100-17
Rear wheel travel275 mm (10.8 inches)
Rear SuspensionUni-Trak® single shock system with 24-way compression and 21-way rebound damping, plus adjustable spring preload
Front wheel travel275 mm (10.8 inches)
Front Suspension36mm inverted telescopic cartridge fork with 20-way compression damping
Trail97 mm (3.8 inches)
Rake (fork angle)29.0°
Frame typeHigh-tensile steel perimeter design with subframe member
 
 

Physical measures and capacities

Fuel capacity5.00 litres (1.32 US gallons)
Wheelbase1265 mm (49.8 inches)
Ground clearance290 mm (11.4 inches)
Overall width765 mm (30.1 inches)
Overall length1830 mm (72.0 inches)
Overall height1100 mm (43.3 inches)
Seat height830 mm (32.7 inches) If adjustable, lowest setting.
Weight incl. oil, gas, etc75.0 kg (165.3 pounds)
 
 

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay
StarterKick
Color optionsLime Green

Performance Profile & Rider Fit

Best For

Track85%
City5%
Cornering88%
Daily Riding5%
Touring3%
Passenger0%

Rider Profile

Best ForThis is a competition motocross machine built for younger or smaller riders who already have solid off-road fundamentals, not a beginner's first bike.
PurposePurpose-built for motocross track racing and aggressive off-road riding, with a 2-stroke engine tuned for peaky, high-revving power delivery.
Rider FitIts small, lightweight chassis and low seat height suit smaller-statured or younger riders, with the KX85 L offering a slightly taller, more roomy alternative.
CharacterA snappy, high-strung 2-stroke that rewards clutch skill and revs, delivering sharp, flickable handling ideal for tight motocross circuits.
Not Ideal ForNot suitable for taller adult riders, road use, commuting, or anyone wanting a comfortable, low-maintenance everyday bike.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2021 Kawasaki KX85 Rider Ergonomics Assessment

Calculated in your browser only - your height/inseam are never sent to our servers.

Feet:

At 830mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with balls of both feet on the 2021 Kawasaki KX85, with a cramped knee angle of around 70 degrees and an upright riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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Rider Reviews

Total comments: 1
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MotorcycleDB Review

The 2021 Kawasaki KX85 is a powerful and high-performance motocross bike that is perfect for younger riders looking to take their skills to the next level. With a liquid-cooled 85cc engine and a six-speed transmission, this bike delivers impressive speed and control on the track. The adjustable suspension allows for a smooth and comfortable ride, while the lightweight frame makes it easy to handle in tight corners and jumps. Overall, the KX85 offers excellent power and handling for riders who are serious about motocross. The 2021 Kawasaki KX85 is a top choice for young motocross riders looking for a competitive edge. With its powerful 85cc engine, adjustable suspension, and lightweight frame, this bike offers impressive performance on the track. Whether you're navigating tight corners or tackling big jumps, the KX85 delivers excellent speed and control. If you're a young rider looking to take your motocross skills to the next level, the KX85 is definitely worth considering.
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