At the heart of the 2018 Kawasaki KX 85-I cross - motocross motorcycle, Kawasaki features a 84 cc (5.1 cu in) liquid-cooled single cylinder, two-stroke configuration. Internal engine geometry specifies a bore and stroke of 48.5 x 45.8 mm (1.9 x 1.8 inches) with a 10.0:1 compression ratio.
On the scales, the KX 85-I measures 69 kg (152 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 841 mm (33.1 in) seat height — resulting in a taller command-style riding posture suited to medium-to-tall inseams, combined with a 1,255 mm (49.4 in) wheelbase engineered for quick, flickable steering geometry. The 5-liter (1.3 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Kawasaki archive, this model family spans 4 indexed model years from 2017 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
841 mm (33.1 in)
Engine
Displacement84.0 ccm (5.13 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsPiston reed valve
Compression10.0:1
Bore x Stroke48.5 x 45.8 mm (1.9 x 1.8 inches)
Fuel SystemCarburettor. Keihin PWK28
IgnitionElectric CDI w/digital advance
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
Chassis
Frame TypeHigh-tensile steel perimeter design with subframe member
Rake29.0°
Trail97 mm (3.8 inches)
Front Suspension36mm inverted telescopic cartridge fork with 18-way compression damping
Front Travel275 mm (10.8 inches)
Rear SuspensionUni-Trak single-shock system with 4-way compression and 16-way rebound damping, plus adjustable spring preload
Rear Travel275 mm (10.8 inches)
Wheelbase1255 mm (49.4 inches)
Ground Clearance340 mm (13.4 inches)
Wheels & Brakes
Front Tyre70/100-17
Rear Tyre90/100-14
Front BrakesSingle disc
Front Brake Ø220 mm (8.7 inches)
Rear BrakesSingle disc
Rear Brake Ø184 mm (7.2 inches)
WheelsWire spoked
Dimensions & Weight
Weight incl.69.0 kg (152.1 pounds)
Seat Height841 mm (33.1 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
