Built around KTM's prototype - concept model motorcycle platform, the 2003 KTM 85 SX utilizes a 84.9 cc (5.2 cu in) liquid-cooled single cylinder, two-stroke layout. Internal engine geometry specifies a bore and stroke of 47.0 x 49.0 mm (1.9 x 1.9 inches).
On the scales, the 85 SX measures 72 kg (159 lbs) dry. Rider ergonomics and chassis geometry center around a 890 mm (35 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,290 mm (50.8 in) wheelbase engineered for quick, flickable steering geometry. The 5.2-liter (1.4 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's KTM archive, this model family spans 4 indexed model years from 2003 to 2019, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
890 mm (35 in)
Engine
Displacement84.9 ccm (5.18 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Bore x Stroke47.0 x 49.0 mm (1.9 x 1.9 inches)
Valves/Cylinder0
Fuel SystemCarburettor
Fuel ControlReed valve / power valve
IgnitionMoric digital 2M1
Lubrication0,5 l Motorex Topspeed 4T
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet
DrivelineChain final drive
Chain Size428
Chassis
Frame TypeCentral-tube frame with double-cradle
Front SuspensionWP upside-down Ø 43 mm
Front Travel275 mm (10.8 inches)
Rear SuspensionWP monoshock
Rear Travel300 mm (11.8 inches)
Wheelbase1290 mm (50.8 inches)
Ground Clearance362 mm (14.3 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 Ø200 mm (7.9 inches)
Dimensions & Weight
Dry Weight72.0 kg (158.7 pounds)
Seat Height890 mm (35.0 inches) If adjustable, lowest setting.
Fuel Capacity5.20 litres (1.37 US gallons)
Oil Capacity1.30 litres 2T reservoir / 0.80 L gearbox
Service & Fluids
Engine Oil2-stroke synthetic motorcycle oil (API TC / JASO FC/FD)
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.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
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.
