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85 SX 19/16 - 2019

£4,999.00



Model Description

The 11 to 15-year-old riders in the junior class are no longer novices. These are future champions fighting to come first, regardless of whether the aim is the junior world championship or regional qualifying events. The KTM 85 SX in this segment is considered to be an out-and-out winner's bike and the benchmark to go for. This is no surprise really, as it boasts a state-of-the-art engine developed by KTM, combined with a high-end frame and a super lightweight, rugged chassis to make up a perfect overall package.

EXHAUST SYSTEM
KTM has designed the exhaust system fitted to the KTM 85 SX to match the power delivery of the engine. This contributes to the unrivaled performance and to the excellent rideability of this bike. The header is manufactured using a special 3D stamping process. The individually shaped components are welded together using robots – this guarantees maximum durability and compliance with the highest quality standards, which characterize all products manufactured by KTM. The particularly lightweight silencer complies with the sound limits specified by the FIM.

CYLINDER & PISTON 
The KTM 85 SX 2-stroke engine has a bore diameter and stroke of 47 and 48.95 mm respectively. A particular highlight is the innovative power valve. This system controls both the main exhaust port and the two sub ports. The result is an unrivaled power and torque with an impressive mid-range power, in addition to excellent control. This means that on sand and muddy terrain in particular, the rider does not need to use the clutch as much. A screw adjuster allows the timing of the power valve to be fine-tuned to suit the rider's preferences or the track conditions. With the aid of various power valve springs, which are available from the KTM PowerParts program, the power valve can be adjusted even further.

ENGINE CASE
The engine cases are manufactured using a high-pressure die-cast process offering the benefit of minimized wall thicknesses, combined with high strength and durability. In addition, due to this very compact design, the crankshaft has been located very close to the bike's centre of gravity – this enhances agility and predictable handling.

CLUTCH
The robust and reliable clutch in the KTM 85 SX has a diaphragm spring. This reduces the clutch lever force and contributes to the extremely compact construction. As a result of the hydraulic clutch mechanism from Formula, the pressure point remains unchanged throughout the entire service life of the clutch, regardless of the ambient conditions.

TRANSMISSION
KTM 85 SX riders enjoy the benefits of the lightweight and robust 6-speed transmission. The gear ratios, which are matched perfectly to the engine characteristics, deliver powerful acceleration whatever the situation. The gear changes are very smooth and precise, allowing the rider to concentrate on keeping to his ideal line. The design of the self-cleaning gear shift lever is similar to that of the footpegs and prevents dirt from building up to guarantee perfect control in all conditions.

ENGINE
With its state-of-the-art 2-stroke technology, the KTM 85 SX is setting new performance standards in the highly competitive 85cc class. KTM has mated the extremely compact engine to a precise 6-speed transmission, with the result that the KTM 85 SX is an absolute knock-out over the entire rpm range, delivering first-rate performance and exemplary rideability. The key to the engine's unrivaled performance is the specially designed power valve, which controls the exhaust valve and provides a particularly smooth and consistent power delivery.

COOLING SYSTEM
The KTM 85 SX features unbeatable performance in all conditions. One of the key factors for this is the intelligent cooling circuit with integrated crankcase cooling and two radiators. This advanced solution provides a constant temperature balance and consistent high performance. The coolant is rooted from the cylinder head through the frame triangle directly to the aluminum radiators which have been flow-optimized using modern computational fluid dynamics (CFD) technology. The specially designed radiator shrouds not only protect the "heart" of the KTM 85 SX from dirt and flying stones, but also deflect impact energy around the radiators in the event of a crash.

AIR FILTER BOX
The air filter box has been designed specifically to combine maximum performance with maximum protection. The air filter is easily accessible without any special tool. All that needs to be done is to remove the left-hand side cover. The Twin Air filter and case are also designed to simplify maintenance and to prevent the filter from being installed incorrectly.

Model Specification

Engine

Engine Type

Single cylinder, 2-stroke

Displacement

84.9 cc

Starter

Kickstarter

Transmission

6 gears

Engine Lubrication

Mixture lubrication

Cooling

Liquid cooled

Clutch

Wet multi-disc clutch, Formula hydraulics

Ignition

MEDJ Digital

Frame

Frame

Double grinded central double-cradle-type frame

Chain

1/2 x 5/16

Steering Head Angle

66 degrees

Tank Capacity

5.2 litres

Performance

Primary Gear Ratio

20:64

Secondary Gear Ratio

13:46

Brake System Front

Disc brake 240 mm

Brake System Rear

Disc brake 210 mm

Suspension

Front Suspension

WP USD AER 43

Rear Suspension

WP PDS shock absorber

Suspension Travel Front

278 mm

Suspension Travel Rear

305 mm

Dimensions

Bore

47 mm

Stroke

48.95 mm

Wheelbase

1290 mm

Ground Clearance (unloaded)

362 mm

Seat Height

890 mm

Weight (No Fuel)

68 kg