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KTM 85 SX 17/14 2018:STEP INTO THE BIG LEAGUES

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The 11 to 15-year-old riders of the junior class are no longer beginners. These are future champions fighting for victory, no matter if it is the Junior Motocross World Championship or a regional championship. In this scene, the new and improved KTM 85 SX is considered a winner's bike. With the most powerful engine in the field and a super lightweight, stable chassis, it does not need to shy away from a full size bike.

 

ENGINE

Cutting-edge 2-stroke technology, combined with

a precise 6-speed transmission and hydraulic

clutch are the foundation of the KTM 85 SX’s superiority

in all junior racing competition. The new KTM 85 SX engine

uses the latest technology to deliver unrivaled performance

in the competitive 85cc class. With an unchanged bore

and stroke, the engine is 0.69kg lighter and delivers improved

power and rideability along the complete rev range. Key to the

engine is a new power valve which allows the power

delivery to be tailored simply and more effectively than before.

 

 


 

CYLINDER

The new cylinder has an unchanged bore and stroke

(47/48.95mm) with new ports to improve performance

and response. Additionally, it is designed around an

all new power valve system. This system controls both

the exhaust valve and the sub exhaust port for

significantly improved power, torque and controllability.

As a result, the KTM 85 SX receives a significant

increase in mid-range performance reducing the need

to use the clutch in loamy or sandy conditions. An

adjuster screw allows the opening time of the power

valve to be adjusted to suit rider preference and track

conditions and by changing between different power

valve springs – available in the KTM PowerParts

catalog – the rate at which the power valve

opens can be tailored even further.

 

 

 

Crankshaft

The new crankshaft is now lighter with optimized

balancing to reduce vibration and oscillating mass.

Even after removing this weight, the rotational

inertia of the crankshaft has increased by

0.5kg improving torque and rideability.

 

 

 

Exhaust system

The new exhaust system is perfectly suited to

the engine’s power characteristics and contributes

to the outstanding performance and rideability. The

header is made in a 3-dimentional stamping process by

WP Performance Systems. Once the components are

shaped they are robot welded to ensure the highest level

of quality and durability. The new silencer is 50mm shorter,

improving mass centralization.

 

Crankcases

The crankcases are manufactured using a high pressure

die-cast production process keeping wall thickness

to a minimum while retaining strength and durability.

The design of the new cases is more compact and aims at

positioning the shaft arrangements as close as possible

to the center of gravity for improved handling.

 

 

CLUTCH

The hydraulic clutch mechanism by Formula ensures an easy

clutch action and well-defined modulation on the

KTM 85 SX. Replacing the previous coil spring design,

the KTM 85 SX features a new diaphragm spring clutch.

The new design is 0.4kg lighter, more compact and

also benefits from added durability.

 

 

CRANKSHAFT

The all-new crankshaft is now lighter with optimized

balancing to reduce vibration and oscillating mass.

Even after removing this weight, the rotational inertia

of the crankshaft has increased by 0.5kg improving

torque and rideability. Thanks to its perfectly sized lightweight

connecting rod, the crankshaft is distinguished by

minimum vibrations and maximum durability.

 

 


  

HANDLEBAR

The KTM 85 SX has a super strong, tapered handlebar made

of high-quality aluminum alloy with a bend that’s perfect for

motocross requirements. They get a new throttle assembly

that allows for easy free play adjustment. ODI lock-on

grips on the left side make grip changes easy

and do not require any wire or glue to be secured.

 

 


 

BRAKES

The Formula brake system with radial calipers – four pistons

in front, two in the rear – with lightweight Wave brake

discs – front 240mm diameter, rear 210mm – are the benchmark

in terms of controlled action and braking performance. The piston size

on the rear caliper is reduced by 2mm to 22mm and in

combination with a new rear brake lever it provides improved

modulation and feeling.

COOLING SYSTEM

A constant temperature balance for consistent, high

performance is ensured by an intelligent cooling circuit

with integrated crankcase cooling and two radiators.

It routes the coolant from the cylinder head through the

frame triangle, directly to aluminum radiators made by WP.

Thanks to flow optimized internal circulation and

CFD-calculated ventilation, the system is superbly

efficient. In addition, new radiator protections improve

heat dissipation. Especially in the mud. They are

also integrated into the front part of the shrouds

to protect the radiators in a crash.

AIR FILTER BOX

What is good for the bigger KTM offroad bikes cannot be

bad for the 85 SX: an air filter change can be

done within seconds without tools.

Wheels

Black coated high-end Excel rims, lightweight, CNC

machined hubs and black spokes with lightweight aluminum

nipples ensure the highest stability at minimum weight

on the KTM 85 SX. The OEM MAXXIS tires are renowned

for their perfect traction and outstanding performance.

Frame

Professionally crafted by WP Performance Systems, the

chromium molybdenum steel frame is constructed using

hydro formed tubes joined by precision robot welding

to ensure the highest level of consistent quality. The

frame sees a weight saving of 0.7kg and features a new

geometry aimed at tailoring flex characteristics for improved

handling and comfort. As a result, and in conjunction

with new laterally mounted cylinder head mountings, the

torsional rigidity is increased by 7% while longitudinal stiffness

is reduced by 25%. This allows the frame to move in harmony

with the suspension effortlessly soaking up big hits while also

delivering improved agility and high speed stability. Additionally,

the frame is fitted with new ´No Dirt´  footpegs which prevent

the build-up of dirt collected through deep ruts and muddy

terrain. The simple but effective self-cleaning system ensures

the footpeg returns to its original position providing complete

control in all conditions. The frame is finished off in

a highly durable powder coating with standard frame

protectors.

 

Subframe

Made from lightweight aluminum, the new subframe

features a shorter and more compact profile. It is

now 75mm shorter and 0.2kg lighter, which not only

contributes to the overall weight reduction but also

improves mass centralization.

 

FRONT SUSPENSION

Up front, the WP AER 43 consists of a split fork design

using a capsuled air spring in the left leg and the

trusted oil damping system in the right leg. The new components

offer a significant improvement in suspension performance

with a reduction in weight of 1.0kg and an increase

in wheel travel to 280mm total (+10mm). Additionally,

adjustment is made simpler thanks to the single air

pressure valve and supplied fork air pump for preload

and easy access clickers for compression and rebound.

 

.

 

REAR SUSPENSION

On the rear, a specific version of the new WP Xplor

PDS shock absorber is fitted to the KTM 85 SX. PDS stands

for the unique progressive damping system developed by

WP together with KTM which provides excellent sensitivity

and at the same time outstanding bottoming resistance.

Full adjustability of compression and rebound damping

and preload are KTM standard.

 

 

 

Bodywork

When scaled down to the proportions of an 85cc rider,

the contact points and feeling remain the same allowing

the younger riders to feel the same control and

comfort found on the larger models. The improved ergonomics

instill confidence while also leaving room for free and

unrestricted movement thanks to the broader

and flatter seat and one piece air filter box cover.

 

 

Graphics

The cool graphic design provides a striking look based

on the big bikes. Don’t be surprised when someone

mistakes you for a grown-up.

 

 

 


    

 

 

TECHNICAL DETAILS

ENGINE

Design 1-cylinder, 2-stroke engine
Displacement 84.9 cm³
Bore 84.9 mm
Stroke 48.95 mm
Starting Kickstarter
Transmission 6-speed
Primary drive 20:64

Secondary gear ratio

13:46
Clutch Wet, multi-disc clutch, Formula hydraulics
EMS Kokusan

 

 

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