KTM 85 SX 17/14 2018:STEP INTO THE BIG LEAGUES
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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
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.
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.
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.
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.
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.
|Design||1-cylinder, 2-stroke engine|
Secondary gear ratio
|Clutch||Wet, multi-disc clutch, Formula hydraulics|