KTM 85 SX 19/16 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. The
engine became 0.69kg lighter and delivers improved power
and rideability across the 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.
Thus, the KTM 85 SX receives a significant increase in mid-range
performance reducing the need to use the clutch in muddy 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
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 KTM 85 SX features a new, lighter transmission. While keeping
the same motocross-specific ratios, shifting is improved allowing
the rider to select the next gear with confidence. Additionally,
similar to the footpeg design, a new self-cleaning gear shift lever
prevents the build-up of dirt ensuring complete control in all conditions.
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 protectors.
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.
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.
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. In the rear, a specific version of the new WP
Xplor PDS shock absorber is fitted to the KTM 85 SX.
It is fully adjustable for preload, compression and rebound.
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|
|Clutch||Wet, multi-disc clutch, Formula hydraulics|