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KTM 450 SX-F 2018:DROP THE HAMMER

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If gold is what you’re after, a KTM 450 SX-F is what you get. Thanks to its compact engine delivering explosive but controllable power, it’s the weapon of choice for the Red Bull KTM Factory Racing Team and the champion, Ryan Dungey. This READY TO RACE bike rules the AMA Supercross Championship. Its secret? Precise handling and arm-stretching grunt. Winners - line up here.

 

ENGINE

The hugely successful 450 SX-F powerhouse has extremely

compact dimensions, strong performance throughout the rev

range and a low weight; this is the lightest 450 engine

on the MX market. But that doesn’t mean it’s not a heavyweight

in terms of muscle. Fitted with a single overhead camshaft cylinder

head and the latest electronic fuel injection, it pumps out an

unrivaled 62hp. With KTM’s engineers working tirelessly to increase

service intervals, this super stroker has the latest engine management

technology on board and confidently shoots both

amateurs and pros to the top of their time sheets.

 

 

 

 

 

CYLINDER HEAD

Inside the SOHC cylinder head, an overhead camshaft controls

four ultra-lightweight titanium valves via extremely

rigid rocker arms, which are DLC-coated on the intake side. A

configuration like this allows engine speeds of up to 11,500rpm;

a baffling figure for a large displacement thumper. Lateral

brackets made of aluminum allow an efficient fixation of the

engine to the frame and contribute to the bike’s featherweight feel.

 

 

 

 

CRANKSHAFT

The KTM 450 SX-F’s crankshaft utilizes a short connecting rod,

which makes for an overall compact and lightweight engine

with a snappy power delivery. A plain big (bottom) end

bearing with two force-fitted bearing shells runs directly on

the crank pin. The necessary oil feed for this bearing is ensured

by the engine’s pressurized lubrication. This design is a

decisive benefit in terms of the crankshaft service interval,

which can be lengthened due to the plain bearing.

So just pin it, all day long.

 

CRANKCASES AND COVERS

The design of the die-cast crankcases allows for minimal

weight and a very centralized shaft configuration. This makes the

engine short and compact, while contributing to an efficient

centralization of masses. The engine covers also feature a solid surface

structure, which reduces the wear caused by the rider’s boots.

This way, your SX-F will keep looking better longer.

 

TRANSMISSION

The KTM 450 SX-F uses a lightweight 5-speed transmission with

gear ratios that are perfectly matched to the power delivery

of its large displacement engine. The 1st and 3rd gears

are treated with a special surface coating for better reliability.

An advanced ´No Dirt´ gear shift lever design prevents mud

and sand from blocking the joint of the lever and guarantees

trouble-free shifting. All 4-stroke engines are fitted with

a gear position sensor, giving the option of different engine

characteristics for each gear. In MY2018, the transmission shaft gets

a stronger shifting star and a C4 bearing that has a bigger

overlap in the case. This guarantees better reliability even at

extremely high operating conditions. Think GP-level riding.

In knee-deep sand.

 

ENGINE MANAGEMENT SYSTEM

The state-of-the-art Keihin engine management system with

electronic fuel injection features a 44mm throttle body.

Thanks to its unique injector position, the engine’s response

is instantaneous. And to make life even easier, separate systems for

cold starts and idle adjustment await you. The lightweight control

unit features a unique traction and launch control system for

lightning-quick response when the gate drops and maximum

grip thanks to different maps that sync with to the gear

you’re in. It’s also possible to unleash an even more powerful

mapping via the handlebar map select switch.

 

CYLINDER AND PISTON

Inside the short cylinder, with a bore of 95mm, thumps a

box-type piston made by CP. Its crown geometry is

adapted perfectly to the high-compression combustion

chamber, where its rigid structure and low weight shine.

Thanks to the low oscillating masses, the engine

is as snappy as it is strong.

 

BALANCER SHAFT

The side mounted counter balance shaft also drives the

water pump. Thanks to its perfect balance and low oscillating

masses, engine vibrations are kept to a minimum. Even

when revving it all the way up to the maximum,

just the way an SX-F likes it.

 

CLUTCH

The KTM 450 SX-F employs the KTM-developed DDS clutch

(damped diaphragm steel) with a robust steel basket, extremely

heat resistant clutch plates and new, nitrated steel liners

reducing the wear. This clever design employs a diaphragm spring

instead of the usual coil springs, making for considerably easier

clutch action. A diaphragm spring also leaves sufficient space for

a damping system to be integrated into the clutch hub.

The goal is traction, but durability is as well. Light operation and telepathic

amounts of control are standard with this hydraulic Brembo

actuated clutch.

E-Starter

The KTM 450 SX-F is fitted with a unique E-starter as standard,

which is a clear advantage when it comes to crunch time

in the heat of battle. A strong starter motor made

by Mitsuba will fire time and time again at the push of a button.

 

COOLING SYSTEM

KTM’s proven cooling system 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.

 

WEIGHT

KTM engineers just love dropping weight year after year. The result:

the 2018 KTM SX models are the slimmest, lightest dirt bikes

out there. Even though the 4-strokes are equipped with

an E-starter as a standard feature, while the competition

still needs to be kickstarted. You can just focus on kicking ass.

 

FRAME

The high-tech, lightweight chrome-moly steel frame has a knack

for easy handling, outlandish rideability, precise cornering and

excellent stability. You can also count on high torsional rigidity

and low longitudinal stiffness. This results in better absorption

of the energy created from the front and rear suspension,

sucking up jumps and bumps. In short: more comfort and less

rider fatigue. Laterally attached, lightweight aluminum engine

head stays (the connection between cylinder head and frame) contribute

to more precise cornering and a reduced vibration level. The

engineers were able to pull off all that, while making their frame

a big fat kilogram lighter than that of the lightest competitor

on the market. In addition, it is easier to maintain, easier to work

on and supplies more space for the tank and other components. The bike also

features an extra-light subframe made of stable aluminum

profiles, which tiptoes the scales at less than 900g.

 

FOOTPEGS

Sophisticated ´No Dirt´ footpegs prevent clogging of the

footpeg pivot, even when digging in deep ruts. Looking

for a higher riding position? Then just mount the footpegs

of the MY2018 EXC models, which are 6mm higher than the

SX versions.

 

AIR FILTER BOX

The airbox design offers maximum protection of the air filter against

soiling, while ensuring maximum airflow. The large twin-air

filter is mounted in a stiff cage, which at the same time holds

the system in place. This design is so simple, you could still

pop a fresh one in with a face full of mud. Without

tools. In seconds.

 

EXHAUST SYSTEM

FIM noise limits are a real challenge for every manufacturer.

Therefore, KTM has put a lot of effort into the development

of their exhaust systems. All 4-strokes are fitted with headers

that have a unique standard feature; an additional resonator

system – a small chamber connected to the pipe. All 4-strokes

are fitted with a short silencer, mounted as close to the engine as

possible. You know what that means: extra mass centralization

and better rideability. Its advanced internal design reduces the

noise sufficiently in order to sit safely below the noise limit,

while still raising the hairs on your neck.

 

HANDLEBAR

KTM engineers sure know how to handle handlebars. This tapered

one, made of high-strength aluminum, is fixed in damped

rubber mounts and has two different positions.ODI lock-on

grips make grip changes easy and do not require any

wire or glue to be secured.

 

 

SWINGARM

The cast aluminum design offers low weight and a perfect flex

behavior. The single-component casting process eliminates

any inconsistencies and inherent weak points

created by welding. It’s better looking too.

 

FUEL TANK

A lightweight polyethylene tank with a capacity of 7.0 liters.

The fuel tank cap has an inside thread, which

makes for easy and reliable closure.  

 

WHEELS

The KTM wheels feature lightweight, CNC machined hubs

and high-end Excel rims guaranteeing maximum

stability at minimum weight. The wheels are fitted with

the latest Dunlop Geomax MX 3S tires.

 

SHOCK ABSORBER

The WP monoshock has been developed with the entire

frame and swingarm architecture in mind, including the

linkage system and the WP AER 48 front forks. It features

machined and black anodized components and is a valuable,

high-end product compared to roughcast reservoirs. A new

setting and a softer spring perfectly match the reworked front-end

set-up and its sparkling WP color scheme lets everyone

know you have excellent taste in suspension.

 

FORK

The lightweight WP AER 48 front fork, a 48mm USD air-sprung fork

developed by WP in close collaboration with KTM, is a split

fork with separate functions for each leg. That means damping functions

are on the right side, whereas the air spring is in the left.

This left leg features a 2-chamber system with a capsuled air

cartridge to prevent loss of air pressure. Should the outer

seal start to leak, the internal cartridge pressure will keep the bike

in position. The air spring is easy to adjust to any rider

weight via a single air valve. No special tools are required; the

fork air pump supplied with the bike will do just fine. The right

fork leg integrates a damping cartridge that tailors to all your

damping needs. It can be adjusted to the track conditions and

the rider’s preferences with a twist of a dial (compression from the top,

rebound from the bottom, 30 clicks each). Right off the dealer floor, this

fork (with reworked damping characteristics) is more comfortable and more

sensitive than ever. But you can still hammer the hell out of it.

 

TRIPLE CLAMP

Top quality, CNC machined triple clamps have been a KTM trademark

for years to ensure precise handling. The rubber damped handlebar

fixation allows for two positions and an hourmeter is fitted in

order to let the rider know it’s time for a service.

 

BRAKES

Top quality, CNC machined triple clamps have been a KTM trademark

for years to ensure precise handling. The rubber damped

handlebar fixation allows for two positions and an hourmeter

is fitted in order to let the rider know it’s time for a service.

HANDLEBAR MAP SELECT SWITCH

All 4-stroke models are equipped with a sophisticated new

multi-functional handlebar map select switch, which does

three things: Activation of the traction control Activation of the

launch control Selection of an alternative power curve (Standard or

Advanced) The traction control is a unique feature that

none of the competitors can offer. It guarantees more efficient

traction when the track conditions are less than perfect.

Push the tip switch and reign supreme. With this map select

switch the rider can also activate the launch control, which

provides more efficient starts out of the gate so you can go

for the holeshot, time and time again. How? It simply reduces the maximum

engine speed for the very first moment of the start, in order

to give you better control. Push both tip switches when the

engine idles and the EFI control lamp mounted on the upper

triple clamps will let you know you are READY TO RACE.

In addition, the map select switch gives the rider the chance

to select an alternative, more powerful map beside

the standard configuration. Welcome to the future.

 

BATTERY & WIRING HARNESS

A strong new lithium-ion battery breathes life into the engine and

contributes to low vehicle weight. The lightweight battery and

wiring harness are centralized in a compartment above

the air filter box, allowing the mechanic to remove the

subframe without getting in conflict with the electronics.

A happy mechanic is a good mechanic.

 

E-STARTER

Like all KTM 4-stroke motorcycles, the 450 SX-F is started

at the push of a button - a priceless advantage when

you’re on the clock.

 

 

BODYWORK

KTM R&D, KISKA Design and all our factory riders had

their say in shaping the plastics with one goal: complete

harmony between rider and bike. Perfect ergonomics and contact

points provide maximum comfort in movement on the SX-F.

The I-beam structures of the front and rear fenders

guarantee maximum stability and a low weight thanks to well

thought-out construction and mounting.

They also stay cleaner for longer.

 

GRAPHICS

A new, tailor-made kit and a Factory orange frame. Because

in this sport, champs deserve to look the part regardless of the dirt.

 

 

 

 

 

TECHNICAL DETAILS

 

ENGINE

 

Design 1-cylinder, 4-stroke engine
Displacement 449.9 cm³
Bore 95 mm
Stroke 63.4 mm
Starting Electric starter
Transmission 4-speed
Primary drive 31:76

Secondary gear ratio

13:48

Clutch Wet, DDS multi-disc clutch, Brembo hydraulics
EMS

Keihin EMS

   

 

Chassis

 

Frame design

25CrMo4 steel central-tube frame

Front suspension

WP-USD, AER 48, Ø 48 mm

Rear suspension

WP shock absorber with linkage

Suspension travel (front)

310 mm

Suspension travel (rear)

300 mm

Front brake

Disc brake

Rear brake

Disc brake

Front brake disc diameter

260 mm

Rear brake disc diameter

220 mm

Chain

5/8 x 1/4"

 

Steering head angle

63.9 °

Wheelbase

1485 ± 10 mm

Ground clearance

370 mm

Seat height

960 mm

Tank capacity (approx.)

 7 l

Weight READY TO RACE (without fuel)

100.2 kg

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