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KTM 250 EXC TPI 2018:Speed injected

Utsalgspris kr75.750


When the smoke clears, you’ll be the last rider standing. The KTM 250 EXC TPI is one of the best pound-for-pound fighters in the world of Enduro, pummeling its more complex 4-stroke rivals. All muscle, no fat: this groundbreaking, fuel-injected 2-stroke machine is as lean as it is powerful.


The KTM 250cc engine is known to be the most powerful

and most competitive 2-stroke engine of the class.

And things get even better. For MY18 the KTM 250 EXC

(EU model only) is fitted with newly developed TPI

(transfer port injection) fuel injection system, a unique

feature when it comes to sporty 2-stroke race bikes. The

patented EFI system with two injectors mounted on

the transfer ports of the cylinder makes the engine much

smoother to ride and reduces the fuel consumption drastically,

a global game changer in terms of technology. On top

of that, the KTM 250cc powerhouse features a modern shaft

arrangement that’s beneficial in terms of mass centralization,

a well-protected E-starter, a balancer shaft for low engine

vibrations, a 6-speed Enduro transmission and a hydraulically

operated DDS clutch. This is a song of belly tingling 2-stroke

symphony when keeping it pinned on the pipe, while still

being able to deliver ultra-smooth and reliable

drive when you need it.




The KTM 250 EXC TPI cylinder has a bore of 66.4mm

and is fitted with the sophisticated power valve

providing smooth and controllable power characteristics.

For the EFI application the new cylinder features two lateral domes,

which hold the fuel injectors supplying fuel into the rear transfer ports.

Thus the loss of unburnt fuel is reduced for less emissions,

a more efficient combustion and reduced fuel consumption.

A little tube in the back of the cylinder is connected

with an intake pressure sensor, which supplies pressure data

to the control unit. Furthermore, it’s possible to change the bike’s

mood in seconds thanks to two supplied power

valve springs. Limitless settings for different tracks and preferences

are up for grabs.



Oil pump

Pre-mixing 2-stroke fuel is a thing of the past for

KTM EXC TPI owners. An electronic oil pump feeds

oil from the oil tank via the throttle body into the engine

intake, and ensures a perfect fuel-oil mix in all conditions

and engine speeds. The system, which reduces up to

50% of the smoke from the exhaust system over

previous models, is managed by the control unit based on

the engine’s revs and load measured by the

TPS (throttle position sensor). The oil capacity

of approximately 0.7 liters is enough for 5-6 refills

of fuel, giving you more time to ride, less time measuring things out.





For optimal mass centralization the lightweight

die-cast crankcases hold the clutch shaft and

the crankshaft in a high position close to the center

of gravity. Which is nice if you care about sweet handling.

In addition, it allows the implementation of a balancer shaft.

So your ride will be as relaxed as it is rapid.

Plus, your new favorite engine will keep looking

as fresh as the day you bought it: the engine covers

feature a smart surface structure that reduce the

wear caused by the rider’s boots.




This 6-speed Enduro transmission features an Enduro-specific

wide-ratio specification and provides precise and easy shifting.

Keeping safety in mind, an advanced ´No Dirt´ gear shift

lever design prevents muck from blocking the joint.

Because even dirt lovers hate mud when it’s in the wrong places.




Balancer shaft

Say goodbye to numb feet and hands. This engine

design allows the implementation of a lateral

balancer shaft in order to keep the vibrations to

a minimum. You know what that means: more comfort,

less fatigue, bigger smiles.





The KTM 250 EXC TPI employs the KTM-developed DDS

clutch (damped diaphragm steel) with a wear-free steel basket,

extremely heat resistant clutch plates and new, nitrated steel liners.

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.



Exhaust system

This nickel-plated pipe is produced by WP Performance

Systems. It is taken over from the carburetor model

and designed for an optimal power band and maximal

performance of the engine. A modern 3D production

process guarantees top precision and reliability of the

pipe, so this screamer is as tough as it is strong.



Throttle body

The TPI engine is fitted with a newly developed throttle

body made by Dell`Orto. It features a diameter of 39mm.

The airflow is regulated by a butterfly connected with a twin-cable

throttle cam, which is operated by a new handlebar throttle assembly.

A throttle position sensor provides airflow data to the control unit,

while a bypass screw allows the regulation of the idle speed.

The cold start device also opens a bypass supplying more air.

Via an oil intake tube oil supplied from the oil pump is mixed with

the incoming air to lubricate crankshaft bearings and cylinder/piston etc.




The TPI models are fitted with a stronger generator delivering

196 W (the same as their EXC 4-stroke brothers) to meet

the needs of the engine management system in terms of energy

supply. The new regulator is taken over from the EXC-F models.



Engine management system

The engine management system (EMS) of the TPI

models features a new control unit located below the seat.

The control unit determines the ignition timing and the amount

of fuel to inject is based on several sensor readings such as intake and

ambient air pressure, throttle position, oil and water temperature.

Thanks to altitude and temperature compensation the rider

does not need to worry about fiddling around with the jetting anymore.





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

the 2018 KTM EXC models are the slimmest, lightest dirt bikes out there.



Air filter box

The air filter box design offers maximum protection of

the air filter against soiling, while ensuring maximum airflow.

The EXC TPI models get a new intake snorkel designed for the

new throttle body while also hosting an air temperature sensor.

The large Twin Air air filter is mounted on 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.



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. The additional KTM

PowerParts radiator fan that riders can add to this fuel injected

2-stroke is now regulated by the control unit, no thermo switch is required anymore.

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.





Sophisticated ´No Dirt´ footpegs prevent smudging up

the pegs, even when digging in deep ruts. The pegs on the Enduro

models are 6mm higher than the ones used on SX models,

which benefits ground clearance. But you can swap them at will.



Fuel tank

This is a lightweight polyethylene tank with a capacity of

9.25 liters. The EXC TPI models incorporate a new integrated fuel

pump system and an additional fuel level sensor so you’ll

always know when you’re running low on gas.





KTM engineers sure know how to handle handlebars.

This tapered one, made of high-strength aluminum by

NEKEN, features a throttle assembly, which now has

a twin-cable for EXC TPI models just like their 4-stroke brothers,

with a new double-cable aluminum body and straightforward free-play

adjustment. A volcanized grip sits on the right, while on the left

side of the bar a comfortable ODI lock-on grip is mounted, which does

not require any wire or glue to be fixed. All models can retrofit optional

ignition curve switches at the handlebar for the selection of an

alternative map, so you can be fully prepared for any condition.




The EXC wheels feature lightweight, CNC machined

hubs and high-end Giant rims guaranteeing maximum

stability at minimum weight. The wheels are fitted with

MAXXIS tires – perfect for surefooted performance off-road

and stability on-road.




KTM R&D, KISKA Design and the factory racers 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 EXC TPI.

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. Clever brake hose

routing on the front number plate prevents wear and tear.




New graphics convey the READY TO RACE character

of the 2018 KTM EXC model line.





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 engine head stays (the connection between

cylinder head and frame) contribute to a reduced vibration level.

Two threaded inserts in the lower cradle tubes allow for safe

fixation of an optional skid plate. The engineers could 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. On the EXC TPI models the upper frame tube

features a slot where the oil filler cap is mounted, which feeds the oil

tank via a hose inside the frame tube. The bike also features an extra-light

subframe made of stable aluminum profiles, which tiptoes the scales at less than 900g.





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.




Rear suspension

The PDS is kind of a KTM trademark where the shock absorber is

directly connected to the upper side of the swingarm. This setup

boasts the best possible mounting geometry and provides amazingly

progressive damping. The shock absorber is mounted close to the centerline,

which means nearly symmetrical loads for the swingarm and frame and

more space for the exhaust system. A second piston works together

with a closed cup (instead of a needle) towards the end of the stroke

and is supported by a progressive shock spring for exceptional bottoming

resistance. Various machined and anodized components and a distinctive WP

color trim make this a valuable, high-end product compared to the less

refined shock absorbers of the competition.




Front suspension

The WP Xplor 48 upside-down fork is a split fork developed by

WP in close collaboration with KTM. It is fitted with a spring on

both sides but features separated functions for each fork leg: compression

damping is fitted on the left side, while rebound is on the right. The forks

can easily be adjusted for compression and rebound with the twist of a

dial on the top of the forks. New outer fork tubes and a reworked

setting make for more sensitivity, improved damping behavior and a

reduced weight. In addition, a sealed hydro-stop guarantees

excellent resistance to bottoming-out. Due to high-quality

materials and a state-of-the-art production process, the new

WP Xplor 48 fork – with approx. 300mm of travel – has outstanding

response and damping characteristics. A comfortable preload adjuster can

be retrofitted and allows for a simple spring preload setting

in three steps without tools (standard, +3mm, +6mm).




Triple clamp

Fitted with forged triple clamps with an offset of 22mm,

ensuring a solid grip of the fork and precise handling. The

handlebar is adjustable forwards and backwards over 4

positions, so the EXC TPI will fit you like your favorite gloves.



You couldn’t brake any harder, better, faster or stronger.

These high-tech Brembo babies are combined with lightweight

Wave brake discs and are the ultimate solution in braking

technology. First you outrun them, then you outbrake them.









Design 1-cylinder, 2-stroke engine
Displacement 249 cm³
Bore 66.4 mm
Stroke 72 mm
Starting aid Kick and electric starter
Transmission 6 speed
Primary ratio 26:73
Secondary ratio 14:50
Clutch wet multi-disc clutch, Brembo hydraulics
EMS Synerject


Frame Design Chrome-molybdenum steel central-tube frame

Rear suspension

 WP Xplor PDS shock absorber
Suspension travel (front) 300 mm
Suspension travel (rear) 310 mm
Front brake Disc brakes

Rear brake disc diameter

220 mm

Front brake disc diameter

260 mm

Rear brake

Disc brake

Ground clearance

370 mm
Wheel base 1482 ± 10 mm

Steering head angle

63.5 °
Seat height 960 mm

Tank capacity (approx.)

9 l
Weight READY TO RACE (without fuel) 103 kg
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