The 2023 KTM 250 EXC-F SIX DAYS features the smallest engine in the KTM
4-stroke SIX DAYS line up, but make no mistake – this is no flyweight.
While it might boast a lightweight chassis, it makes use of an
impressive fuel-injected powerplant that offers class-leading
performance, buckets of torque, and confidence-inspiring power delivery.
Most importantly, however, it gets the job done. The only thing left to
say, then, is RACE ON!
Compact dimensions with class-leading power output, the KTM 250 EXC-F’s fuel-injected DOHC engine is the most powerful and refined 250 cc on the market. Its efficient power delivery is available throughout the entire rev range and with its low weight of only 27.9 kg, this engine is the lightest and most competitive powerplant out there. With Euro IV homologation, it’s not only considerately green, but leaves the competition green with envy too.
The KTM 250 EXC-F SIX DAYS engine is fitted with a compact DOHC cylinder head for optimal mass centralization. The head configuration promises efficient power delivery and unrivaled performance. A single overhead camshaft also ensures optimal gas flow, with low-friction rocker arms and timing chain guides guarantee consistent performance throughout the rpm range. The DLC coated finger followers, as well as the lightweight titanium valves they actuate – intake 32.5mm, exhaust 26.5mm – allow for higher engine speeds.
The KTM 250 EXC-F SIX DAYS crankshaft is located in an ideal position close to the center of gravity, contributing to easier handling. It utilizes a short connecting rod, which makes for an overall compact and lightweight engine with a snappy power delivery. A plain big end bearing with two force-fitted bearing shells runs directly on the crank pin. The engine’s pressurized lubrication system provides the necessary oil feed for this bearing.
CRANKCASES AND ENGINE COVERS
A lightweight engine case design allows for a very centralized shaft configuration while contributing to an efficient centralization of mass. Additionally, the engine covers feature a smart surface structure that reduces the wear caused by the rider’s boots, keeping them looking as fresh as the day it rolled off the production line, while a reinforced clutch cover and engine guard mean the engine case is more robust.
The KTM 250 EXC-F SIX DAYS features a robust 6-speed transmission made by PANKL Racing Systems. The gears are made of a strong, forged raw material, ensuring the highest durability and reliability level. All four-stroke engines are fitted with a gear sensor, giving the option of different engine characteristics for each gear.
ENGINE MANAGEMENT SYSTEM
The state-of-the-art Keihin Engine Management System, with electronic fuel injection, features a 42 mm throttle body with separate systems for cold starting and idle adjustment. The throttle cable mount also allows for easy access and a smooth routing of cables for crisp throttle response, every time.
CYLINDER AND PISTON
Inside the short cylinder, with a bore of 78 mm, 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. The compression ratio of 13.8:1 delivers an exceptional engine performance and reduces the risk of engine knocking.
The KTM 250 EXC-F SIX DAY makes use of a side-mounted balancer shaft, which does three jobs. It maintains low oscillating masses and reduces engine vibration, drives the water pump, and drives the timing chain.
The KTM 250 EXC-F SIX DAY is fitted with the extremely durable, KTM-developed damped diaphragm steel – or DDS – clutch with a wear-free steel basket and heat-resistant clutch plates. It uses a diaphragm spring instead of the usual coil springs, which results in considerably easier clutch action. Additionally, the Brembo hydraulic system provides easy and precise clutch modulation throughout the entire operating temperature range.
The standard electric starter on the KTM 250 EXC-F SIX DAYS uses a proven starter drive and a strong starter motor made by Mitsuba. As demonstrated time and time again, it provides quick and reliable starting, saving you precious time and energy when you need it most.
Keeping the engine cool when the going gets tough comes courtesy of a pair of radiators, mounted close to the center of gravity. These make use of CFD technology (Computational Fluid Dynamics) and clever coolant circuit routing, achieving optimum engine temperature for the highest performance, in all conditions. Above all, the delta distributor, integrated into the frame triangle, features a large center tube for highly efficient coolant flow, as well as radiator fans as standard on all 4-stroke models.
Packing a punch and delivering an unmistakable engine note, all 4-stroke KTM SIX DAYS models feature an easy-access two-piece header pipe that can be disassembled easily to allow access to the rear shock. An aluminum muffler sleeve has a short and compact profile, which also proudly displays the SIX DAYS logo.
All KTM SIX DAY models feature high-tech, lightweight Chromoly steel frames with race-derived geometry, optimal stiffness, and unparalleled feedback for the rider. This translates into a playful handling character, with remarkable stability at speed – not to mention FACTORY RACING style thanks to the striking orange coating. The subframe is made of extra-light and ultra-stable aluminum profiles, weighing less than 900 grams providing rear fender stability and durability in the event of a loop out.
The KTM 250 EXC-F SIX DAYS features a one-piece aluminum swingarm, which is manufactured using a gravity die-cast production process. This results in exceptional strength at the lowest possible weight and the perfect flex behavior.
KTM uses lightweight, CNC-machined hubs and high-end GIANT rims on all KTM SIX DAYS models. These guarantee maximum stability and the bare minimum weight, while aluminum spoke nipples feature an innovative design, which reduces the need to continuously tighten the spokes. They also look the part with unique SIX DAYS branding.
Leading the way in enduro-focused suspension, these adjustable 48 mm diameter WP XPLOR upside-down forks provide unmatched performance from both expert and amateur riders alike. Adjustability also comes easily, with compression damping dialed in on the left fork, with rebound on the right.
The race-proven and fully adjustable WP XPLOR shock absorber features conical bushings between the pistons that allow for reduced suspension fade and wear. And, not only this PDS rear suspension design the of choice of champions in the quest for podiums, but it also leads the way when it comes to providing maximum traction for the rear wheel.
All Six Days models are fitted with high-end CNC machined triple clamps anodized in orange and 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 bike will fit you like your favorite gloves.
High-tech Brembo brake calipers and lightweight wave brake discs ensure you stop when you need to. Thanks in part to a floating front brake disc and solid rear disc, brake fade is minimized and allows for harder braking, more of the time. For additional strength and reliability, the rear brake pedal is secured with a safety wire.
All KTM enduro models are fitted with lightweight polyethylene tank, with a ¼-turn bayonet-style filler cap makes for quick and easy operation. The integrated fuel pump ensures a direct feed to the injectors, while a 90° connector provides protection against damage. The tank is also manufactured using see-through plastic, riders are able to gauge fuel levels at a glance and on the go.
The easy-access airbox on the KTM 250 EXC-F SIX DAYS ensures optimal flow dynamics, thanks to specially designed intake snorkels. This means air is force-fed into the motor, resulting in the perfect balance of power and throttle response. Keeping the air clean, is a large Twin-Air air filter fitted to a rigid cage for ideal placement at all times.
All KTM SIX DAYS models are equipped with adjustable, high-strength aluminum tapered handlebars, that can be mounted in four different positions. Standard with ODI vulcanized grip on the right side and a comfortable ODI lock-on grip on the left, your only worry is hanging on, and letting rip.
It goes without saying that six days spent in the saddle require a certain level of comfort. For that reason, the KTM 250 EXC-F SIX DAYS features a softer, grippier seat, finished in a blue and red colour combination.
Self-cleaning footpegs prevent mud from clogging up the pegs, even when dragging them through deep ruts. This means your boots maintain their grip, and you maintain your focus on the trail.
SIX DAYS EQUIPMENT
All KTM SIX DAYS models receive the full SIX DAYS treatment, meaning they benefit from an exclusive parts package, ranging from machined orange anodized triple clamps to a solid rear brake disc. Not to mention an assortment of parts emblazed with the SIX DAYS logo – there is no mistaking a KTM SIX DAYS for anything else.
Vive la France! The 2023 KTM SIX DAYS models fly the French flag in celebration of the 96th edition of the International Six Days Enduro (ISDE). And, as always, the decals are applied using in-mold graphics which feature greater friction and fade resistance, keeping your SIX DAYS machines looking as fresh as ever.
BATTERY AND WIRING HARNESS
The KTM 250 EXC-F SIX DAYS is fitted with a proven, reliable electric start system. Powered by an ultra lightweight 2 Ah lithium-ion starter battery, it provides a safe, reliable starting time and time again, while the wiring harness has most of the electrical components carefully positioned under the seat for easy accessibility.