Motorcycle specifications KTM250 EXC-F Six Days 2019 A bow for 6 arrows

The most accessible 4-stroke in the EXC range, like the others, benefits from a 6 Days badge. KTM SIX DAYS special editions are designed to cope with the toughest terrain and conditions. They are distinguished from the other models in the range by a higher level of equipment and a specific ISDE deco kit. The KTM 250 EXC-F SIX DAYS 2019 is undeniably the ultimate enduro weapon.

engine and silencer

for tackling the highest peaks or speeding along sandy tracks, KTM has developed a range of 4-stroke enduro bikes that are more sophisticated and faster than ever. Their great lightness and compact shape are an undeniable asset when it comes to finding the ideal trajectory in tight corners. Their enduro-tuned torque means you can climb rocky eminences with the ease of a pro.

cylinder head

the centerpiece of the compact DOHC engine, the new avant-garde cylinder head features two overhead camshafts with DLC-coated rockers designed to minimize friction. Four ultra-light titanium valves and high-flow ports maximize flow for optimum operating range, and deliver breathtaking performance throughout the rev range up to 12,800 rpm. Two side brackets have been added to secure the engine to the frame and reduce vibration.

crankshaft

the crankshaft of the KTM 250 EXC-F uses a shortened connecting rod. More compact and lighter, the engine also gains in responsiveness. The crankshaft features a connecting-rod bearing and two bearing shells press-fitted directly into the crankpin. This type of design, essential to support the very high rotation speeds of the 250 cm3 engine, increases engine longevity and lengthens the crankshaft overhaul interval.

crankcases and covers

the molded crankcase design features a centralized shaft configuration. This allows the crankshaft to be positioned closer to the motorcycle's center of gravity, which is a major factor in mass centralization. The crankcase covers feature an advanced surface structure to prevent premature wear caused by the rider's boots.

gearbox

thanks to the low-friction coating of the selector fork, the special Enduro 6-speed gearbox ensures ultra-precise shifting. The "zero-dirt" design of the selector prevents the accumulation of mud or dust in the joint. All KTM 4-stroke engines are equipped with an engaged-gear sensor that adapts the power curve to each gear.

engine management

the Keihin electronic injection engine management system features a 42 mm throttle body. Thanks to the injector's unique position, engine response is truly instantaneous. And because idle and cold start do not use the same circuits, on-site adjustment is much easier. Once the engine is sufficiently warm, simply lower the throttle to deactivate the cold-start mode.

cylinder and piston

the 78 mm-bore cylinder houses a proven bridge-box piston manufactured by CP. The geometry of the piston head, perfectly adapted to the new high-compression combustion chamber (12.8:1), is characterized by a rigid structure and reduced weight, guaranteeing the highest performance. Thanks to reduced oscillating masses, the engine climbs easily to maximum rpm.

balancer shaft

to balance mass forces, the engine uses a multifunctional balancer shaft that simultaneously drives the water pump and timing chain.

clutch

the KTM 250 EXC-F uses a DDS (Damped Diaphragm Steel) clutch developed by KTM. a wear-free steel clutch housing, heat-resistant clutch plates and nitrate-treated steel liners. This clever design is distinguished by the use of a diaphragm spring instead of the usual coil springs, giving the clutch greater flexibility. The diaphragm spring also leaves plenty of room for a damping system integrated into the clutch hub, to enhance traction and durability. The clutch is activated by a hydraulic system manufactured by Brembo, which plays an essential role in the clutch's progressiveness and flexibility.

electric starter

the KTM 250 EXC-F is equipped as standard with an electric starter, a decisive advantage when it comes to reducing lap times in competition. Operated at the touch of a button, this ultra-powerful electric starter made by Mitsuba isn't about to let you down, especially as it now features an O-ring seal capable of withstanding extreme temperatures.

cooling

kTM's proven integrated cooling system circulates coolant from the cylinder head via the frame wishbone to the aluminum radiators supplied by WP. Its incredible efficiency is due to improved management of internal airflow and advances in ventilation thanks to CFD (Computational Fluid Dynamics) calculations. Radiator guards offer the advantage of better heat dissipation. This is all the more true in the presence of mud. Integrated into the front spoilers, these radiator guards are particularly useful in the event of an impact.

six Days equipment

- Six Days saddle for optimum comfort over long distances
- Exclusive Six Days graphics in a striking design
- Handlebar-mounted power curve change knob
- Handlebars with Six Days logo
- Six Days muffler (anthracite anodized, with Six Days logo)
- Orange-anodized machined fork crowns for perfect fit and function
- Cooling fan on all 4-stroke models for optimum temperature management in extreme conditions
- Floating front brake disc for even braking in extreme conditions
- Solid rear brake disc (non-perforated) for improved thermal resistance and reduced brake pad wear
- Supersprox Stealth bi-metal rear crown with aluminum inner crown and toothed steel outer crown for unrivalled durability
- Axle puller for rapid front-wheel removal
- Orange frame
- Engine guard
- Orange chain guide

frame

the high-tech chromium-molybdenum steel frame is a model of lightness, flexibility and manoeuvrability, offering excellent stability and diabolical precision when cornering. Thanks to its high torsional stiffness and low longitudinal rigidity, this frame absorbs the energy generated by the front and rear suspensions when jumping or going over a bump. The ride is more comfortable and less tiring. The dropouts that link the cylinder head to the frame are as light as ever. Mounted laterally, they help limit vibration levels. Two threaded inserts have been provided in the lower cradle tubes to add a shoe, should the need arise. The engineers can be proud of their work, as the frame is now one kilo lighter than the lightest competing frame on the market today. Every effort has also been made to facilitate maintenance and free up space for the fuel tank and other components. The ultra-light rear section, made of stable aluminum profiles, weighs in at less than 900 grams.

swingarm

the latest-technology swingarm optimizes the position of the PDS shock absorber for even smoother entry into action. In addition to weight savings, cast aluminum is ideal for bending. The one-piece casting process eliminates the imperfections inherent in welding, guaranteeing more consistent build quality.

brakes

more responsive, more efficient and more powerful than ever, Brembo calipers are ready to face any situation. These technological gems are combined with Wave brake discs, renowned for their light weight. The stainless-steel front brake hose features effective protection and a cable guide for the speedo wire. Optimum braking power is a must when you intend to push your machine.

fuel tank

thanks to its transparent plastic, the ultra-light 8.5-liter polyethylene fuel tank lets you know at a glance how much fuel is left. To refuel, simply press the orange button in the center of the fuel cap to open the bayonet mechanism. This model features an integrated fuel pump system and fuel level indicator. The 90-degree fuel line connection further protects the fuel tank from damage.

air filter housing

the air filter housing has been designed to protect the air filter from clogging and ensure optimum airflow. The cage in which the extra-large Twin Air filter is housed is totally rigid, helping to hold the system in place. The design is so simple that you could replace the filter even with your face covered in mud. And all in a matter of seconds, with no tools required.

wheels

when it comes to wheels, KTM engineers know their stuff. Featuring ultra-light CNC-machined hubs and top-of-the-range Giant rims, the EXC-F's wheels guarantee maximum stability despite limited weight. And because they're shod with MAXXIS tires, the bike is just as comfortable and safe off-road as it is on.

front suspension

the WP XPlor 48 upside-down fork is a fork with separate damping circuits, developed by WP in close collaboration with KTM. Each fork arm has its own spring, and each has a different function: the left arm handles compression damping, while the right arm handles rebound. To fine-tune each of these settings, simply turn the knob at the top of the fork. To limit the risk of bottoming, the fork is equipped with a watertight hydraulic stop. High-quality materials, an ultra-sophisticated production process, 300 mm of travel: nothing has been left to chance to make the WP XPlor 48 fork the ultimate in responsiveness and damping. The preload ring (available as standard on Six Days models) makes it easy to adjust spring preload to three levels (standard, +3 mm, +6 mm), without the need for tools.

rear suspension

a true KTM trademark, the PDS shock absorber is connected directly to the upper part of the swingarm. As a result, engineers were able to mount it in the most appropriate position for even more progressive damping. As the shock absorber has been moved closer to the central axis, the loads exerted on the swingarm and frame are virtually symmetrical. This also frees up space for the exhaust system. The second piston, combined with a cup-shaped limit stop (instead of a needle-type one) and supported by a progressive-action spring, guarantees excellent resistance to bottoming. With its various machined and anodized components and its characteristic WP color scheme, this ultra-sophisticated shock absorber makes a strong impression compared to less well-finished competing products.

ergonomics and comfort

the race conditions and course of the annual International Six Days of Enduro (ISDE) are renowned for their difficulty. To really perform well in this type of event, it's essential to be able to move freely on the bike. That's why, for 2018, KTM has extended the READY TO RACE ergonomics of previous models, with a few judicious improvements.

handlebars

when it comes to handlebars, KTM engineers have always known which way to go. This NEKEN handlebar, with its high-strength aluminum profile, is no exception. It features a throttle response mechanism, sturdy aluminum handlebars and an ultra-simple guard adjustment system. right: an ODI vulcanized handle; left: the ODI lock-on handle, as comfortable as it is practical, thanks to its glueless, wire-free mounting system. And thanks to two interchangeable cams (retrofittable), you can adapt the throttle response to suit your riding style. With the power curve change knob (standard), you can change engine mapping and activate the traction control system for extra punch in wet conditions.

saddle

tailored to provide a comfortable support surface for enduro riding, this ultra-strong saddle allows you to tackle any terrain with disconcerting control and minimal fatigue all day long.

footrests

sophisticated "zero-dirt" footrests prevent the gear selector from getting dirty, even when riding in deep ruts. To enhance ground clearance, the gear selector on EXC models has been raised by 6 mm compared to that on SX models.

News and media credits: KTM