01. Engine & Exhaust
The 2022 KTM 450 SX-F FACTORY EDITION is powered by a lightweight but heavy-hitting brute of an engine. Punching out massive HP, but weighing in at only 59 lb (26.8 kg), this SOHC powerplant is the undisputed champion of holeshots. For 2022, the engine has been rotated 2 degrees backward, resulting in a 3 mm lower front sprocket position. The benefits? Dramatically improved mass-centralization for easier handling and maneuverability and better anti-squat behavior.
Redesigned to be lighter and more compact, this SOHC cylinder head uses a shorter profile, locating the camshaft closer to the center of gravity. This together with parallel frame mounts significantly improve handling and agility, while four ultra-lightweight titanium valves - 40 mm for the intake and 33 mm for the exhaust - are activated via extremely rigid rocker arms, which are DLC coated on the intake side. A new valve cover reduces the number of mounting screws needed to only 2, while a single oil spray jet guarantees efficient cooling to further save on weight.
The crankshaft on the KTM 450 SX-F FACTORY EDITION is located in an ideal position close to the center of gravity, utilizing a short connecting rod, allowing for snappy power delivery. The entire construction is extremely well-balanced, with the perfect amount of inertia for optimal traction and rideability. This design also enhances durability, allowing for longer crankshaft service intervals - resulting in less effort in the pits, and more time on the podium.
Crankcases and engine covers
All-new engine cover designs feature a textured surface for greater wear resistance and a slick new look thanks to its black finish. A high-pressure die-cast production process keeps the overall weight to a minimum, but optimizes mass-centralization and increases efficiency. A new steel oil pump gear and repositioned oil jets increase the overall oil pressure, resulting in improved overheating resistance and durability.
Thanks to a redesigned Pankl Racing Systems 5-speed transmission, the KTM 450 SX-F FACTORY EDITION really shifts! With a focus on durability and reliability, a revised 29:72 ratio, and a weight-optimized shift shaft, operating force is reduced making for smoother, slicker shifting. But for really fast up-clicks, a new Quickshift sensor allows clutchless upshifts and can be toggled on or off via the new QS handlebar switch. A new gear shift lever design also prevents dirt build-up and keeps the lever tip in its original position even in the toughest conditions.
Engine management system
A state-of-the-art KEIHIN engine management system, with electronic fuel injection and 44 mm throttle body, ensures fuel is used as efficiently as possible with maximum power as a result. The injector position guarantees optimal atomization of the fuel and air on the way to the combustion chamber, resulting in instant throttle response and thanks to the repositioning of the air filter box, more mid-range grunt too.
Cylinder and piston
The 95 mm bore cylinder houses a lightweight CP piston, made to the very highest standards and stress levels. Its design contributes to the big 4-stroke's low vibrations and overall engine speed. Due to the low oscillating masses, the engine is not only powerful but also displays extremely lively characteristics, smoothly rocketing out of corners, while an increase in compression to 13.1:1 adds more shove to the top end performance.
The multifunctional side-mounted balancer shaft masterfully balances all the oscillating forces, while also driving the water pump. It effectively keeps engine vibrations to a minimum, resulting in the smoothest ride, even at the highest engine speeds.
The 2022 KTM 450 SX-F FACTORY EDITION features an updated DDS clutch, a single diaphragm steel pressure plate instead of traditional coil springs, and an integrated damping system. The clutch basket is CNC milled from a single block of steel that allows the use of thinner steel liners and is a major contribution to the compact engine design. The benefits? Better traction and durability, improved clutch cooling, reducing clutch fade and heaps of gains in the trophy department.
The standard electric starter on the KTM 450 SX-F FACTORY EDITION uses a proven starter drive and a strong electric starter 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. A new, combined start/stop switch on the right side of the handlebar allows for easy and intuitive firing up.
Just like a championship contender, a high-performance race weapon also needs to stay cool under pressure. Thankfully, a set of radiators ideally positioned for a lower center of gravity, ensure this machine keeps it's cool. By using computational fluid dynamic technology together with a clever cooling circuit routing, the innovative system ensures the optimum engine temperature for the highest performance, no matter what the conditions.
When it comes to power delivery and performance, the exhausts on all KTM SX-F FACTORY EDITION models feature a model-specific header with an advanced Flow Design resonance chamber and a short, compact aluminum silencer that stays well within noise regulations. The header joining position and new, standardized mounting points and screw lengths across the 4-stroke exhaust systems design also allows the exhaust to be disassembled without removing the shock absorber, saving time in the pit lane, and gaining it out on the track. In this case, we'll let the sound do the talking.