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When maximum horsepower is needed, there is no other choice but the 450 SX-F. This model has proven itself over the years in major championships around the world. Thanks to its compact SOHC (Single Overhead Camshaft) engine, which delivers explosive yet controllable power, it is the weapon of choice for the official US KTM factory team and 2015 AMA Supercross Championship winner Ryan Dungey..
Motor
With new features including significantly more compact dimensions, improved performance across the entire rev range and a weight saving of 1.8 kg, this new engine is the lightest 450 in the motocross market. Equipped with a redesigned single overhead camshaft cylinder head and the latest electronic fuel injection system, it is distinguished by unmatched power of over 62 hp and extremely efficient power deployment..
Cylinder head
Inside the new cylinder head which features an improved water jacket and combustion chamber, the flow of fuel through the optimized ports is controlled by a new overhead camshaft. It operates four ultra-light titanium valves using ultra-stiff rocker arms coated with a DLC coating on the intake side. This configuration makes it possible to achieve an engine speed of 11,500 rpm. The cylinder head also has a weight saving of 350 g compared to the previous model thanks to its compact design..
Cylinder and piston
The improved and shortened 6mm cylinder, with an optimized water jacket and 95mm bore, encloses an ultra-light box-in-box piston and a lightweight piston pin which contributes significantly to the low level of vibration and at high engine speed. Compression is 12.6: 1.
Crankshaft
The 450 SX-F’s crankshaft has 10% greater inertia (without any increase in weight) and uses a shorter connecting rod than the previous model, contributing to the compactness and lightness of the engine and its responsive character. A higher balancing factor reduces the level of vibration. The big end bearing has two force-fitted half-bearings acting directly on the crankpin, and the oil supply is provided by the engine’s pressurized lubrication circuit. This general concept provides the customer with longer intervals between overhauls..
Balance shaft
In order to balance mass forces, the new 350 SX-F engine uses a multifunctional balance shaft that drives the water pump and the timing chain at the same time. It is equipped with new crowns mounted on the new timing chain.
Electric starter
Like all KTM four-stroke motorcycles, the 450 SX-F is started at the push of a button. Using an electric starter has proven to be a huge advantage time and time again, especially in competition.
Engine housings and cover
The completely new design of molded crankcases provides a much more centralized shaft configuration, allowing the crankshaft to be raised 7mm and retracted to bring it 9mm closer to the bike’s center of gravity – a weight reduction of 550g for a final weight of 27.3 kg (EU) and 27.8 kg (USA). New magnesium engine covers feature an advanced surface structure to reduce wear caused by rider boots.
Engine management system
The completely redesigned Keihin electronic fuel injection engine management system features a new 44mm throttle body offering spontaneous response and maximum performance through a revolutionary injector position. The new ECU (Engine Control Unit) includes a cranking control function to improve starting efficiency and provides different configurations depending on the selection of the gear switch engaged. Using the selector on the handlebars, the rider can also activate an optional configuration for a different power curve.
Clutch
The 450 SX-F uses a DDS (Damped Diaphragm Steel) clutch developed by KTM with a wear-free steel clutch housing and clutch plates that offer very high heat resistance. This 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 enough room for a damping system integrated into the clutch hub, providing better traction and longevity.
Gearbox
The new 450 SX-F engine uses an ultra-light 4-speed gearbox that offers the same gears as the previous model, perfectly matched to the power delivered by the large-displacement engine. In addition, the 1st and 3rd gears now receive a special surface treatment offering greater reliability. For the US market, the 450 SX-F comes with a 5-speed gearbox to meet the demand of US customers who use motorcycles on faster circuits and for desert rides..
Lightening
The main objective of the KTM engineers during the development of the new generation SX was very significant weight reduction and improved handling. With a weight reduction of between 4 and 5 kg, the result is exceptional, making the new KTM models the lightest motorcycles on the market, and this although the four-stroke models are equipped as standard with a very beneficial electric starter, while competing models must be kicked off.
Fork
The new KTM SX models feature a revolutionary new ultra-light WP fork, a 48mm inverted air spring fork developed by WP Suspension in close collaboration with KTM. This is a split fork with separate functions for each fork leg. Damping functions are on the right, the air spring is on the left. The left fork leg houses an air cartridge. The air spring is easily adjusted for the weight of the rider using a single valve and standard fork air pump. The right fork leg features a new cartridge specifically designed to meet the demands of the single damping arm design, and the damping can be adjusted to suit track conditions or rider preference with a simple twist. button. With approximately 300mm of travel, the new fork offers exceptional response and excellent, consistent damping characteristics. It also achieves a weight saving of 1.4 kg compared to the previous model.
Triple tree
High quality CNC machined triple trees have been a hallmark of KTM for years. Allowing precise steering, they significantly enhance the flexibility characteristics and, thus, the action of the fork. For 2016, the upper triple clamp features a new handlebar clamp rubber damping system to reduce the level of handlebar vibration. Triple trees maintain front-to-rear adjustability to rider preference.
Mono-shock absorber
The new generation of mono-shocks manufactured by WP Suspension have been designed for the new SX models, together with the new frame and swingarm architecture, the modified linkage and the new WP fork. The linkage system has also been reworked, with modified geometry and extended pull rods, and was tested last season on most KTM factory bikes..
Air box
The new design of the air box provides optimum protection of the air filter against clogging and maximum air flow. The new intake snorkels feature a weight saving of 300g and are made of a new material (reducing deformation due to air intake impulses) improving performance. As on previous models, the new dual air filter allows easy and safe fitting, and can be changed in seconds without tools – an original KTM standard feature.
Battery and wire harness
As in the past, all SX-F engines are equipped with the proven electric starter – a KTM exclusive and a major advantage in motocross racing. For 2016, the SX-F range succeeded in integrating an ultralight and compact 495g lithium-ion starter battery on a standard motocross, allowing a safe start and a weight saving of 1 kg compared to 2015. !
Brakes
High-tech Brembo brakes have always been standard equipment on KTM off-road motorcycles. They are combined with redesigned, lightened wave-type discs with improved thermal resistance manufactured by GALFER. The ultimate solution in braking technology. Weight reduction of 63 g at the front, 32 g at the rear.
Wheels
The 450 SX-F features ultra-light CNC machined hubs, premium Excel rims, new lightweight spokes and aluminum spoke heads that provide maximum stability at minimum weight. Dunlop’s new MX tires (Geomax MX 32) were developed with the KTM racing team in the USA based on factory tests and the racing experience of seasoned riders. They guarantee perfect traction and exceptional performance.
Framework
The new frame design offers approximately 20% greater torsional stiffness, approximately 30% lower longitudinal stiffness, and features redesigned engine mounts to reduce vibration. This gain in flexibility allows a better absorption of the energy generated by the loads of the front and rear wheels, assisting the suspension for a gain in comfort and a reduction in pilot fatigue. 0.4 ° greater steering angle and 10mm shorter wheelbase help improve handling, as well as 380g lighter weight compared to the predecessor model.
Footrest
A new “zero dirt” footrest concept prevents dirt from jamming the footrests when they are brought back into position, even in deep ruts. The new footrests are also wider and more stable, offer better grip and are lighter than previous models..
Swinging arm
As on previous models, the new generation SX is equipped with a new cast aluminum swingarm. The new one-piece molded swingarm offers reduced weight and optimized flex behavior enhancing damping characteristics. Weight gain is 250 g.
Dressing
For the new generation of SX models, KTM factory riders collaborated on the design of the exterior with KTM R&D specialists and Kiska Design. The goal was to achieve perfect harmony between the rider and the bike, down to the smallest detail. The result: new plastics offering perfect ergonomics and contact points for the rider, maximum freedom of movement, a saddle lowered by 10 to 20 mm (at the rear) and better comfort, especially at the rear. saddle.
Tank
All models in the SX range are fitted with a new ultra-light polyethylene tank with a capacity of 7 liters. The tank cap with internal thread ensures easy and reliable closing. Four-stroke models are equipped with an integrated fuel pump system.
Graphics
New modern IML graphics highlight the sporty character of the 2016 SX line-of-the-art motocross.
Handlebar
The new SX generation models are fitted with a new NEKEN tapered handlebars in high strength aluminum, mounted on a new clamp fitted with a damper gasket and offering two handlebar mounting positions.
All four-stroke models feature a new butterfly assembly with interchangeable cams for different opening characteristics, and new ODI handles with lockable mounting clamp on the left side. A selector allows you to select different configurations and activate a start control function.
Saddle
Perfectly ergonomic, the new saddle offers a greater volume of foam plastic guaranteeing comfort and longevity for the same weight as the previous model.
Cooling system
The integrated KTM cooling system routes the coolant from the cylinder head through the triangle of the frame to the new WP aluminum radiators, fitted with a new cap system and made of a more rigid alloy. Thanks to optimized internal circulation and ventilation calculated by CFD simulation, the cooling efficiency has been improved by approximately 10%. Sophisticated radiator guards provide effective protection in the event of an accident.
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Replaces
450 SX-F 2015
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The technical aspect
2016 KTM 450 SX-F
- Frame
- Frame: Central tubular frame in chrome-molybdenum steel
- Tank: 7 liters
- Seat height: 960 mm
- Wheelbase: 1,485 mm
- Dry weight: 100 kg
- Train before
- WP AER inverted tele-hydraulic fork Ø 48 mm, deb: 300 mm
- 1 disc Ø 260 mm, Brembo 2 piston caliper
- Front wheel:
80/100
– 21
- Transmission
- 4-speed gearbox
- Secondary chain transmission
- Rear axle
- Mono-shock absorber, deb: 300 mm
- 1 disc Ø 220mm, Brembo 1 piston caliper
- Rear wheel:
110/90
– 19
- Motor
- Single cylinder
in line
, 4 stroke - Cooling: by water
- Keihin EFI electronic fuel injection, Ø 44
- 1 ACT
- 4 valves
-
449.90 cc
(95 x 63.4 mm) -
62
ch - Weight ratio /
power
: 1.61
kg / hp - Compression: 12.6: 1
- Crit’air:
Detached pieces
exhaust
motor
fluid
electricity
filtration
braking
chain kit
Competitors
Kawasaki KX 450 F 2016
Yamaha YZ 450 F 2016
2016 Honda CRF 450 R
Suzuki RM-Z 450 2016
Gallery
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