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The 450 SX-F is a KTM designed to win; it draws its potential from a large-displacement engine and a perfectly adapted chassis. For the official KTM factory team, the 450 SX-F is the first choice for the AMA championship. It’s no wonder the compact SOHC engine and innovative fuel injection technology deliver raw but easily controllable power.. The 450 SX-F stands out from other big 4-strokes in terms of performance and handling. Ideal for motocross enthusiasts who primarily want high torque and enough power while maintaining good handling.
Wheels
When it comes to wheels, the 2015 version features black coated Excel rims with CNC machined lightweight hubs and spokes with lightweight aluminum nipples, to ensure maximum stability at minimum weight. The new Dunlop Geomax MX 52 tires were designed in collaboration with the KTM USA factory team and offer optimal traction and top performance. The new crowns save another 50 grams on the unsprung masses.
Brakes
High-tech Brembo brakes have long been standard on KTM off-road motorcycles with lightweight wave disc brakes for optimum braking performance. Best brakes in their category in motocross, they remain unchanged on this 2015 version.
Motor
The compact 60 HP powerhouse with an overhead camshaft and all-new electronic fuel injection is characterized by unmatched performance and even more efficient power delivery. On the 2015 version, new oil screen seals ensure better resistance even in extreme conditions as well as greater durability..
Electric starter
Like all KTM 4-stroke motorcycles, the 450 SX-F ignites at the push of a button. It is especially in the heat of the motocross action that the electric starter becomes an invaluable advantage..
Cylinder head
In the engine cylinder head of the 450 SX-F, an overhead camshaft controls four ultralight titanium valves via the extremely robust, DLC-coated rocker arm on the intake side. This configuration allows speeds above 11,500 rpm and contributes significantly to the unique performance of the high-displacement KTM engine..
Piston
The 95mm bore cylinder accommodates an extremely lightweight forged piston in the Box-in-Box design; its light weight contributes greatly to the low level of vibration and the high speeds supported by the engine. The compression ratio is 12.6: 1.
Linkage
The 450 SX-F’s crankshaft, with 63.4 mm of travel, is fitted with a sliding bearing in the bottom of the connecting rod eye. Two pressed bearings are directly connected to the crank pin of the crankshaft. the pressurized lubrication of the motor ensures the oil supply to the bearing. This construction is essential for the high revs and impressive peak performance of the 450 SX-F engine. Another decisive advantage for customers is the extended service intervals for the crankshaft thanks to the sliding bearing..
Balance shaft
The laterally placed balance shaft also serves as a drive for the water pump. Thanks to the perfect balance of the masses and the low moving masses of the engine, it has been possible to limit its vibrations even at maximum speeds..
Clutch
The engine of the 450 SX-F features a DDS (Damped Diaphragm Steel) clutch developed by KTM with wear-resistant steel housing and extremely heat-resistant friction surfaces. This construction is distinguished by the use of an elastic washer instead of the usual spiral springs, which significantly reduces the force to be applied. The spring washer leaves room for the integrated shock absorber hub: an advantage in terms of grip and durability. Brembo’s hydraulically operated clutch ensures easy modulation and easily controllable.
Gearbox
The engine of the 450 SX-F is fitted with a lightweight 4-speed gearbox specially adapted to the characteristics of this large-displacement engine. In the US market, the 450 SX-F is fitted with a 5-speed gearbox which is a bit heavier but better suited to the requirements of US customers..
Engine Management System (EMS)
Keihin’s Engine Management System (EMS) with electronic fuel injection, 44mm throttles, as well as the revolutionary injector position developed by KTM, ensure spontaneous reaction and maximum engine performance. Many connectors in the wire harness are now protected against steam by rubber sleeves. The Map-Select-Switch available in the PowerPart catalog also allows different motor characteristics to be selected via the EMS. In addition, an optional User-Setting-Tool allows the use of a laptop computer to access motorcycle data and modify the ignition and fuel injection mapping in just a few clicks..
Framework
The modern frame design of the SX models made of lightweight, high-strength chrome-molybdenum steel profile tubes combines maximum longitudinal stiffness with optimum torsional rigidity. On the new SX 2015 frame, a forged and milled cross tube connects the two frame halves and the draw rod of the idler mechanism. The absence of welds allows for extremely precise manufacturing tolerances and increased safety while saving 60 grams in weight.
Return mechanism / shock absorber
Redesigned for this 2015 model year, the damping system has a new return mechanism with optimized geometry. A more linear progression with a higher starting rate ensures increased stability while lowering the rear. In addition, this new design saves another 40 grams. Fully adjustable, the WP 5018 shock absorber has been perfectly optimized for this new return mechanism.
Triple trees
High-quality CNC-milled triple trees have been incorporated into the standard KTM equipment for years. They ensure precise handling and clearly underline the flex characteristics and therefore the responsiveness of the telescopic fork. New lower fork crown bearing O-ring bracket, overhauled tube and new steering head screw save another 40 grams.
Fork
The fully adjustable WP Suspension upside-down fork has been perfectly matched to the rear shock absorber as well as the new 22mm front axle (up from 26mm so far) for the 2015 model year. The new axle provides better performance. sensations at the level of the front wheel while also reducing the weight by an additional 40 grams. The new front wheel axle mountings only have a 33mm offset instead of 35mm, providing better stability with a higher caster angle. They also include new fork protectors that are 50 grams lighter..
Graphics
A new, more stylish graphic kit with clear lines underlines the uncompromising requirement of this modern off-road motorcycle.
Fairing
The aim of the KTM designers was to create a more ergonomic and functional fairing, so that the whole bike in every detail is in perfect harmony with the rider. The molded plastic parts of the front mudguard are a model of solidity thanks to their sophisticated structure and attachment.
Saddle
Perfectly ergonomic, the saddle contains a resilient foam core which provides greatly increased comfort and greater robustness..
Air box
The airbox design guarantees optimum protection of the air filter against dirt, and maximum airflow for increased performance. Changing the Twin Air air filter in seconds and without tools has long been standard at KTM.
Handlebar
All SX models are fitted with a super robust Renthal Fatbar 827 tapered handlebar, the shape of which has been adapted to the demands of motocross. The proven KTM system allows the handlebars to be fixed in four different positions. The 2015 model has been fitted with softer two-component grips to preserve the rider’s hands.
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Replaces
450 SX-F 2014
Model marketed in
2012
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2014
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2019
2020
The technical aspect
2015 KTM 450 SX-F
- Frame
- Frame: Central tubular frame in chrome-molybdenum steel
- Tank: 7.5 liters
- Seat height: 992 mm
- Wheelbase: 1495 mm
- Dry weight: 105 kg
- Train before
- WP inverted telehydraulic fork Ø 48 mm, deb: 300 mm
- 1 disc Ø 260 mm, 2 piston caliper
- Front wheel:
80/100
– 21
- Transmission
- 4-speed gearbox
- Secondary chain transmission
- Rear axle
- Mono-shock, deb: 317 mm
- 1 disc Ø 220mm, 1 piston caliper
- Rear wheel:
110/90
– 19
- Motor
- Single cylinder
in line
, 4 stroke - Cooling: by water
- Injection Ø 44 mm
- 1 ACT
- 4 valves
-
449.30 cc
(95 x 63.4 mm) -
60
ch - Weight ratio /
power
: 1.75
kg / hp - Compression: 12.6: 1
- Crit’air:
Detached pieces
exhaust
motor
fluid
electricity
filtration
braking
chain kit
Competitors
Suzuki RM-Z 450 2015
Yamaha YZ 450 F 2015
Kawasaki KX 450 F 2015
2015 Honda CRF 450 R
Gallery
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