KTM’s 450 SX-F is a powerhouse in the motocross world, known for its high-capacity engine and expertly tuned chassis. This model is the top choice for the official KTM factory team in the AMA Championship, delivering brutal yet controllable power thanks to its cutting-edge SOHC engine and revolutionary injection technology. It stands out among other large 4-strokes, offering unmatched performance and handling for riders who demand plenty of torque and a smooth, controllable ride.
Engine and Performance
The 450 SX-F boasts a 60hp engine with an overhead camshaft and advanced electronic fuel injection, ensuring top-notch performance. The 2015 model features newly developed oil strainer sealing rings, enhancing durability even in extreme conditions.
Electric Start True to KTM’s 4-stroke lineup, the 450 SX-F is equipped with an electric start, providing a crucial advantage during intense motocross competitions.
Key Components
Piston and Cylinder Head: The bike features a lightweight, forged piston in a 95 mm bore cylinder, contributing to low vibration and high engine speed. The cylinder head’s overhead camshaft drives four titanium valves, allowing engine speeds over 11,500 rpm.- Crankshaft and Balancer Shaft: The crankshaft is built for high engine speed and peak power, with an extended service interval thanks to its plain bearing design. The balancer shaft also drives the water pump, minimizing vibration even at high revs.
Clutch and EMS The 450 SX-F is fitted with KTM’s DDS clutch, known for its reduced operating force and enhanced durability. The engine management system, featuring a Keihin EFI and 44 mm throttle body, ensures quick responsiveness and maximum power.
Chassis and Handling
The lightweight chrome-molybdenum steel frame offers exceptional stiffness and stability, with a new linkage system in 2015 that improves stability and lowers the rear end. The WP 5018 shock absorber has been retuned to complement the new linkage.
Suspension and Bodywork KTM’s CNC-machined triple clamps provide precise handling, and the fully adjustable WP Suspension fork is optimized for the new front axle, enhancing ride stability. The bike’s ergonomic bodywork is designed for rider harmony, with a sturdy front fender and refined graphics.
Additional Features
- Seat and Airbox: The seat is ergonomically designed for comfort and stability, while the airbox ensures maximum airflow and quick filter replacement.
- Fuel Tank and Handlebar: The 7.5-liter fuel tank is compatible with larger tanks, and the Renthal Fatbar 827 handlebar is adjustable to four positions.
- Wheels and Brakes: The bike features black-coated Excel rims, lightweight hubs, and Dunlop Geomax MX 52 tires for top performance. Brembo’s high-tech brakes, paired with wave brake discs, remain the standard in motocross.
The 450 SX-F continues to set the standard in motocross, combining power, precision, and durability in a package that meets the demands of serious riders.
Specifications
| ENGINE | |
|---|---|
| Design | Single cylinder, 4-stroke, SOHC, 4-Valve |
| Displacement | 449.3 cm³ |
| Bore | 95 mm |
| Stroke | 63.4 mm |
| Starting Aid | Electric starter |
| Transmission | 5-gear, claw shifted |
| Engine Lubrication | Pressure circulation lubrication with two Eaton pumps |
| Primary Transmission | 32:76 |
| Secondary Gear Ratio | 13:50 |
| Cooling | Water cooling, permanent circulation of coolant by water pump |
| Clutch | Wet multi-disc clutch DDS / Brembo hydraulics |
| Ignition | Contactless controlled fully electronic ignition with digital ignition adjustment |
| CHASSIS | |
| Frame | Central tubular frame made from chrome molybdenum steel tubes |
| Fork | WP Suspension Up Side Down 4860 MXMA 4CS |
| Shock Absorber | WP Suspension 5018 BAVP DCC |
| Suspension Travel (Front) | 300 mm |
| Suspension Travel (Rear) | 317 mm |
| Brake System | Disc brakes, floating brake calipers |
| Brake Discs - Diameter (Front) | 260 mm |
| Brake Discs - Diameter (Rear) | 220 mm |
| Chain | 5/8 x 1/4" |
| Steering Head Angle | 63.5° |
| Wheelbase | 1,495±10 mm |
| Ground Clearance (Unloaded) | 371 mm |
| Seat Height (Unloaded) | 992 mm |
| Total Fuel Tank Capacity | 7.5 l |
| Fuel Type | Unleaded premium fuel (95 RON) |
| Weight Without Fuel | 106.8 kg |
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