Introducing the 2009 KTM 450SX and 505SX

Official Press Release from KTM
The KTM 450 SX and 505 SX Sport ATV‘s were built with one thing in mind: motocross. Ready-to-Race, these motocross sport ATVs feature the most powerful engines and sophisticated suspension elements in the industry. High performance, great handling, supreme quality and styling are what make the new KTM 450 SX and 505 SX race machines the most desirable on the market.

 

450 Engine

449cc DOHC 4-valve liquid cooled
Bore 97mm, Stroke 60.8mm
Compression Ratio 12.5:1
Electric start w/ hot start

505 Engine

477cc DOHC 4-valve liquid cooled
Bore 100mm, Stroke 60.8mm
Compression Ratio 12.5:1
Electric start w/ hot start

Motors are based off the 450 SX-F dirt bike engine:
Engine Cases
Re-designed engine cases with modified engine ventilation system.
Accommodates a deep oil sump allowing better engine performance and increased oil capacity.
Transmission
Close ratio 5-speed transmission
Provides the right gear for all track conditions. No reverse.
Cylinder Head
Engine design offers 4-valve and DOHC.
Excellent power band and high performance output.
Carburetor
Keihin FCR-MX 41mm flat slide carb with acceleration pump and TPS.
Ultra responsive and easy to tune.
Suspension
Industry-exclusive fully adjustable WP piggyback suspension elements with hi/lo speed compression, preload, rebound and crossover height adjustments on both front and rear shocks. Tuned for motocross.
Wider, adjustable chromolysteel dual A-arms produce superior motocross handling by achieving 50-inch gold standard width. A-arm shock mounting location identical to XC models.
Adjustable rear axle width from 47 –50”depending on race conditions.
Highly desirable, extremely durable and light weight chromolysteel swingarmwith new shock mounting point designed specifically for motocross.
Highlights
2.7 gallon fuel tank, ergonomically designed for MX racing. Includes on/off switch with no reserve equipped with ¼turn quick release fuel cap.
Lightweight DWT aluminumrims with rolled edge and rear beadlock, 8-inch wheel.
Race ready MaxxisRazrsoft comp tires with aggressive MX tread design, 4-ply rating. 21×6-10 front and 18×10-8 rear tire sizes.
Seat height trimmed 14mm for lower centerof gravity and optimal MX race ergonomics.
Steering stem 10mm taller for ideal MX ergonomics.
Nerf bars, headlight cover come standard.
California Green Sticker legal.

 

The shootout dominating KTM 450 XC and 525 XC models return for 2009 with several updates.
Highlights
Thumb throttle turned forward 10°for improved ergonomics.
New plastic bolts in order to economize aluminumbushings.
Redesigned seat cover for optimal comfort and feel.

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