ATVSource.com | Calendar | ATV/UTV Forums | ATV/UTV Reviews | ATV/UTV News | ATV/UTV Product Reviews | ATV/UTV Racing | ATV/UTV Trails | ATV/UTV Videos

Articles
ATV Bone
Machine Reviews
Press Releases
Product Reviews
Racing
Trailheads
Videos
Manufacturers

» Arctic Cat

» ATK/Cannondale

» Can-Am

» E-Ton America

» Honda

» Kasea

» Kawasaki

» KTM

» Polaris

» Suzuki

» Yamaha

ATV Clubs
Calendar
Classified Ads
Forums


 

By: ATV Source
Video By: ATV Source
Photos By: ATV Source & Kinny Jones

2009 KTM 450 and 505 SX, Two Stellar "Ready To Race" ATVs

Continued from page 1...

Chase Cunningham, a Media Allstars Team Rider and 2008 GNC 25+ champion, and a GNC A class (top 5) front runner.
Chase Cunningham
It wouldn’t be a KTM without a hydraulic clutch and the new SXs deliver on the tradition by coming equipped with MAGURA hydraulic clutch units with stainless steel braided lines and quick-change clutch covers. Yes, they’re maintenance-free, and we can report that they pull in effortlessly and offer automatic adjustment. Sweet!

A single oil supply lubes the engine, clutch, and gearbox and these beasts have optimized dry sump designs for the increased oil capacity unique to ATVs. Plus, we maintenance- dreading types can take comfort in the easy access oil filter design. Japanese OE’s take note! Both machines are cooled by curved aluminum radiators fitted with an electric cooling fan with thermostatically-controlled operation (plus the curvature improves the quads’ ability to funnel in more air for better cooling).

Some may be surprised to hear that in the era of fuel injection, KTM has decided to stick with carburetion to deliver the fuel through Keihin FCR-MX 41 mm flat slide carbs with accelerator pumps and throttle position sensors. Additionally, each comes standard with a unique air box design with a specially designed snorkel that allows for increased air intake when the engine revs call for it most. Plus the design draws air from the highest point of the machine to reduce the intake of water and mud. Best of all, the quick release seat and tool-less air box lid means effortless air filter service.

As is becoming the very welcomed trend of late, KTM has equipped its SX series quads with a stock exhaust system that has been typically considered the domain of the aftermarket.  Each will come graced with a performance-tuned header pipe and modern SX aluminum silencer (with integrated filter to meet modern sound requirements rated at 92db.

Holding all of the magic together is a lightweight and powder-coated (wow!) Chromoly steel chassis derived from the company’s proven competition designs. This chassis places the engine deep for a low center of gravity and an optimal swing arm pivot to countershaft position. The main members may be chromoly bits, but the sub frame is aluminum with removable rear grab bar.  In addition to the fact that KTM made the sub frame easily detachable, they wisely saw to it that none of the electrical (CDIs, modules, wires, etc.) attached directly to it to save time and hassle.

Chase Cunningham, a Media Allstars Team Rider and 2008 GNC 25+ champion, and a GNC A class (top 5) front runner.
Chase Cunningham
Up front we find chromoly steel SX A-arms provide a 49.8 inch width with adjustable caster/camber. This results in superior handling for the rough and tumble environment of closed-circuit competition. The upper arms fitted with adjustable (replaceable) Heim joint bearings as are the lower needle bearings and upper/lower ball joints replaceable. The industry-exclusive suspension package comes in the form of fully adjustable WP piggybacks with high/low speed compression, preload, and rebound adjustments. Dual rate springs with adjustable crossover results in an impressive 9.6 inches of front wheel travel specifically designed for Motocross applications.

Around back we find an overbuilt chromoly steel swing arm with eccentric chain adjuster and chromoly rear axle with high-quality tapered roller bearings that are easy to lubricate.  When compared to its XC siblings, the SX models offer a new shock anchorage point for motocross application with an additional 10 mm of shaft travel.  Just like with the XCs, KTM included the awesome adjustable axle width feature (from 47–50 inches to compensate for track conditions). The rear axle nut is self-locking for quick tire changes.

WP Progressive Damping System (PDS) single shock with preload, high and low speed compression, and rebound adjustment. Industry exclusive dual rate springs with adjustable crossover. The linkage-less design allows for reduced weight, maximum ground clearance, and less pivots to maintain. All told these quads boast 10.4 inches of fully adjustable rear wheel travel.

Like the clutch, KTM spec’ed Magura hydraulic brake systems. Up front we have 4-piston fixed calipers with 180 mm discs vented for cooling and cleaning capability and are fitted with an adjustable lever with an integrated break point and lightweight parking brake. The rear offers a single-piston floating caliper, large 200 mm brake disc, and a master cylinder with integrated reservoir. Interestingly, these brakes are produced by MAGURA exclusively for KTM.

Previous 1 2 3 4 5 Videos Next


Share This Talk About This In Our Forums