KTM sent out a media blitz about their new 2011 model line-up. Yes there are changes to the two-stroke line-up and they look really good, but we have some photos of the 250SX from the National Motocross race in Czechoslovakia. Extra special thanks to Jiri Tyrk for taking these photos.
The bike in the photos is one of the 2011 250SX prototypes and was raced by Stefan Zieglers.
For years KTM has committed to the development of 2-stroke engines which are an advantage against 4 strokes in many aspect. Unbeatable is the power-to-weight ratio, lower cost of acquisition and maintenance, and simple to service and rebuild, which allows a piston change without having studied engineering.
News MY 2011:
• new chassis (PDS)
• new airbox
• air flow optimised intake boot between filter and carburettor
• new exhaust (new shape, bigger diameter at connection pipe)
• new two component rear silencer (better connection, bigger inner diameter)
• newly developed cylinder (lower exhaust port, new timings, optimised exhaust control)
• noticeable increase in power performance
• higher torque
• better rideability
According to KTMs philosophy Design follows function, the engineers put highest priority on rider ergonomics. And in this respect Stefan Everts took a key roll during the entire development process. Who could know the needs of a motocrosser better than a 10 time MX world champion? From the first clay model till the final product Stefan was heavily involved with each step of the development and he really pushed the design team of Kiska until every single detail was addressed in order to get the ideal shape of a future champions bike. The results are super slim ergonomics and a bodywork with excellent contact points between rider and machine. He also insisted on having a wider and 50 mm longer rear fender. And not to forget features like the no-tools access to the air filter or the incorporated lift handle in the outer rear fender, which is well protected against dirt from the rear wheel.
Why PDS for the 2-strokes?
The directly linked PDS shock has turned out to be the best solution for the 2-strokes. 2-Strokes have a totally different engine characteristic than 4-strokes and also a different centre of gravity. Many tests have proven that the PDS rear suspension fits better to the lighter and more nervous characteristics of the 2-strokes. With the lighter PDS system, the 2-strokes will keep a major weight benefit, also in the future.