Mark Tilley stretches the throttle
cable on the 2012 KTM 250SX.
The 2012 KTM two-stroke motocross machines have landed with another model added to the lineup: the 125SX. It’s not a new model; it just wasn’t available last year in the U.S.
Now there are two 125 two-stroke MX machines to choose from—the YZ125 and the
KTM125SX—if your pleasure is holding it wide open and fanning the clutch. Also in the KTM
two-stroke motocross lineup is the 150SX and 250SX.
The SX two-smokers now have linkage with a higher geometrical rising rate for better progression and a new WP shock. The shock is 490mm with a stroke of 136mm, while last year’s
non-linkage PDS length was 417mm and had a stroke of 108mm. With the new linkage and
shock comes a new frame and swingarm to accommodate the linkage. The SX two-strokes
also received a new cylinder head-stay/engine bracket. The WP closed cartridge forks
received new settings, seals and bushings for less friction. A new intake boot boosts
response and power, while the 150SX and 250SX received new exhaust pipes. All KTMs this
year have a new Brembo rear master cylinder for better reliability.