2011 KTM SX model lineup

KTM 350SX-F highlights 2011 line

By Motorcycle.Com Staff, May. 18, 2010, Photography by Mitterbauer H
KTM has unveiled its 2011 motocross lineup, featuring the new 350SX-F with link rear suspension.

The 350SX-F is the star of KTMs 2011 lineup. Developed by ten-time Motocross World Champion Stefan Everts, the 350SX-F has already made a splash in the FIM World MX1 Championship, with factory rider Tony Cairoli riding the bike to two Grand Prix wins and first overall in the standings.

The 350cc DOHC single-cylinder engine uses a 57.5mm stroke and 88mm bore. According to KTM, the 350SX-F offers the performance of a 450cc MX bike with the handling of a 250cc motorcycle. The KTM 350SX-F also features electronic fuel injection and electric start. The 350SX-F can also be retro-fitted with a kick-starter.

The KTM 350SX-F is said to offer the performance of a 450 but the handling of a 250.

The 350SX-F uses a similar chassis to the rest of KTMs 2011 off-road lineup including the 250SX-F and 450SX-F.

The 2011 models get a new lightweight chrome-moly steel frame KTM says offers higher torsional stiffness and reduced longitudinal stiffness than the previous frame while also absorbing the energy from hard rear wheel impacts.

A stripped-down look at the 350SX-F. Note the linked rear suspension system.

The 2011 two-stroke SX models will use PDS rear suspension system while the four-stroke SX-F models will use WP linkage rear suspension. According to KTM, the PDS system provides a more linear spring progression than the linkage system, making them a better fit for the two-stroke models. The linkage system has a high spring progression which benefits motocross and supercross conditions. Regardless of PDS or linkage suspension, all 2011 SX models will use a new cast aluminum springarm. Up front, all 2011 SX models will be equipped with 48mm WP upside-down forks.

KTM has changed the layout of the airbox for 2011 models to better protect against dirt and improve airflow.Four-stroke models will use a new silencer that reduces noise levels to 115 dB. Two-stroke models will use new two-component silencers with an injection-molded plastic holder around the aluminum housing. KTM has also updated the airbox layout to better protect the air filter and maximize airflow.

The KTM 250SX-F receives engine updates for 2011 to take advantage of the updated intake port and exhaust. According to KTM, newly developed cams help improve torque. The 250SX-F will enter serial production with a kick starter but can be retro-fitted with an electric starter. The KTM 450SX-F also receives minor engine updates.

The 2011 models are expected at KTM dealers in June.

For more pictures, check out our photo gallery.

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