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KTM's youth two-stroke motocross and cross-country bikes, from the automatic 50s to the big-wheel 105s.
2001 – present · 50cc · 2-stroke
New steel frame with a height-adjustable two-piece subframe and WP XACT AER fork.
Completely new chassis and engine for 2009; cast-aluminium swingarm added in 2020.
1998 – present · 65cc · 2-stroke
New steel frame with fibreglass-reinforced subframe and WP XACT AER fork.
2003 – present · 85cc · 2-stroke
Completely new frame, subframe and swingarm; updated engine.
2004 – 2011 · 104cc · 2-stroke
Revamped chassis for 2010, matching the 105 XC redesign; end year not found.
2008 – 2009 · 104cc · 2-stroke
105 SX engine in a cross-country chassis.
2008 – 2023 · 49cc · 2-stroke
Small-wheel (12/10 in) version of the 50 SX that replaced the 50 SX Pro Junior LC; no platform change found over its run.
2002 – 2005 · 49cc · 2-stroke
One generation until research dates a platform change.
2008 – 2009 · 85cc · 2-stroke
One generation until research dates a platform change.
The liquid-cooled automatic 50 carried over from the 50 SX Pro Senior LC under the new 50 SX name.
New, more powerful engine for 2009, with PCEV exhaust control and a 35mm USD fork by 2011.
Original 65 SX; details of this period were not confirmed.
New engine and new lighter frame and subframe for 2018.
moto.it: completely reworked frame, new chassis and more powerful engine for 2013; not cross-checked.
Lower boundary is the launch; whether 2013 is a true platform change rests on one source (below).
Start moved to 2004 (catalogue and motorcycle.com 2004). 2006 was a major revision per Motorcyclist, so 2004 may be its own generation. The 2010 boundary rests on totalmotorcycle's 2010 pages only.
Single-year first version (air-cooled per motorcycle.com); whether it shares the 2009 platform was not established.