Twin Air Standard Air Filter — KTM 350 LC-4 (1993-1999), KTM 400 LC — 4

Twin Air's Standard Air Filter is the dual-stage foam filter that's been the benchmark in dirt-bike air filtration for decades. Two fused layers of open-pore foam — coarse outer, fine inner — trap airborne dust, grime, and sand while keeping airflow high. Assembled by hand and inspected for fit, with model-specific molds for 1500+ motorcycles dating back to 1965.

• Dual-stage open-cell foam — outer catches grit, inner traps fine particles
• Hand-assembled and inspected, with a greaseless sealing ring
• Washable and reusable — 30+ cleaning cycles is typical
• Model-specific fit — no universal sizes
• Drops into the OEM airbox

Fitment: bike-specific air-box fit. Drops into the OEM air-box on:

• KTM 350 LC-4 (1993-1999)
• KTM 400 LC-4 (1993-1999)
• KTM 600 LC-4 (1993-1999)
• KTM 620 LC-4 (1994-1999)
• KTM 640 Duke (2008-2010)
• KTM 640 LC4 (1993-2002)
• KTM 640 LC4 Supermoto (2008-2010)
• KTM 690 Duke R (1993-2002)
• Maico All (1998-2002)
• Mz Baghira Enduro (1997)