Enhanced piston pin oiling slots, radial boss machining, and annular grooves for improved wrist pin lubrication Lightweight piston with a tight piston wall clearance for a quieter running engine Skirt coated for reduced friction and improved break in performance Ring land treatment for improved ring seal and oil control Double bridged forging design where noted Kit includes piston, rings, wrist pin and pin locks - Beta 525 RR 4T (2005, 2009, 2006, 2008, 2007); KTM 520 EXC Racing 4-Stroke (2000, 2001, 2002); KTM 525 XC ATV (2009, 2008, 2012, 2010, 2011); KTM 525 EXC Racing 4-Stroke (2003, 2005, 2004, 2006, 2007); KTM 525 EXC-G Racing 4-Stroke (2005, 2006, 2004); KTM 525 MXC-G (2003, 2004, 2005); KTM 525 SMR (2004, 2005); KTM 525 SX Racing 4-Stroke (2003, 2004, 2006, 2007, 2005); KTM 520 EXC (2002, 2000, 2001); KTM 520 SX Racing 4-Stroke (2001, 2002, 2000)