- All pistons are heat-treated with a T-5 hardening and tempering cycle
- All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life
TM -- EN 250 -- (1997, 1996, 1998, 1999); TM -- MX 250 -- (1997, 1999, 1998, 1996); Gas Gas -- EC 250 -- (2011, 2013, 2010, 2014, 2009, 2015, 2008, 2012, 2003, 2004, 2006, 2007, 2002, 2005); Rieju -- MR Racing 250 -- (2021)