2006-2009 Honda TRX250EX/TRX250X Service Manual, Page 39Get this manual
GENERAL INFORMATION SERVICING THE HONDA U.S.AOnly
Maintenance, replacement or repair of the emission contro devices and systems ay be performed by any ATV repair establishment or indiv idual using parts that are "certified" to EPA standards
PROHIBITED ACTIONS
The following prohibitions apply to everyone with respect to the engine's emission control system You may not remove or disable any device or element of design that may affect an engine's emission levelsThis restriction applies before and after the engine in placed in serviceVehicles that are used only for competition are exempt from this prohibition