RadiusX 4.0 Clutch - Husaberg/Husqvarna/KTM RadiusX 4.0 Clutch Kit Updated EXP (expanding friction disk) assembly Base material updated to provide better strength in high temperature environments, critical for the heat clutch systems create Internal wall bases redesigned for strength and rigidity, which helps translate to a more connected lever feel for the rider On the outside of the EXP disk, friction pads now match proprietary friction design found on Rekluse TorqDrive clutch plates, this design helps match oil flow characteristics on the clutch pack beneath, promoting improved cooling capability and consistent operation EXP 4.0 wedges have been improved to now use rolling contact with built-in pins Rolling pins versus sliding creates less friction and resistance, providing smoother engagement and a more responsive feel, creating stronger power delivery overall More direct power delivery, improved durability, and rider-focused functionality Engagement curve designs updated to better match modern motorcycle engine characteristics More tuning options with varying wedge weights and EXP springs Fitment:

Vehicle Type	Model	Years
Offroad	Husaberg FE450	2013-2014
Offroad	Husaberg FE501	2013-2014
Offroad	Husqvarna FE450	2014-2016
Offroad	Husqvarna FE501	2014-2016
Offroad	Husqvarna FE501S	2016
Offroad	KTM 450 XC-W	2012-2015
Offroad	KTM 500 EXC	2012-2015
Offroad	KTM 500 EXC Six Days	2012
Offroad	KTM 500 XC-W	2012-2015