hey i have a 2003 yamaha yz 450f . tried the clutch lever mod works good. but the clutch arm actuator mod using a 99 clutch arm actuator does not work. it requires a different cable mount so lever can operate properly. this mod probably works on 426 but the 450 s all have the same length lever actuator. i have a 2003 2004 and 2006 450. the 2003 pulls much harder than the other two. the other mod i tried was the gytr clutch kit its ten times worse. its even harder to pull clutch in i verified with yamaha factory. they indicated it was harder to pull. just straight info for you guys looking for reliable info. p.s. i went to a stock clutch plates after spending a fortune on what i thought was good info on this site . rather dissapointed in some forum threads not too reliable.