SLO
Active member
It also makes it easier to put the piston and rings in the head. before re-assembly.You have to change the exhaust,with a smoother flow from the head.And you could not figure why it did not make a HUGE improvement. Come on! Mine has a couple thousand after I did it,and it would be my go to bike,if I did not have the Modded KTM 390 ADV