For adults and heavier kids, this heavy duty fork damper kit is a perfect upgrade. Bottoming out on the brakes? Added a spacer, thicker fork oil, or more of it? You likely found out that stiffening up the front end on your NSR50 or NSF100 helped, but the forks now act like pogo-sticks. Inexpensive upgrade from Kitaco, this fork damper kit has adjusted orfices to slow down compression and rebound for heavier and more aggressive riders.