Just looking at the KX article in the latest VMX and read how it was converted to rising rate
Back in 1982 White Brothers sold a kit to do this consisting of billet parts. They called it the Kawasaki Action Arm
KX 125 & KDX 175 uni-track – part number WB793
KX 250/420 & KDX 250/420 uni-track - part number WB79
So that’s just a few trick aftermarket parts for KX/KDX owners to hunt for