well i know people are using raptor, 300ex, and i have even heard of banshee shocks being used on the 85. i dont think a piggyback ressy will work though on the 86 seeing is how there is less space on the swinger where the bottom shock connects and the dogbone bolts upto the swinger. get a raptor shock with the remote ressy, i think like a 01 raptor or something liek that, where you can route the ressy to the frame somewheres. might have to change out the hose for it to the longer t3 one, and get it recharged, but would work im sure.
1985 KXT 250 Tecate - kx cylinder, kx ignition, bassani headpipe, answer silencer, v-force reeds, 38mm airstyker carb, +2 franks swinger, raptor rear shock.
1996 YSF240 Blaster - maxxed out!!!
Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting "HOLY SH-T, what a ride!"