Honda Z50 and early CT70 have similar front suspension. All the components are the same, except the fork legs (Chrome Part) are different .The early Z50 (K1 & K2) without rear suspension (Hard Tail) have different headlight mounting ears than the CT70. The Z50 K0 has no headlight.
Please check your parts manual for specific model parts detail.
Triple tree top is held by two bolts and a big nut. After removing the big nut and the bolts, the top can be removed.
Disconnect the wiring harness to the headlight.
After removing the top, remove the nut that holds the triple tree to the frame neck. Carefully remove the top bearing race, use a magnet to collect the roller balls on top and bottom.
Complete front end assembly.
Lower the rubber boots to expose the aluminum cap nut on the lower part of the fork leg.
Usually the cap nut come off easily. If the nuts are tight, you can use the special nut wrench. If nothing works, you may have to use a Dremel Tool to cutoff the cap.
Both fork legs disassembled.
The top of the fork assembly with the spring, is attached to the bottom part with a steel roll pin.
Use a piece of wood with a hole in it to remove the dowel. Use a punch to tap the steel roll pin out.
The top and bottom parts separate with the steel pin out. Always use a new steel roll pin when reassembling the forks.
Separated top and bottom internal fork assembly. Check the spring length, replace if out of tolerance. If ok, use your favorite method to clean the old grease off before reassembly.
All the parts needed to complete the reassembly.
Re Chromed Legs, Painted fork Top, Polished Cap Nuts, and lots of new parts.
The new oil seal goes on the inside of the screw on cover. Just like any other seal, the flat surface goes on the outside, to keep the grease in.
Next goes the plastic slider. The end with the wide flat edge, goes towards the oil seal.
Join the top half to the bottom fork leg. Make sure the pins on the top match the fork assembly slots. The right leg top pin faces left, and left top pin faces right. See photo below.
Slide the boots on first.
Slide the cover with the oil seal on to the fork leg.
Use multipurpose grease on the whole assembly.
Even though, these pieces were not used in the Z50 forks, I install them to keep the suspension tight. These go tight against the upper fork assembly, and minimize side to side movement.
The pins on the top of the fork legs match the slots on the top fork assembly. A good idea to check before joining the top and bottom fork half.
Completed show quality front fork assembly
Check early CT70 Parts list for these sliders