Malcolm, you need to open the top cap and turn forks upside down. On coil side this will drain most of the oil. On dampening side half of the oil will be inside cartridge and it need be disasembled to drain oil.
Have Tech forks on a 2015 motorcycle. I completely disassembled the forks and changed oil 11 months ago. Do I need disasembly and clean it again or just opening the cap and draining old oil and putting new is ok?
Which oil you prefer? 5w or 7,5w?