In reply to robbo99:
I am sue the guys at the Shop in Tha Khao village would rent out some gear for you. They have plenty of ropes and draws there for guiding.
If not, then hire stuff in Tonsai and take it over to Koh Yao with you.
Personally, I'd rather take my own stuff for climbing over there. Take plenty of draws to Koh Yao - some long pitches.