I am going to opt out on this one since I have never seen one with this setup as far as the arrow and two lines. Once I opt out it will open it up for other experts to answer. I would like to help you, but I do not want to mislead you.
Someone must have the Honda engine manual. This is a rubber belt driven plastic timing gear that the cam is mounted on. I have tried to find a manual but have been unsuccessful.
Here is a diagram to set timing.