Take it out the top.
Quite right. Just pull the head off and the rod will allow it to move forward enough to push the pin out.
Here below are a couple pictures to guide you.
I will also mention that since the trimming of one winding off the governor spring in the finial it is better to replace it with a softer spring.
Have fun!
Gil
To remove the head to get at your piston.... First remove the bolt with the blue arrow pointed at it. [ Guests cannot view attachments ]
For working on the governor.... [ Guests cannot view attachments ]