I am taking the same route (basically) as a hit or miss engine. I am planning on the governor stopping the intake valve from opening, without it opening, the slave exhaust valve will stay open allowing the engine to free-wheel. I'll have to start another thread in the "Work in Progress" section and show some of the new parts I have built.
Dreeves: Adding a flyball type governor to the engine is a neat idea. I may have to go that route if my current plan fails (not that I am planning for failure
). There is plenty of room on the other side of the engine frame to add mounting for a fylball governor and possiably an additional air valve. Keep us posted as to how it is comming along.