Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

It is a double acting piston valved engine >The trick is the wee bit on the end of the crank just a disc with two pins and when the fore/reverse goes from one way to tuther the arm pushes the engine over the dead center allowing it to restart. It was an idea I first came across in a Model Engineer mag around the mid 1950s on a single cylinder wobbler
I doubt youre crank shaft ported engine will reverse but you could simply swap inlet over to exhaust to see what happens .Just with an airline would prove it
Keep plodding on
cheers