MOPED ARMY

That hole you see on the inside of the engine is supposed to be there it is an oiler port that only leads from the back of the crank to the transfers. Totally engineered to be there. Sorry you seized your cyl. Such is the cost of pushing the limits of your engine. You could try salvaging your cyl but unless you use a honing tool it will not allow the piston to reat correctly. You will also need to get a larger bore piston for the now larger cyl bore.