Would that 10cc (.61) engine be a two cycle engine? If it is then it will be a bit much for that plane. A 10cc four cycle will also be a bit much. I have the Hanger 9 80" Cub and it flies great on a .52 4 cycle and a friend has a .50 4 cycle in his.

The engine will be a bit heavy, but most Cubs need the nose weight as they have long tails that need to be balanced. I will geuss that it will fit inverted, but a large 2 cycle muffler will cause more problems -- assuming the engine is a 2C...

Having the 10cc will make it a bit heavier, but I don't think a Cub will be too bothered as it has a lot of wing. It also may not fly that much faster... If you prop it right you can keep the speed down and increase the thrust. Also, a Cub is not a sleek machine so it will only go so fast before the drag exceeds the extra power...