hate to tell yo this, but you are gonna have to find a smaller crank shaft for the engine. 1 1/8 clutches can be tricky to find and I've never seen one bigger than that. 1" is the common size. I wouldn't dare try to turn a crank down that far, as you will end up turning all of the heat treat off, and getting into the soft metal toward the center of the shaft
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.