If you feel comfortable pulling the head off and can torque it properly back down, pull the head. Check for damage. If you want to be a little braver, pull the cylinder, but careful not to damage the base gasket. If there is any damage, pack it up and sent it to a shop. At this point, it doesn’t make sense to just hone the cylinder and put a new piston and ring in. There might be issues with the bottom end of the motor, the lower end of the rod, the crank or crank seals. I assume you do not have the tools or expertise to open the crank case. A failure in the bottom end could be fatal for the engine.
There are many good kt-100 builders up here in the north, including mine, but you probably don’t want to spend the money to ship it. Try calling TS racing in Homestead. Not a very long drive for you.
LAD Specialties customer / tony kart / rotax / kt100