i have a 1980 1100 what other year 1100 engines will fit my frame.and does anyone know where i can get a used motor low miles great running.my 1st gear is gone and valves are tapping and i have no way of knowing miles in this engine,also what would be a estimate to rebuild motor i have? THANKS GOD BLESS AND SAFE RIDING AND WHERE IS A REBUILDER IN SOUTHEAST I,M IN ALABAMA