Need to know how to ask a question about my 2003 Road King. I was adviced by my back doctor to ride a motorcycle with a balaced engine. Is there a balanced engine made for my bike? It has over 100,000 miles by me. There is alot of clunking inside the engine. My mechanic says that it needs an over-haul. So I need to replace the enigine with a balaced one. Any ideas? Thanks in advance.