I am also a original owner of a 1977 Honda CB 550 F. I only have slightly over 10,000 original miles. I have been riding motorcycles since I was 12. Now I ride my 550 for pleasure and to work now and then. Its very dependable. Very few problems. Its in very good condition. Recently I noticed I was leaking fuel from an overflow on one of the carburetors. I believe it may be a problem with the float or needle valve. I havenĀ“t taken it apart yet to repair it. (soon) Any incite would be appreciated.