I have a 1980 sportster , it has front dual disc brakes , a 8,000 rpm tack ,no red line , I have turned it up to 7500 rpm before , a 150 mph speedo , I have seen over 120 mph on speedo before . I am trying to find out what is specal about this bike all parts are factory it has 64000+ miles never had motor a part , I have been rideing this bike sence about 1985 , I would be greatful of any inforemation i can get on this bike , mike