I recently found out that my 2003 Roadking is one of many bikes built that has a roller bearing in the left side engine case. Prior to this Timken tapered bearing were used. The reason H-D went to the roller bearing was to save time (and money) while building the engines. I understand econimics, but they certainly didn't do the end consumer any favor by doing this. Now I have to tear my engine completely down and take the left engine case to Zipper's and have them machine and fit the Timken tapered bearing. The cost for this repair is about $350.00. Apparently the roller bearing can not handle the side loading and fails. I noticed it when I had to replace my shifter arm on the transmission and had to drain my primary fluid. It was not only black (usually it's slighly cloudy) but there was more in there than I had put in. It leaks from the engine into my primary. That is the first sign , the second is a whining noise from the primary and if left unchecked long enough it will egg out the opening. Thanks H-D    

Make sure your crank is checked for run out before its reassembled. There is now an insert being sold so the left case no longer need machining to have the bearing installed. Seriously consider having your crankwelded if you plan on making any horsepower with your new motor