The bulk of your oil volume is in the tank.  It will drain completely up-right or on side stand.  The sump only has something like a quart and a half in it.  (provided the bike has not been sitting un-started).  Since most Gen 1 Rockets have 2 sump drain holes most of the sump oil should come out on the side stand.  There will always be a little of the old oil left in the engine.  Don't sweat it.  No need to be OCD here guys.


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