Yes the oil will gravity feed out of the tank and into the crankcase. Disconnect the line on the bottom of the engine.Now make sure you put a little oil back in the tank.The oil will come out of the crankcase vent when you start the engine.. Be careful how much oil you put back in it cause it will return a little bit of it. If you do not drain the oil out it will go into the carburetor or throttle body depending what fuel delivery system you have and it will make a huge mess. That's the way Harley designed it for the E.P.A. to keep the oil off of the ground. I hope this was informative.
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