Engine, primary, or transmission? Primary case drain is on the left side at rear lower part of primary case. Can be an allen or a star nut. Transmission drain is on the right side, under transmission. Engine will also be on right side just forward of the transmission drain, a little left or right. Also some H-D's have a drain hose from the oil tank that has a plug in it. If it has one of these, it will be hanging on the right side of the bike back by the tank.
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