If it is just leaking a little, remove the primary cover. Push the stator plug into the primary housing. Clean the plug and hole it goes into with brake cleaner. Apply black silicone to the outside of the stator plug and push back into the hole. Replace the primary cover, and after the silicone is dry, refill the primary. If oil is leaking alot, and the bike is a Twin Cam, check to make sure vent hose on the trans top cover isn't plugged. Twin Cam primaries vent through the trans and if the vent hose is plugged, oil will be under pressure in the primary and force itself out around the stator plug.
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