Motorcycle Repair: leaking inside primary cover, o ring, tranny

Question
need something to seal leak on inside primary thats against the engine and the tranny

Answer
You have two places that the inner primary can leak. The o-ring where the inner primary attaches to the motor and the trans seal where it attaches to the trans. If either one is leaking you are going to have to remove the inner primary and replace the seal and o-ring. There is nothing you can put in the primary to stop the leak
Good luck and happy riding
Mike