Make sure the multiply is AFTER the Get Right Vector, but before the Launch Character.
To make it choose right or left, pull a Select node out of the Jump Direction pin, and for the Left direction you multiply the Right Vector by -1 before multiplying by the 5000, but for the Right direction just use the 5000 without also multiplying by -1. Alternatively you could just choose either 5000 or -5000 to multiply by. Comes out the same.