The low oil sensor is that big black plastic box that goes up into the bottom of the engine case, and has the yellow, and green wires coming off of it. It's about two inches around. You can't miss it. It's on every Honda GXH50 that I've ever seen. I've unhooked the wires, but I would rather do away with it all together, which should give room for a couple more ounces of oil.
Now, about that plate, and those springs. Any info on those?