You might want to get it sold in no more than a month, but that depends upon the general public wanting to buy something immediately...which in this economy isn't happening. I would say hold onto it for a little bit, because you're certainly not going to get the price you want. In fact, you might take a beating on it if you push forward with the sale. And speaking of the sale, in the main question you ask "is this a decent price for a suzuki quadsport z400"? but now in the main paragraph you're asking how much can I get for it if I want to sell it that quick? You never wrote in the price you were asking for, or the work you did to it. And forget about a dealer doing a trade-in, they'll beat you down even more than a private buyer right now. They can't even move their own inventory!