I have a 650 and I use a cover I bought at Wal Mart a few years ago. I just got my Burgman out of my folks barn and right now its back at my house in the drive next to the family room and the cover works fine. It will easily fit a 400 as the 650 and 400 are not that different in size. Actually, about any good motorcycle cover will work, as long as its not for a small scoot.
I've been using a CycleShell enclosure for several years. I love it because it is extremely easy to use and very fast. The one I have now is several years old so I recently called the CycleShell guy to order a new one. After three calls and one email without a reply, I ordered a new Bike Barn for about the same price. I'm not sure if CycleShell went out of business or just poor customer service. Either way, they lost my business.
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