http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWNX%3AIT
I got one of these. Thought I would risk it. I actually got it to cover one of my garden tractors.
My initial impression is that the fabric is very lightweight. Like a tent. It is at least water resistant. I took the bag and it held a puddle of water.
How will it hold up outside is what I will need to find out. If it does okay I may get more for other tractors. The black is better than blue tarps and it fits around better.
I think if you keep you bike in the garage and want a dust cover this is a good deal. Not sure how it will hold up out in the elements yet.