This is MAC-911, a really cool motorcycle w/ sidecar that I saw in Antwerp. I thought it was so cool that I had to take pictures from all four angles.
Unfortunately, the pictures were taken at night, and most of them were blurry, and all of them were extremely dark. I tried to lighten them up a bit, and this is the best I've been able to do so far.
I think it really was yellow in color, but not anywhere near this yellow -- this is a result of taking low-resolution digital pictures with a cheap camphone in the dark.