White bike - overexposed on the front panel. See how it's completely washed out?
White bike - exposed correctly. See how the shadows show on the white panels? I have more trouble taking pictures of this bike that aren't burned on some portion of the bike. I'd imagine that your bike, with even greater expanses of white is even harder to get a good exposure for. I've learned to park this bike under a tree if I want even a hope of getting a good shot. The shadows will allow the camera to find an exposure that works for the whole scene.
Marin County, CA
Some bikes. Some with motors, some without.