I had to replace the battery in my 04 Piaggio BV 200 this spring. When I did I noticed that the odometer had re-set back to 0 and was in kilometers now.
I've finally gotten around to asking my dealer how to re-set it back to miles as I couldn't find the answer anywhere in the owners or shop manuals.
1. With the key off press and hold the mode button down
2. Turn the key on
3. It should switch it over to miles from kilometers or vice versa I guess
It had 1,700 miles on it before the battery died and now it shows something like 250 km.
And Piaggo says to pull the main fuse if you're not going to ride it for 20 days.