"I cant ride a painting, its just art.. "
Why would you want to?
And I must take exception to the phrase "just art". Art is what makes us different from the other animals on the planet.

Also, the motorbike was built for a purpose. If it is not being used for that purpose, it looses it's value in relation to that purpose. If it is made into a sculpture (just to be looked at) it looses value because more than one, probably many, identical "sculptures" were made, and looking at a rusty, dilapidated version is not what the builder intended.
So it should be restored.