There's not a law about that specifically, but you could bring a civil suit (probably in small claims court) to force them to either allow you to use the motorcycle or pay you your share of it so that they own it outright.
Not lock
It is a motorcycle
A motorcycle handle bar law limits the height or position of the handle bars. For example, in Florida, the handle bars may not be higher than the shoulders of the operator of the motorcycle.
That is the law in the UK. It may be different in other countries.
Motorcycle license
2003
There is no minimum age requirement to be a passenger on a motorcycle in PA. The only law is that a child must wear an approved helmet.
As long as you are riding the motorcycle in the state. Helmets are required by Minnesota law.
Yes, it must be mounted on the rear of the motorcycle in plain view.
Yes, there is a law in NC requiring a license plate on the motorcycle. Without this a person can receive a ticket and pay a fine.
Yep it is
1979