The USMCA maintains the tariff-free trade provisions for most goods among the three member countries.
Under the USMCA, the general rule is that goods produced within North America can be traded between the member countries without additional tariffs or duties.
In the case of a Canadian purchasing a Harley Davidson motorcycle from a San Francisco dealership near Pier 39 and bringing it back to Halifax, there shouldn't be any extra charges in terms of tariffs or duties under the USMCA. However, it's worth considering other factors such as transportation costs, import/export documentation requirements, local taxes, and any potential fees associated with registering or licensing the vehicle in Canada. It's always a good idea to consult with relevant authorities or professionals to ensure compliance with all applicable regulations and procedures.