It is unlawful for any motorboat to be equipped with any motor or propulsion machinery beyond its safe power capacity, taking into consideration the type of construction of such vessel. Where the manufacturer of a vessel has specified the maximum safe horsepower for a particular boat, such maximum shall be considered the limit of safe capacity for the purpose of this chapter. The responsibility for not overloading or overpowering any vessel shall be with the operator of such vessel. (Ord. 427 (part), 1976).