The gross vehicle weight of any Type 1 school bus and any Type 2 school bus manufactured on or after July 1, 1970, shall not exceed 175 lb per certified net published horsepower of the engine at the manufacturer's recommended maximum governed rpm. The gross vehicle weight of any school bus manufactured after January 1, 1973, shall not exceed 185 lb per certified net published horsepower of the engine at the manufacturer's recommended maximum governed rpm.
Cal. Code Regs. Tit. 13, § 1277