in 10 years, since the PV800 series ceased production in 1958. 1969-1971 models were equipped with dual Zenith Stromberg 175CD2SE constant-depression carburetors . In 1972, Bosch 's first volume-production electronic fuel injection system, D-Jetronic , [ 2 ] was offered as optional equipment. Carburetors were dropped and "D-Jet" became standard equipment