Starter Motor

This component is responsible for spinning the engine via the flywheel or flex plate, which is necessary for fuel injection and combustion to begin. Starter motors are generally robust and built for a long service life, but like any part, they can eventually fail. Symptoms of a failing starter can include the engine not turning over despite a full battery charge, the starter engaging but not spinning the motor, the starter continuing to spin after the engine starts, or a grinding noise during attempted startup. This particular Bosch starter motor (part number 12411720664) is an OE-quality replacement made in the United States. It features a 1.7kW power rating and a 9-tooth gear, compatible with Bosch systems. It directly replaces OE numbers 12411720664 and 12411720663, and manufacturer numbers SR441X and 0986014897. This starter is designed for specific BMW models including the 535i, 535is, 735i, 735iL, and M5, covering various model years from the late 1980s through the early 1990s.