STARTER MOTOR 31100-87J00

Function and Technical Context

The starter motor is the electrical component responsible for starting the outboard motor when the ignition switch is turned on, transmitting the necessary rotation to the engine flywheel to initiate the combustion cycle. It operates within the electric starting system, receiving power directly from the boat’s battery and mechanically engaging with the engine’s ring gear via a Bendix pinion. A failure in this component renders the boat completely inoperable, as without a functional electric starter, it is impossible to start the engine. This unit is compatible with Suzuki outboard motors in the DF40, DF50, DF60, and DF70 series, as well as with Johnson and Evinrude motors in the E70 and B70 series, and is identified by part numbers 31100-87J00, 31100-87J10, 31100-87J11, 31100-87500, 31100-99E00, 31100-99E10 (Suzuki), and 5030780, 5031457, 5032433 (OMC/Johnson/Evinrude).

When should this part be replaced?

The most common symptoms of a faulty starter motor are: the motor turns slowly or with difficulty when the ignition is turned on (sluggish start), clicking or popping sounds are heard without the motor turning, the pinion does not engage properly causing a metallic squeal, or there is simply no electrical response despite the battery being in good condition. This type of component does not have a fixed replacement interval based on operating hours, but it should be inspected during every seasonal maintenance check, especially on boats exposed to saline environments where corrosion can degrade the contacts and internal bearings. Replacing it preventively at the first signs of trouble prevents being stranded at sea without a starter, a situation that can lead to costly on-water assistance.

Compatible Johnson/Evinrude Engines

Equivalent Manufacturer Part Numbers