OMC Evinrude Johnson Transistor-ORing

The OMC Evinrude Johnson transistor o-ring is a rubber gasket, typically black, designed to create a tight seal between two mating surfaces, such as the transistor housing and the engine block. It helps prevent leaks and ensures proper electrical conductivity. The o-ring is a factory original equipment part, not an aftermarket replacement.

Here's a more detailed description

Material: Rubber

Color: Black

Purpose: To seal a tight fit between two parts, preventing leaks.

Application: Used in various OMC Evinrude Johnson engines, including those with transistor ignition systems.

OEM Factory original equipment, not aftermarket

For example, some OMC Evinrude Johnson O-rings include the following

Cylinder Head O-Rings: Used to seal the cylinder head.

Intake manifold O-rings Used to seal the intake manifold. 

Shift Rod O-rings Used to seal the shift rod.