Johnson Evinrude 2 Cylinder Timer Base | CDI 133-3387Replacement trigger sensor for 4 HP to 60 HP Johnson Evinrude outboard engines from 1977 2005. Johnson Evinrude 2 Cylinder Timer Base CDI 133 3387 CDI Electronics outboard optical trigger sensor Fits various Johnson Evinrude 4 to 60 HP 2 cylinder engines from 1977 2005 2 wire sensor CDI determines the most common causes of component failure and designs their replacements to be better than the original Replaces BRP Johnson and Evinrude 583387, 584716,