Trigger Mercury Mariner 2 Cylinder | CDI 134-3960-2 CDI Electronics Mercury Mariner 2 Cylinder Trigger | 134-3960-2 Replacement trigger for 30 HP & 40 HP Mercury/Mariner outboard engines from 1998-2006. CDI Electronics outboard trigger Fits Mercury and Mariner 30 HP 2 cylinder engines from 1998 to 2006 with serial number range 0G590000-0T979999 Fits Mercury and Mariner 40 HP 2 cylinder engines from 2000 to 2005 with serial number 0G590000-0T999999 CDI determines the most common causes of component failure and designs their replacements to be better than the original Replaces Mercury 853960T and 855747A1