Trigger Mercury Mariner 4 Cylinder | CDI 134-8303-4 CDI Electronics Mercury Mariner 4 Cylinder Trigger | 134-8303-4 Replacement trigger for various 120 HP Mercury/Mariner & Force outboard engines. CDI Electronics outboard trigger Fits Force 120 HP 4 cylinder engines from 1996-1999 with serial number range E138600-E369299 Fits Mercury 120 HP model XR/XR2 SportJet 4 cylinder engines from 1995-2000 with serial number range 0E141089-0E379999 Replaces Mercury 828303A1 and 855745A22