4243 400 1301 STIHL Ignition Module – Genuine OEM Ignition System Part4243 400 1301 STIHL Ignition Module Genuine OEM Ignition System Part The STIHL Ignition Module (4243 400 1301) is a genuine OEM electronic ignition component designed to deliver precise spark timing and reliable engine performance for select STIHL long reach hedge trimmers. This ignition module generates the high voltage spark required for combustion and ensures proper ignition timing under varying engine loads. Over time, ignition modules may fail