Sierra 18-99417 Timer Base Trigger Assembly for OMC Outboard Motors

The Sierra 18-99417 Timer Base Assembly is a precision-engineered replacement ignition component designed for OMC (Johnson/Evinrude) outboard motors. This critical component, also known as a trigger assembly, mounts beneath the flywheel and works in conjunction with the stator to generate accurate timing signals for the ignition system.

Key Features:

• Direct replacement for OEM OMC timer base assemblies
• Precision-manufactured to meet or exceed OEM specifications
• Essential for proper spark timing and engine performance
• Critical component for engines experiencing weak or no spark conditions
• Designed for reliable operation in harsh marine environments

The timer base contains trigger coils that send precise timing signals to the ignition system, ensuring proper spark delivery to each cylinder. A faulty timer base can result in weak spark, misfiring, hard starting, or complete loss of ignition. This Sierra replacement part restores proper ignition timing and reliable engine performance.