Sierra 18-99391 Timer Base for Johnson/Evinrude V6 Loop Charged Outboards

The Sierra 18-99391 Timer Base is a precision ignition component designed for Johnson and Evinrude V6 loop charged outboard engines. This critical engine management part controls ignition timing by working in conjunction with the power pack to deliver spark to the cylinders at the precise moment needed for optimal engine performance.

Application:

• 1988-2001 Johnson/Evinrude 185, 200, 225, and 250 HP models
• V6 loop charged engines with Quick Start and S.L.O.W. (Speed Limiting On Water) systems
• 3.0L V6 Sea Drive models from 1988-1990

Key Features:

• Premium quality construction for extended service life
• Meets or exceeds OEM manufacturer specifications
• Includes white glide ring and mounting hardware
• 4-pin Amphenol connector for power pack connection
• Professional-grade replacement for worn or faulty timer bases

OEM Replacement Numbers: Replaces Johnson/Evinrude part numbers 583533, 584586, 763775, and 778353. Also interchanges with CDI Electronics 133-3533.

This timer base is backed by Sierra's limited lifetime warranty and is engineered to restore reliable ignition performance on compatible Johnson and Evinrude outboard motors. Professional installation by a qualified marine technician is recommended for proper timing and optimal engine operation.