Sierra 18-99408 Ignition Trigger Assembly for Mercury Outboard 4-Cylinder

The Sierra 18-99408 is a high-quality ignition trigger assembly designed specifically for Mercury and Mariner outboard engines. This critical electrical ignition component sends precise timing signals to the power pack, ensuring reliable engine starting and smooth operation.

Key Features:

• Direct replacement for Mercury OEM part number 99021A6
• Designed for 4-cylinder Mercury outboard engines
• Compatible with 100HP, 115HP, and 125HP models
• Also fits 80 Jet models
• Precision-engineered for accurate ignition timing
• Durable construction for marine environment reliability

This trigger assembly is an essential component of the ignition system, working in conjunction with the stator and power pack to deliver optimal engine performance. Sierra Marine parts are manufactured to meet or exceed OEM specifications, providing reliable replacement parts at competitive prices.