Sierra 18-99397 Trigger Assembly for Mercury/Mariner 6 Cylinder Outboard

The Sierra 18-99397 Trigger Assembly is a precision-engineered ignition component designed for Mercury and Mariner 6-cylinder 2-stroke outboard engines. This trigger assembly plays a critical role in the engine's ignition system by relaying crankshaft position data to ensure each spark plug fires at the exact right moment for optimal combustion and engine performance.

Key Features:

• Designed for 6-cylinder Mercury/Mariner 2-stroke outboard engines
• Constructed with marine-grade components for durability in harsh marine environments
• Features flame-proof, tin-coated, solvent-resistant lead wires for long-lasting reliability
• Engineered to meet or exceed OEM specifications
• Direct replacement for simplified installation with OEM-matching connectors
• Resists heat, vibration, and water intrusion

This trigger assembly is essential for maintaining proper spark timing, which directly affects throttle response, fuel efficiency, and overall engine performance. The precision construction ensures reliable ignition signals needed to optimize combustion in your Mercury or Mariner outboard motor.

Replaces Mercury Part Numbers: 96455A18, 96455T18, and CDI Electronics 134-6456-18

Note: This trigger is designed for 2-stroke engines and does not include direct injection models. Does not include linkage bushing or ball.