Sierra Ignition Pack 18-99241 for Yamaha 3-Cylinder Outboard Engines

The Sierra 18-99241 is an ignition pack built for Yamaha outboard engines with a 3-cylinder configuration. The ignition pack (also called a CDI module or power pack) is the electronic control unit that manages spark timing and delivers the high-voltage pulse to the ignition coils, which in turn fire the spark plugs in the correct sequence. On a 3-cylinder outboard, a failing or worn ignition pack commonly shows up as hard starting, a rough or uneven idle, misfiring under load, reduced top-end power, or a complete no-spark condition on one or more cylinders. Replacing a weak or failed unit with the 18-99241 restores consistent spark delivery and helps the engine return to normal starting and running performance.

This ignition pack is sold as a direct-fit replacement unit for the applicable Yamaha 3-cylinder outboard ignition system, allowing installation in place of the original factory component using the engine's existing wiring harness connections.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99241
• Engine Application: Yamaha Outboard
• Cylinder Count: 3 Cylinder
• Weight: 1.2 pounds
• UPC: 808282394073

Frequently Asked Questions

What engine does the Sierra 18-99241 ignition pack fit? The Sierra 18-99241 is built for Yamaha outboard engines with a 3-cylinder configuration.

What does an ignition pack do on a 3-cylinder outboard? It is the electronic control module that times and delivers the high-voltage pulse to the ignition coils so each cylinder fires in the correct sequence; the 18-99241 performs this function on applicable Yamaha 3-cylinder outboards.

How much does the 18-99241 ignition pack weigh? The Sierra 18-99241 weighs 1.2 pounds.

What are the symptoms of a failing ignition pack? Hard starting, a rough or uneven idle, misfiring under load, lost power at higher RPM, or no spark on one or more cylinders are common signs pointing to a failing ignition pack like the 18-99241.

Is the 18-99241 a direct replacement for the factory Yamaha ignition pack? Yes, the Sierra 18-99241 is designed to install using the existing engine wiring harness connections on the applicable Yamaha 3-cylinder outboard ignition system.

Does the 18-99241 come with mounting hardware or wiring? The 18-99241 is supplied as the ignition pack unit itself; it connects to the outboard's existing wiring harness during installation.

Can this ignition pack be used on a 2-cylinder or 4-cylinder Yamaha outboard? No, the Sierra 18-99241 is specifically configured for 3-cylinder Yamaha outboard engines and is not intended for engines with a different cylinder count.

What is the UPC for the Sierra 18-99241 ignition pack? The UPC for the Sierra 18-99241 Yamaha ignition pack is 808282394073.

Is the Sierra 18-99241 a new or remanufactured part? The 18-99241 is sold as a new ignition pack unit for Yamaha 3-cylinder outboard engines.

Why would a boat with a bad ignition pack still crank but not start? If the starter motor turns the engine over but no spark reaches the cylinders, the ignition pack is a likely cause; the 18-99241 restores that spark delivery on applicable Yamaha 3-cylinder outboards.