ARCO IG028 Yamaha 40HP Outboard Ignition Pack

The ARCO IG028 ignition pack is intended for Yamaha 40HP two-cylinder outboards using the specified 6F5-series ignition module. The component provides the electronic ignition-control function for the compatible engine rather than acting as a simple ignition coil. Because ignition packs are application-specific, the original module number should be checked before the existing unit is removed. This is a replacement for the factory-style control arrangement and should be connected only to the matching harness.

Yamaha 6F5-85540-22-00, 6F5-85540-21-00, and 6F5-85540 are listed as OEM references. Mercury 11737M and 11737T are also included, along with Sierra 18-5136 and CDI Electronics 117-6522 and R6F5855402100. That cross-reference group helps confirm the correct module on engines that have already received aftermarket ignition service. Compare all connector positions and mounting details with the removed pack before installation.

Inspect the trigger wiring, grounds, ignition coils, and harness connectors while the module is being replaced. A corroded ground or damaged lead can cause an ignition-control fault that remains after a new pack is fitted. ARCO lists 12 months of materials-and-workmanship warranty coverage for leisure use and 90 days for commercial or racing applications. After installation, confirm reliable starting and consistent ignition through the normal speed range.

• Designed for the specified Yamaha two-cylinder ignition system
• Cross-references three Yamaha 6F5-series pack numbers
• Also cross-references Mercury, Sierra, and CDI Electronics modules
• Direct replacement for the factory-style ignition control

For other Yamaha ignition packs and marine engine-control replacements, Browse more Engine Controls & Ignition for related replacement and service components.