Sierra Ignition Coil 18-5111, Replaces 697-85570-11-00, for Yamaha 55 HP (1989-94) and 90 HP (1984-88) Outboards

The Sierra 18-5111 is a replacement ignition coil engineered to meet or exceed OE manufacturer specifications for quality and performance in Yamaha outboard ignition systems. It is built as a sealed unit using a high temperature dielectric epoxy that resists moisture intrusion and thermal breakdown, two of the most common causes of ignition coil failure in a marine engine bay. Sierra constructs the coil from high grade materials for extended service life under the vibration, heat, and moisture exposure typical of outboard operation.

This coil is a direct fit for Yamaha 55 HP (2 cylinder) outboards from 1989 to 1994 and Yamaha 90 HP outboards from 1984 to 1988, and it cross-references directly to OEM part number 697-85570-11-00. It uses a male connector for installation into the existing ignition harness. Boat owners and marine technicians use the 18-5111 to restore reliable spark and consistent engine starting when an original coil weakens, cracks, or fails a resistance test.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5111
• Product Type: Ignition Coil
• Weight: 0.7 pounds
• UPC: 747730043616
• Connector Gender: Male
• Installation Type: Coil pack
• Package Dimensions: 12.8 centimeters x 6.8 centimeters x 11.4 centimeters

Fitment

• Yamaha 55 HP (2 cylinder), 1989-94
• Yamaha 90 HP, 1984-88

Replaces (OEM)

• 697-85570-11-00

Frequently Asked Questions

What does the Sierra 18-5111 ignition coil fit? The Sierra 18-5111 fits Yamaha 55 HP (2 cylinder) outboards from 1989 to 1994 and Yamaha 90 HP outboards from 1984 to 1988.

Is the 18-5111 a direct replacement for OEM part 697-85570-11-00? Yes, the Sierra 18-5111 directly cross-references to and replaces Yamaha OEM ignition coil 697-85570-11-00.

How much does the 18-5111 ignition coil weigh? It weighs 0.7 pounds.

What connector type does this ignition coil use? The 18-5111 uses a male connector for installation into the ignition harness.

What is the UPC for the Sierra 18-5111? The UPC for the Sierra 18-5111 ignition coil is 747730043616.

Will this coil work on a Yamaha 90 HP from a different year range? The 18-5111 is confirmed for Yamaha 90 HP outboards from 1984 to 1988; fitment outside that range is not confirmed.

What material protects the 18-5111 from moisture and heat? A high temperature dielectric epoxy seals the coil to prevent moisture intrusion and thermal breakdown.

Is the Sierra 18-5111 an OEM part or aftermarket? The 18-5111 is a Sierra-brand aftermarket ignition coil engineered to meet or exceed OE manufacturer specifications.

What type of installation does the 18-5111 use? It is a coil pack style ignition coil designed for direct installation in place of the original unit.

What are the package dimensions of the 18-5111? The Sierra 18-5111 ships in packaging measuring 12.8 centimeters by 6.8 centimeters by 11.4 centimeters.

Does the 18-5111 fit a 2 cylinder Yamaha 55 HP engine? Yes, it is designed for the Yamaha 55 HP 2 cylinder outboard produced from 1989 to 1994.

How many coils are included with part number 18-5111? The 18-5111 is sold as a single ignition coil unit.