Sierra 18-5128 Ignition Coil, Replaces Yamaha 6R3-85570-01-00, for 115/130/150HP Outboards

The Sierra 18-5128 is an ignition coil built as a replacement for Yamaha outboard engines. The ignition coil is the component that steps up battery voltage into the high-voltage pulse needed at the spark plug, and a weak or failed coil is a common cause of hard starting, misfires, or a no-spark condition. This coil is designed as a direct fit for Yamaha 115HP, 130HP, and 150HP outboards (1994-04), 175HP (1994-95, 1997-98, 2000), 200HP (1994-98), 225HP (1997), B115HP (1998-99), and C115HP (1997-98) models, including late model V4 and V6 powerheads. It carries a female connector for a secure, correct-fit electrical connection and uses a screw-in or bolt-on mounting style for straightforward installation in place of the original unit. The coil directly replaces Yamaha OEM part number 6R3-85570-01-00, so it installs using the factory mounting points and wiring without modification. Each unit ships as a single ignition coil ready to install on the applicable Yamaha outboard powerhead. Whether you are restoring ignition performance on an aging outboard or proactively replacing a coil that is showing signs of wear, the Sierra 18-5128 is sized and configured to match the original Yamaha component it replaces.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5128
• Product Name: Ignition Coil
• Category: Yamaha Outboard Ignition Coils
• UPC: 808282181291
• Weight: 0.2 pounds
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Connector Gender: Female
• Installation Type: Screw-In or Bolt-On
• Unit Count: 1
• OEM Cross-Reference: Yamaha 6R3-85570-01-00

Fitment

• Yamaha outboard 115HP, 130HP, 150HP (1994-04)
• Yamaha outboard 175HP (1994-95, 1997-98, 2000)
• Yamaha outboard 200HP (1994-98)
• Yamaha outboard 225HP (1997)
• Yamaha outboard B115HP (1998-99)
• Yamaha outboard C115HP (1997-98)
• Late model Yamaha V4 & V6 outboard powerheads

Replaces (OEM)

• Yamaha 6R3-85570-01-00

Frequently Asked Questions

What does the Sierra 18-5128 ignition coil replace? The Sierra 18-5128 is a direct replacement for Yamaha OEM ignition coil part number 6R3-85570-01-00, so it installs in place of the original coil without modification.

Which Yamaha outboard models fit the 18-5128 ignition coil? This coil fits Yamaha outboard 115HP, 130HP, and 150HP models (1994-04), 175HP (1994-95, 1997-98, 2000), 200HP (1994-98), 225HP (1997), B115HP (1998-99), and C115HP (1997-98), including late model V4 and V6 powerheads.

How much does the Sierra 18-5128 weigh? The Sierra 18-5128 ignition coil weighs 0.2 pounds.

What are the dimensions of the 18-5128 ignition coil? The Sierra 18-5128 measures 0.39 x 0.39 x 0.39 inches.

Is the Sierra 18-5128 a genuine Yamaha part or aftermarket? The 18-5128 is a Sierra-branded aftermarket ignition coil manufactured as a direct replacement for Yamaha OEM part 6R3-85570-01-00, not an original Yamaha-branded component.

What type of electrical connector does this ignition coil use? The Sierra 18-5128 uses a female connector, matching the factory Yamaha wiring harness for a secure fit.

How is the Sierra 18-5128 ignition coil installed? It uses a screw-in or bolt-on installation type, mounting at the same factory points as the original Yamaha 6R3-85570-01-00 coil it replaces.

How many ignition coils come in one Sierra 18-5128 package? Each package contains one Sierra 18-5128 ignition coil, sold individually.

Will the 18-5128 fit a Yamaha B115HP or C115HP outboard? Yes, the Sierra 18-5128 is listed as fitting the Yamaha B115HP (1998-99) and C115HP (1997-98) outboard models.

What symptoms indicate the ignition coil needs to be replaced? A failing ignition coil like the one the Sierra 18-5128 replaces typically causes hard starting, engine misfires, or a no-spark condition on the affected cylinder.

Does the Sierra 18-5128 work on V4 and V6 Yamaha powerheads? Yes, the catalog lists this coil as fitting late model Yamaha V4 and V6 outboard powerheads in addition to the specific horsepower ratings noted.

What is the UPC for the Sierra 18-5128 ignition coil? The Sierra 18-5128 ignition coil has UPC 808282181291.