Sierra 18-5879 Outboard Solenoid, Replaces Yamaha 688-81950-10-00, Fits 40-90 HP 2-Stroke Engines

The Sierra 18-5879 is a starter solenoid built for Yamaha 2-stroke outboard engines from 40 hp through 90 hp. As the switching component between the ignition circuit and the starter motor, the solenoid carries the high-current load needed to engage the starter, and a worn or corroded unit is a common cause of a no-crank condition on these outboards. The 18-5879 is built with 100% copper windings for maximum magnetic pull strength, along with solid copper terminals that reduce voltage drop at the connection points for a stronger, more consistent start signal. A copper contact disc is used inside the unit for longer service life under repeated cranking cycles, and the brackets and canister are plated to resist corrosion, which matters on an outboard that is regularly exposed to salt water and engine-bay moisture. It is built to meet or exceed OEM specifications and is designed as a direct, OEM-interchangeable replacement, so no modification is required for installation. The solenoid uses a transom mount configuration and is rated for use with 2-stroke gasoline engines. Because outboard solenoids are engine- and model-specific, confirm your engine's horsepower and model year against the fitment list below before ordering to make sure the 18-5879 is the correct part for your Yamaha outboard.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5879
• Product Type: Solenoid
• Engine Type: 2-Stroke
• Recommended Use: For Salt Water
• Mounting Type: Transom Mount
• Maximum Horsepower: 90 Horsepower
• Weight: 0.8 pounds
• Item Dimensions: 6.81 inches D x 6.57 inches W x 6.81 inches H
• Item Package Dimensions: 4.9 centimeters L x 16.7 centimeters W x 17.3 centimeters H
• UPC: 808282292560
• Country of Origin: Taiwan, Province of China
• OEM Cross-Reference: 688-81950-10-00, 688-81941-00-00

Fitment

• Yamaha 2-Stroke 40 hp (1984-88)
• Yamaha 2-Stroke 50 hp (1984-88)
• Yamaha 2-Stroke 60 hp (2001-06)
• Yamaha 2-Stroke 70 hp (1991-Current)
• Yamaha 2-Stroke 90 hp (1984-91)

Replaces (OEM)

• 688-81950-10-00
• 688-81941-00-00

Frequently Asked Questions

What does the Sierra 18-5879 solenoid replace? The 18-5879 replaces Yamaha OEM solenoids 688-81950-10-00 and 688-81941-00-00, so either original part number can be cross-referenced to this Sierra solenoid.

Which Yamaha outboards is the 18-5879 solenoid designed for? It is designed for Yamaha 2-stroke outboards including 40 hp (1984-88), 50 hp (1984-88), 60 hp (2001-06), 70 hp (1991-Current), and 90 hp (1984-91).

Is the 18-5879 an OEM or aftermarket solenoid? It is an aftermarket Sierra solenoid built to meet or exceed OEM specifications and is 100% OEM interchangeable, so no modifications are needed to install it in place of the original Yamaha unit.

What is the 18-5879 solenoid made of? Sierra's 18-5879 solenoid uses 100% copper windings for maximum magnetic pull, solid copper terminals, a copper contact disc, and plated brackets and canister to resist corrosion.

How much does the 18-5879 solenoid weigh? The Sierra 18-5879 solenoid weighs 0.8 pounds, with item dimensions of 6.81 inches D x 6.57 inches W x 6.81 inches H.

Can the 18-5879 solenoid be used in saltwater? Yes, the 18-5879 is recommended for salt water use, and its plated brackets and canister are designed to resist the corrosion that comes with that environment.

How does the 18-5879 solenoid mount on the outboard? It uses a transom mount configuration, matching the mounting style of the Yamaha units it replaces.

Will the 18-5879 solenoid fit a 2003 Yamaha 60 hp outboard? Yes, the 18-5879 covers Yamaha 2-stroke 60 hp outboards from the 2001-06 range, which includes a 2003 model.

What horsepower range does the 18-5879 solenoid cover? The 18-5879 is rated up to 90 horsepower and covers Yamaha 2-stroke engines from 40 hp through 90 hp as listed in its fitment range.

Does the 18-5879 use the same terminals as the original Yamaha solenoid? It uses solid copper terminals designed to reduce voltage drop, matching the electrical performance needed for a direct OEM-interchangeable fit on the covered Yamaha 2-stroke outboards.