Sierra 18-5621 Mercury 30-60 HP 2/3 Cylinder Outboard Starter

The Sierra 18-5621 Outboard Starter is a premium, marine-grade replacement starter engineered for Mercury and Mariner 30 to 60 HP, 2-cylinder and 3-cylinder outboard engines. It is specifically designed to meet or exceed original equipment manufacturer (OEM) standards, ensuring dependable performance and reliable cranks in harsh marine environments.

Key Specifications & Marine Engineering

• Rotation Direction: Counter-clockwise (CCW).
• Gear Drive: 10-tooth count pinion.
• Corrosion Resistance: Features a robust, powder-coated housing to protect the unit against severe dampness, moisture, and saltwater exposure.
• Safety & Compliance: Fully engineered to satisfy SAE and ISO ignition protection regulations, UL standards, and mandatory European Community international safety parameters to prevent sparks near fuel systems.
• Rebuilt Integrity: Remanufactured models include 100% brand new critical internal components, including solenoids, drives, bushings, brushes, and springs, and are 100% load tested before shipping.

Direct Fitment & OEM Interchangeability

The Sierra 18-5621 acts as a direct, drop-in mechanical replacement for the following manufacturer part numbers:

• Mercury / Mariner: 50-822462, 50-822462T1, 50-893890T
• Arco: 5396
• Mallory: 9-15016

Verify Fitment Before Ordering

Outboard starter applications can vary by engine model, year, horsepower, cylinder configuration, mounting pattern, starter drive gear, tooth count, voltage, and rotation. Always compare the original starter and verify the correct OEM or Sierra replacement number for your specific Mercury outboard before ordering.

Shop the Sierra 18-5621 Mercury Outboard Starter at U.S. Boating & Marine Supplies for marine starters, Mercury replacement parts, and dependable outboard engine components.