My Account
Shopping Cart

Sierra 18-6121Z Zinc Trim Tab Anode for Yamaha Counter Rotation Outboard Motors

Manufacturer

Sierra

<p>For nearly six decades, Sierra has established itself as one of the marine industry's most trusted names in aftermarket engine and drive parts. Founded as a specialized marine parts manufacturer, Sierra has grown into a comprehensive supplier of replacement components, instrumentation, and accessories for both recreational and commercial boating applications. Operating from their 300,000-square-foot distribution center in Litchfield, Illinois, Sierra serves boat owners and marine technicians worldwide with an extensive catalog of parts engineered specifically for the harsh saltwater environment.</p><h3>Marine Engine Excellence</h3><p>Sierra's reputation was built on delivering precision-engineered internal engine components and drive system parts that meet or exceed OEM specifications. Their <a href="/7570-sierra-engine-gasket-set-5404">engine gasket sets</a> provide critical sealing solutions for inboard and outboard motors, while their <a href="/7570-sierra-engine-complete-assembly-15341">engine complete assemblies</a> offer comprehensive replacement options for major overhauls. Each component undergoes rigorous testing to ensure reliability in demanding marine conditions, from corrosion resistance to temperature cycling performance.</p><h3>Instrumentation and Monitoring Systems</h3><p>Accurate instrumentation is essential for boat operators to monitor engine health and prevent costly breakdowns on the water. Sierra's comprehensive line of <a href="/7570-sierra-gauges-200483">gauges</a> includes everything from fuel pressure and temperature indicators to voltmeters and trim gauges, all designed with marine-grade materials that withstand vibration, moisture, and UV exposure. Their <a href="/7570-sierra-tachometer-gauge-1488">tachometer gauges</a> deliver precise RPM readings critical for optimizing engine performance and fuel efficiency. Supporting these instruments, Sierra's <a href="/7570-sierra-gauge-resistor-47908">gauge resistors</a> ensure proper signal conditioning and accurate readings across various sensor types and engine configurations.</p><h3>Expanded Product Portfolio</h3><p>In 2022, Sierra significantly broadened its scope beyond traditional marine engine parts to encompass a wider range of boating accessories and even outdoor power equipment components. This strategic expansion brought established marine brands like Shields and Moeller under the Sierra umbrella, creating a one-stop resource for marine maintenance and replacement parts. The company now offers fuel systems, electrical components, battery charging solutions, and NMEA electronics alongside their traditional engine parts lineup.</p><h3>Quality Backed by Industry-Leading Warranties</h3><p>What sets Sierra apart in the crowded aftermarket marine parts market is their commitment to standing behind every component they manufacture. Their warranty coverage extends beyond simple part replacement—it includes shop labor, haul-out fees, towing charges, and related incidental costs should a warrantied part fail. This comprehensive protection reflects the company's confidence in their manufacturing processes and quality control standards. For boat owners facing repairs far from shore or mechanics working on customer vessels, this peace of mind is invaluable. Whether you're maintaining an outboard motor, rebuilding an inboard engine, or upgrading your boat's instrumentation, Sierra's decades of marine industry experience and commitment to quality make them a reliable choice for keeping your vessel running at peak performance.</p>

Part Number

18-6121Z
07/12/2036 10:20 PM
Sale Price

$34.94

4 left at this price

delivery box

Usually delivered within 2 days

Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-6121Z is a zinc trim tab anode engineered as a direct replacement for Yamaha counter rotation outboard motors. This sacrificial anode mounts on the trim tab of compatible Yamaha outboards and serves a dual purpose: providing critical galvanic corrosion protection to the lower unit and helping to adjust the running attitude of the boat by altering the trim tab angle.

Made from high-purity zinc alloy, this anode is designed to sacrificially corrode in place of the engine's metal components, absorbing electrochemical corrosion caused by exposure to saltwater and brackish water environments. Regular replacement of this anode is one of the most cost-effective ways to extend the service life of your outboard's lower unit.

Key Features:

  • Zinc alloy construction for optimal galvanic protection in saltwater and brackish environments
  • Direct OEM replacement — replaces Yamaha part numbers 6K1-45371-01-00 and 6K1-45371-02-00
  • Specifically designed for Yamaha counter rotation (L-series) outboard motors
  • Includes mounting bolt
  • Meets or exceeds original equipment specifications

Cross-Reference Part Numbers: Yamaha 6K1-45371-01-00, Yamaha 6K1-45371-02-00, GLM 12843, Tecnoseal 01134, CMP CM6K14537102Z

Sierra marine parts are built to meet or exceed OEM specifications and are backed by Sierra's manufacturer warranty, making this a trusted choice for boat owners, marine technicians, and service shops.

Great easy fast I love how easy it was to pay my bill using paypal!

great prices

Quick n easy

very satyisfied

Ok so far

quick and easy

quick and easy

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy