Sierra 18-2125
Shipping (3PM)
Within 30 days
Sierra 18-2125 Product Description
Keep your outboard running smoothly on the water with the Sierra 18-2125 yoke assembly, a durable aftermarket solution designed as a direct replacement for Mercury's 55-3800 part. This essential component plays a critical role in linking the drive system, ensuring precise power transmission and responsive handling during every excursion. Boat owners trust Sierra parts for their rugged construction that battles harsh marine conditions—from saltwater spray to constant vibration—without compromising performance.
Key Features and Performance Advantages
- Superior Material Build: Crafted from corrosion-resistant alloys, it stands up to freshwater and saltwater environments, extending the life of your propulsion system.
- Exact OEM Fitment: Engineered to mirror original specifications, installing this yoke assembly means minimal downtime and no modifications needed for most Mercury-compatible setups.
- Enhanced Durability: Reinforced design handles high-torque stresses, reducing wear on connected gears and shafts for fewer breakdowns mid-adventure.
- Smooth Operation: Precision machining minimizes play and backlash, delivering crisp shifts and reliable throttle response that keeps you in control.
Unlike basic replacements, the Sierra 18-2125 prioritizes longevity with tighter tolerances and better heat dissipation, making it a smart upgrade for avid anglers, weekend cruisers, and commercial operators alike.
Perfect Fit for Popular Models
This yoke assembly slots seamlessly into a range of Mercury and Mariner outboards, particularly those requiring the 55-3800 equivalent. It's a go-to for mechanics servicing compact to mid-range engines where reliable yoke performance is non-negotiable. Always cross-check your engine's serial number against Sierra's compatibility charts for the best match.
Pro Installation Tips
- Drain fluids and secure the engine in a stable position before disassembly.
- Inspect surrounding splines and seals for wear—replace as needed to avoid future issues.
- Torque to manufacturer specs using marine-grade lubricant on splines for effortless alignment.
- Test in neutral and under load post-install to confirm smooth engagement.
With basic tools, most DIYers complete the swap in under an hour, saving time and hassle compared to sourcing OEM pieces.
Frequently Asked Questions
What does the Sierra 18-2125 yoke assembly replace?
It directly replaces Mercury part number 55-3800, serving as a high-quality aftermarket yoke for compatible outboard drive systems.
Is the Sierra 18-2125 suitable for saltwater use?
Yes, its corrosion-resistant materials make it ideal for both freshwater and saltwater environments, outperforming standard parts in harsh conditions.
Does this yoke assembly fit all Mercury outboards?
It's designed for specific Mercury and Mariner models matching the 55-3800 spec—verify compatibility with your engine's serial number for a perfect fit.
How do I know if my yoke needs replacing?
Look for symptoms like shift hesitation, excessive play in the driveshaft, or metal shavings in the gear oil, which indicate wear.
Can I install the Sierra 18-2125 myself?
Absolutely, with standard tools and following torque specs, it's a straightforward DIY job that takes about an hour for experienced users.
What makes Sierra yoke assemblies better than generics?
Sierra uses precision engineering and premium alloys for tighter tolerances, longer life, and OEM-level performance at a fraction of the cost.
Save $13 when you buy the Sierra 18-2125 for only $87 from NVN Marine! Same day shipping before 3pm.
Sierra 18-2125 Technical Specifications
| Type: | |
|---|---|
| Vendor: |
Sierra Engine Parts |
| Weight: |
2.2 lb |
Sierra 18-2125 User Reviews
Sierra 18-2125 Shipping & Return
| Shipping Weight: |
2.2 lb |
|---|---|
| Box Sizes: |
3.00 (h) x 4.00 (w) x 7.00 (l) |
| Cubic Feet: |
84.0 |
| Returnable: |
Yes |
For detailed shipping policy please check our Shipping Policy and you can find our Return and Refund Policy here.