Base Gasket – Fits Suzuki DF40/DF50 4-Stroke Outboards (Replaces 51211-87J00)
Base Gasket – Fits Suzuki DF40/DF50 4-Stroke Outboards (Replaces 51211-87J00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Base Gasket – Fits Suzuki DF40/DF50 4-Stroke Outboards (Replaces 51...
Product Details
This aftermarket Base Gasket for Suzuki DF40/DF50 4-Stroke Outboards provides a reliable, precision-cut seal for the engine block. It is designed for a perfect fit on Suzuki DF40 and DF50 4-stroke models from 1999–2010, as well as their equivalent Johnson/Evinrude counterparts.
This part is a direct replacement and interchange for Suzuki OEM part numbers 51211-87J00 and 51211-87J00-000, and Johnson/Evinrude (BRP) part 5031523.
- Installs between the powerhead and engine holder assembly.
- Manufactured from high-quality, durable materials to meet or exceed OEM specifications.
- Ensures a leak-proof seal for oil and coolant passages.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Suzuki | 51211-87J00 |
| Suzuki | 51211-87J00-000 |
| Johnson/Evinrude (BRP) | 5031523 |
Engine & Model Compatibility
Confirm your engine model and year in the table below to ensure correct fitment.
Compatible with select Suzuki DF-series 4-stroke outboards.
Fits Johnson/Evinrude 4-stroke models that are rebadged Suzuki engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Suzuki | DF40 | 40 | 4-Stroke | 1999–2010 | 51211-87J00 | |
| Suzuki | DF50 | 50 | 4-Stroke | 1999–2010 | 51211-87J00 | |
| Suzuki | DF40TK5-TK10 | 40 | 4-Stroke | 2005–2010 | 51211-87J00 | |
| Suzuki | DF50TK5-TK10 | 50 | 4-Stroke | 2005–2010 | 51211-87J00 | |
| Johnson/Evinrude | DF40 | 40 | 4-Stroke | 1999–2010 | 5031523 | Rebadged Suzuki |
| Johnson/Evinrude | DF50 | 50 | 4-Stroke | 1999–2010 | 5031523 | Rebadged Suzuki |
Technical Specs
- Product Type
- Base / Engine Holder Gasket
- Installation Location
- Between powerhead and engine holder
- Material
- OEM-spec gasket material
- Product Dimensions
- 36.0 x 25.0 x 1.0
- Weight
- 0.2 lbs (0.09 kg)
What’s in the Box
- 1 x Base Gasket (Replaces 51211-87J00)
Installation Notes
- Ensure the engine is off, cool, and disconnected from the battery.
- Drain necessary fluids like oil or coolant to avoid spills during disassembly.
- Remove any components obstructing access to the powerhead and engine holder.
- Carefully unbolt and lift the powerhead from the engine holder.
- Remove the old gasket. Thoroughly clean both mating surfaces, removing all old gasket material and debris.
- Position the new gasket, making sure all bolt holes and fluid passages align correctly.
- Reinstall the powerhead, tightening bolts in the sequence and to the torque specified in your service manual.
- Reassemble all other components and refill engine fluids to the proper levels.
- Start the engine and carefully check for any signs of leaks around the new gasket.
Troubleshooting & FAQ
How do I know if my base gasket needs to be replaced?
Signs of a failing base gasket include external oil or coolant leaks at the seam between the powerhead and engine holder, unexplained engine overheating, or a noticeable loss of compression. A visual inspection might reveal cracking, brittleness, or corrosion on the exposed edges of the old gasket.
Do I need to use sealant with this gasket?
This gasket is designed to be installed dry. Applying additional sealants can interfere with its ability to create a proper seal and may not be recommended by the engine manufacturer. Always consult your engine’s official service manual for the most accurate procedure.
What happens if I use the wrong gasket or install it incorrectly?
Using an incorrect gasket can lead to serious engine damage. Improper fitment can block critical oil or water passages, leading to overheating or oil starvation. It can also cause persistent leaks that are difficult to fix without redoing the entire job.
Is this an OEM part or an aftermarket replacement?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
How fast is shipping and what does it cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty and return policy?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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