Reed Gasket – Fits Mercury/Mariner 200-225-250 DFI 3.0L V6 (Replaces 27-850283)

$21.99 $35.00

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Reed Gasket – Fits Mercury/Mariner 200-225-250 DFI 3.0L V6 (Replaces 27-850283) is backordered and will ship as soon as it is back in stock.

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Product Details

This aftermarket Reed Gasket is a direct replacement for Mercury and Mariner 200, 225, and 250 horsepower 3.0L V6 DFI and Optimax outboard engines manufactured between 2000 and 2018. It is engineered to meet or exceed OEM specifications for a reliable seal and optimal engine performance.

It serves as a direct interchange for Mercury part numbers 27-850283, 27-804680, 27-841220, and 850283.

Designed for direct replacement installation.
Compatible with DFI, EFI, and Optimax gasoline engines.
Ensures a proper seal for the reed block assembly.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number	Notes
Mercury	27-850283	Current Part Number
Mercury	27-804680	Superseded by 27-850283
Mercury	27-841220	Superseded by 27-850283
Mercury	850283	Superseded by 27-850283

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This gasket fits a wide range of Mercury and Mariner 3.0L and 3.2L V6 DFI, Optimax, and Pro XS outboard engines. Note the specific year ranges for each model.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercury	200 DFI	200	2-Stroke	2000–2018	27-850283	3.0L V6
Mercury	225 DFI	225	2-Stroke	2000–2018	27-850283	3.0L V6
Mercury	250 DFI	250	2-Stroke	2002–2008	27-850283	3.0L V6
Mercury	200 Optimax	200	2-Stroke	2000–2018	27-850283	3.0L V6
Mercury	225 Optimax	225	2-Stroke	2000–2018	27-850283	3.0L V6
Mercury	250 Optimax	250	2-Stroke	2008–2014	27-850283	3.0L V6
Mercury	200 Pro XS	200	2-Stroke	2008–2018	27-850283	3.0L V6
Mercury	225 Pro XS	225	2-Stroke	2005–2018	27-850283	3.0L V6
Mercury	300 XS	300	2-Stroke	2006–2017	27-850283	3.2L V6

Technical Specs

Product Type: Reed Gasket
Installation: Direct replacement
Fuel Type: Gasoline (DFI/EFI/Optimax engines)
Dimensions: 24.0 in. x 10.25 in. x 0.13 in.
Other Technical Attributes: Designed for Mercury/Mariner 3.0L V6 DFI engines

What’s in the Box

1 x Reed Gasket (Replaces 27-850283)

Installation Notes

Disconnect the battery and allow the engine to cool completely.
Carefully follow the manufacturer's service manual to remove the intake manifold or reed block assembly.
Remove the old gasket and thoroughly clean both mating surfaces, ensuring they are free of any old sealant or debris.
Position the new gasket correctly onto the reed block.
Reinstall the assembly, tightening all bolts to the manufacturer's specified torque sequence and values.
Reconnect the battery and start the engine, carefully checking for any air or fuel leaks around the installation area.

Troubleshooting & FAQ

How do I know if this reed gasket is failing?

Common signs of a faulty reed gasket include poor or rough idling, difficulty starting the engine, reduced overall power, engine backfiring, or an audible hissing sound coming from the intake area. A visual inspection may also reveal cracks, brittleness, or damage to the old gasket.

Is this gasket compatible with both DFI and Optimax engines?

Yes, this gasket is designed for Mercury/Mariner 3.0L and 3.2L V6 engines, which includes DFI, Optimax, and Pro XS models within the specified year ranges. Always verify your specific model and year in the compatibility chart before ordering.

Should I use a sealant with this gasket?

This gasket is typically designed to be installed dry. However, it is crucial to consult your engine’s official service manual for specific instructions regarding the use of sealants for your particular model.

Why does the compatibility table list both 3.0L and 3.2L engines?

While most compatible models are 3.0L, the high-performance Mercury 300 XS is a 3.2L engine that uses the same reed gasket (OEM Part No. 27-850283). Our data confirms this cross-compatibility is correct.

OEM vs. Aftermarket?

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.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

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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