Gasket, Carburetor to Airbox – Fits Johnson/Evinrude 3-Cylinder Engines (Replaces 333008, 321793)
Gasket, Carburetor to Airbox – Fits Johnson/Evinrude 3-Cylinder Engines (Replaces 333008, 321793) 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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Gasket, Carburetor to Airbox – Fits Johnson/Evinrude 3-Cylinder Eng...
Product Details
This is a direct replacement Gasket, Carburetor to Airbox – Fits Johnson/Evinrude 3-Cylinder Engines, designed to create a secure seal between the carburetor and the airbox. It is engineered for a precise fit on various Johnson/Evinrude 3-cylinder outboard motors, including popular 50 HP to 75 HP models.
This part provides a reliable, direct interchange for Johnson/Evinrude part numbers 333008 and 321793, as well as Sierra 18-0975, GLM 34420, Pro Marine 772, Mallory 9-60419, and RAREELECTRICAL 321.
- Ensures a direct-fit replacement for a proper seal.
- Prevents air leaks between the carburetor and airbox assembly.
- Includes all items pictured for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 333008 |
| Johnson/Evinrude | 321793 |
| Sierra | 18-0975 |
| GLM | 34420 |
| Pro Marine | 772 |
| Mallory | 9-60419 |
| RAREELECTRICAL | 321 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is designed specifically for Johnson and Evinrude 3-cylinder outboard engines. Please verify compatibility with your model and horsepower rating.
| Brand | Model | Rated HP | OEM Part No. |
|---|---|---|---|
| Johnson/Evinrude | 3-cylinder models | 50-70 HP | 333008, 321793 |
Technical Specs
- Product Type
- Carburetor to Airbox Gasket
- Installation
- Direct fitment between carburetor and airbox
- Product Dimensions
- 29.0" L x 7.5" W x 0.5" H
What’s in the Box
- 1 x Gasket, Carburetor to Airbox (333008/321793)
Installation Notes
- Disconnect the battery and follow all safety precautions before beginning work.
- Remove the engine cowling and carefully detach the airbox (air silencer) cover and assembly from the carburetors.
- Remove the old, worn gasket. Be careful not to let any debris fall into the carburetor throats.
- Thoroughly clean both mating surfaces on the carburetor face and the airbox. Ensure they are free of old gasket material, oil, and grime.
- Align the new gasket onto the carburetors, ensuring all bolt holes and openings match perfectly.
- Reinstall the airbox assembly, ensuring it sits flush against the new gasket.
- Tighten the mounting bolts evenly and to the manufacturer's specified torque to prevent air leaks. Do not overtighten.
- Reconnect the battery, start the engine, and check for any signs of air leaks (e.g., unusual whistling sounds or rough idling).
Troubleshooting & FAQ
How do I confirm this gasket fits my engine?
The best method is to match your original part number to one of the cross-reference numbers listed in our Part Number Matrix. Also, check your engine model and HP against the compatibility table. If you are unsure, please compare our product images to your original part before purchasing.
What are the signs of a failing carburetor-to-airbox gasket?
Symptoms of a bad gasket include a high or unsteady idle, a whistling sound from the engine, difficulty starting, or a lean running condition. A visual inspection may also reveal cracks or deterioration of the old gasket material.
What is the purpose of this gasket?
This gasket creates an airtight seal between the carburetors and the airbox (or air silencer). This ensures that the engine only draws air through the filtered intake, preventing unfiltered air from leaning out the fuel mixture and causing performance issues.
Is this gasket reusable?
No, this gasket is designed for one-time use. Once it has been compressed, it will not provide a reliable seal if removed and reinstalled. Always use a new gasket when servicing the airbox or carburetors.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, where it is batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. Please 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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