Cylinder Head Gasket Set – Fits Johnson/Evinrude 18–35 HP 2-Stroke Outboards (Replaces 765012, 327674)
Cylinder Head Gasket Set – Fits Johnson/Evinrude 18–35 HP 2-Stroke Outboards (Replaces 765012, 327674) is backordered and will ship as soon as it is back in stock.
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Cylinder Head Gasket Set – Fits Johnson/Evinrude 18–35 HP 2-Stroke ...
Cylinder Head Gasket Set – Fits Johnson/Evinrude 18–35 HP 2-Stroke Outboards (Replaces 765012, 327674) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Cylinder Head Gasket Set is designed for compatible 2-cylinder Johnson and Evinrude 2-stroke outboard motors from 18 to 35 HP. The set provides replacement gaskets for servicing the cylinder head and water cover during engine maintenance or rebuilding.
It is listed as a replacement for Johnson/Evinrude OEM part numbers 765012, 324324, 327674, and 329419, and as an interchange for Sierra 18-3803, Sierra 18-3899, GLM 34570, and Mallory 9-63830. Confirm the exact model, year, engine configuration, and original part number before ordering.
- For compatible 2-cylinder, 2-stroke gasoline outboards.
- Designed for installation at the cylinder head and water-jacket cover.
- Includes head gaskets and water-cover gaskets for a complete gasket service.
Part Number Matrix
Use the following references to compare the listed OEM and aftermarket numbers with the part being replaced.
| Brand | Part Number | Notes |
|---|---|---|
| Johnson/Evinrude | 765012 | OEM gasket set reference |
| Johnson/Evinrude | 324324 | OEM head gasket reference |
| Johnson/Evinrude | 327674 | OEM water-cover gasket reference |
| Johnson/Evinrude | 329419 | OEM head gasket or supersession reference |
| Sierra | 18-3803 | Aftermarket gasket-set reference |
| Sierra | 18-3899 | Aftermarket water-cover gasket reference |
| GLM | 34570 | Aftermarket gasket-set reference |
| Mallory | 9-63830 | Aftermarket gasket-set reference |
Engine & Model Compatibility
Compatibility depends on the exact model and engine configuration. Verify the model designation, horsepower, year, and original gasket numbers against your engine before purchase.
This set is intended for listed 2-cylinder Johnson and Evinrude 2-stroke outboards in the 18–35 HP range. The year ranges below are provided as application guidance and do not replace confirmation against the engine model or service information.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson | Outboard | 18 | 2-Stroke | 1995–1998 | 765012, 324324 | Jet models |
| Johnson | Outboard | 20 | 2-Stroke | 1979–2003 | 765012, 324324 | 2-cylinder models |
| Johnson | Outboard | 25 | 2-Stroke | 1979–2003 | 765012, 324324 | 2-cylinder models |
| Johnson | 25C | 25 | 2-Stroke | 1997–2005 | 765012, 324324 | Commercial models |
| Johnson | Outboard | 28 | 2-Stroke | 1986–1996 | 765012, 324324 | 2-cylinder models |
| Johnson | Outboard | 30 | 2-Stroke | 1984–2003 | 765012, 324324 | 2-cylinder models |
| Johnson | Outboard | 35 | 2-Stroke | 1979–1988 | 765012, 324324 | 2-cylinder models |
| Evinrude | Outboard | 18 | 2-Stroke | 1995–1998 | 765012, 324324 | Jet models |
| Evinrude | Outboard | 20 | 2-Stroke | 1979–2001 | 765012, 324324 | 2-cylinder models |
| Evinrude | Outboard | 25 | 2-Stroke | 1979–2001 | 765012, 324324 | 2-cylinder models |
| Evinrude | 25C | 25 | 2-Stroke | 1997–2005 | 765012, 324324 | Commercial models |
| Evinrude | Outboard | 28 | 2-Stroke | 1986–1996 | 765012, 324324 | 2-cylinder models |
| Evinrude | Outboard | 30 | 2-Stroke | 1984–2001 | 765012, 324324 | 2-cylinder models |
| Evinrude | Outboard | 35 | 2-Stroke | 1979–1988 | 765012, 324324 | 2-cylinder models |
Technical Specs
- Product Type
- Cylinder Head Gasket Set
- Application
- Compatible 2-cylinder Johnson and Evinrude 2-stroke outboards
- Rated Horsepower Range
- 18–35 HP
- Fuel Type
- Gasoline
- Installation Areas
- Cylinder head and water-jacket cover
- Gasket Material
- Composite
What’s in the Box
- 2 x Head Gasket — replaces listed references 324324 and 329419
- 2 x Water Cover Gasket — replaces listed references 327674 and 33700
Installation Notes
- Ensure the engine is off, cool, and disconnected from its power source. Disconnect the fuel line.
- Remove the engine cowling and any components that obstruct access to the cylinder head and water cover.
- Remove the water cover and cylinder head, following the manufacturer's recommended torque sequence in reverse.
- Thoroughly clean the mating surfaces on the engine block, head, and cover. Remove all old gasket material and debris.
- Position the new gaskets on the clean mating surfaces and confirm that all bolt holes and passages are correctly aligned.
- Reinstall the cylinder head and water cover. Tighten the fasteners in the specified sequence and to the torque values provided in the applicable engine service manual.
- Reconnect all components, fuel lines, and electrical connections. Reinstall the cowling before testing the engine.
Troubleshooting & FAQ
How do I know if this gasket set fits my specific engine?
Verify the engine brand, model designation, horsepower, year, cylinder count, stroke, and original gasket part number. This set is intended for compatible 2-cylinder Johnson and Evinrude 2-stroke outboards from 18 to 35 HP. Cross-reference the original part number, such as 765012 or 324324, before ordering.
What are the signs of a failed head gasket?
Possible symptoms include overheating, loss of power or compression, water in the cylinders or on the spark plugs, milky-looking oil, or excessive white steam from the exhaust after the engine warms up. Diagnose the engine before replacing parts.
Does this set contain the gaskets listed for a 2-cylinder engine?
Yes. The package contents are listed as two head gaskets and two water-cover gaskets. Confirm that these quantities and gasket shapes match your specific engine before installation.
When should these gaskets be replaced?
Replace the gaskets whenever the cylinder head or water cover is removed for service, during an engine rebuild, or when testing confirms gasket failure. Gaskets are generally intended for single use and should not be reinstalled after removal.
Is this an OEM part or an aftermarket replacement?
This listing is for an aftermarket replacement set, not a Johnson or Evinrude OEM part. The listed OEM and aftermarket numbers are provided for cross-reference and fitment verification.
What are the shipping speed and cost?
Worldwide shipping is available. Typical transit is 5–15 days; standard shipping is free, and expedited options may be shown at checkout where available.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. Returns are accepted within the standard return window when the item is unused and in its original condition. Contact support with your order details for applicable instructions.
Safety & Important Info
- Verify the engine model, year, specifications, original part numbers, and gasket shape before purchase.
- This is an aftermarket replacement component and is not manufactured by Johnson or Evinrude.
- Always use the applicable engine service manual for torque specifications and tightening sequence.
- Professional installation is recommended when servicing the cylinder head or water jacket.
About Sea Sierra
- Pro-Grade Standards: We supply marine replacement parts selected for reliable service in real-world conditions.
- Fast Global Fulfillment: Free standard delivery is available to most regions, typically arriving in 5–15 days.
- Manufacturer-Direct Value: We offer competitively priced marine parts while maintaining attention to materials and quality control.
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