325974 303879 Upper Motor Mount for Johnson Evinrude OMC | JLM Marine

Upper Motor Mount for Johnson Evinrude OMC Outboards – 20 25 30 35 HP

This premium aftermarket upper motor mount is engineered to fit Johnson Evinrude OMC outboard engines ranging from 18 to 35 HP. Designed to absorb vibration and securely support your motor, this rubber mount ensures smooth operation and extended engine life across multiple model years from the 1970s through the 1990s.

This part directly replaces OEM part numbers 325974, 303879, and 778211, providing a reliable solution for restoring proper motor mounting and reducing wear on your outboard components.

• Durable rubber construction designed to withstand marine environments
• Direct replacement for multiple OEM part numbers
• Essential component for vibration dampening and motor stability

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Johnson/Evinrude owners, here's a guide to help you identify your engine's serial/model: Johnson/Evinrude Serial Number Guide.

Technical Specifications

Package Contents

Your order includes:

• 1 × Rubber Upper Motor Mount (OEM 325974)

Installation Guide

1. Disconnect the battery and ensure the engine is off and cool before beginning work.
2. Support the engine using an appropriate hoist or lifting device to relieve tension on the motor mounts.
3. Locate the upper motor mount on your Johnson Evinrude outboard; it is typically positioned between the motor and the mounting bracket.
4. Remove the fasteners (bolts or nuts) securing the old upper motor mount. Keep hardware if reusable.
5. Carefully extract the worn or damaged rubber mount from its position.
6. Inspect the mounting surfaces for corrosion, damage, or debris and clean as necessary.
7. Position the new upper motor mount in the same orientation as the original.
8. Insert and hand-tighten the mounting fasteners to hold the mount in place.
9. Torque the fasteners to the manufacturer's specifications using a calibrated torque wrench.
10. Gently lower the engine back into position and remove the lifting device.
11. Reconnect the battery and start the engine to check for proper alignment and vibration reduction.
12. Inspect all connections after the first few hours of operation to ensure everything remains secure.

Troubleshooting & FAQ

Q: How do I confirm this upper motor mount fits my engine?
A: Cross-reference your engine's HP and model year with the compatibility table above. Additionally, verify that your original mount matches OEM part numbers 325974, 303879, or 778211.

Q: What are the signs that my motor mount needs replacement?
A: Common symptoms include excessive engine vibration, unusual noise during operation, visible cracks or deterioration in the rubber, and misalignment of the motor on the transom.

Q: How often should I replace my motor mounts?
A: Motor mounts should be inspected annually and typically replaced every 3–5 years depending on usage and environmental conditions. Replace immediately if cracking, hardening, or separation of the rubber is observed.

Q: Can I install this mount myself or do I need a professional?
A: If you have basic mechanical skills and the proper tools (including a hoist to support the engine), you can install this mount yourself. However, professional installation is recommended to ensure correct alignment and torque specifications.

Q: Is this an OEM part or aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.