663-43118-01 Transom Clamp Assembly for Yamaha E40G | JLM Marine

Transom Clamp Assembly – Fits Yamaha E40G 40-55HP Outboard Engines

This transom clamp assembly is designed for Yamaha outboard engines, specifically the E40G series in the 40-55HP range. It provides secure mounting and proper clamping force to safely attach your outboard motor to the boat transom. Manufactured to OEM specifications, this aftermarket replacement ensures reliable performance and durability.

This assembly directly replaces Yamaha OEM part number 663-43118-01 and supersedes 6F5-43116-00, providing a cost-effective alternative to factory parts while maintaining quality standards.

• Complete assembly includes handle, pad, screw, pin, and bolt for easy installation
• Engineered for precise fit on Yamaha 40-55HP outboard models
• Brand new aftermarket replacement part built to OEM specifications

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 Yamaha owners, here's a guide to help you identify your engine's serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

This complete transom clamp assembly includes the following components:

• 6F5-43114 Pad × 1
• 6F5-43116 Screw, Transom Clamp × 1
• 663-43118-00 Handle, Transom Clamp × 1
• 90243-04007 Pin × 1
• 90109-06M12 Bolt × 1

Note: All necessary hardware is included for complete installation.

Installation Guide

1. Ensure the outboard motor is securely supported and the engine is off before beginning installation.
2. Remove the old transom clamp assembly by loosening the transom clamp screw and withdrawing the pin and bolt.
3. Clean the transom clamp mounting area on the motor bracket, removing any debris, corrosion, or old lubricant.
4. Position the new 6F5-43114 pad in the designated location on the clamp bracket.
5. Insert the 90243-04007 pin through the handle and bracket assembly, ensuring proper alignment.
6. Install the 663-43118-00 handle onto the clamp mechanism, verifying it moves freely.
7. Thread the 6F5-43116 transom clamp screw into the clamp bracket until it seats properly.
8. Insert the 90109-06M12 bolt through the mounting hole and tighten to manufacturer specifications.
9. Apply marine-grade grease to all moving parts and threads to prevent corrosion and ensure smooth operation.
10. Test the clamp handle operation by opening and closing it several times to verify proper function.
11. Mount the outboard motor to the boat transom and secure it by tightening the clamp screw firmly.
12. Perform a final inspection to ensure all components are properly seated and the motor is securely attached before operating.

Troubleshooting & FAQ

Q: How do I confirm this transom clamp assembly fits my Yamaha outboard?
A: Check your engine model and horsepower against the compatibility table above. The primary application is for Yamaha E40G 40-55HP models, but it also fits various 2-30HP 2-stroke and 2-25HP 4-stroke engines. Verify your original part number (663-43118-01 or 6F5-43116-00) to ensure proper fitment.

Q: What are the signs that my transom clamp needs replacement?
A: Common indicators include difficulty tightening or loosening the clamp screw, visible cracks or corrosion on the handle or bracket, excessive play or wobble in the motor mounting, or stripped threads on the clamp screw. If the clamp cannot securely hold the outboard to the transom, immediate replacement is necessary for safety.

Q: Can I use this assembly on both 2-stroke and 4-stroke Yamaha engines?
A: Yes, this transom clamp assembly is compatible with both 2-stroke and 4-stroke Yamaha outboards within the specified horsepower ranges. Refer to the compatibility table to verify your specific engine model and stroke type.

Q: How often should I inspect or replace the transom clamp assembly?
A: Inspect the transom clamp assembly at the beginning of each boating season and after any hard grounding or impact. Replace immediately if you notice cracks, excessive wear, or functional issues. In saltwater environments, apply marine grease regularly and inspect more frequently due to increased corrosion risk.

Q: What's the difference between OEM and aftermarket transom clamp assemblies?
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.