Transom Clamp Assembly – Fits Yamaha 40HP 48HP 55HP 60HP (Replaces 663-43118-01, 6F5-43116-00)

Product Details

This Transom Clamp Assembly is designed to fit Yamaha outboard motors rated 40HP, 48HP, 55HP, and 60HP 2-stroke engines. It provides secure mounting and engine retention to the boat transom, ensuring stable operation under marine conditions.

This assembly directly replaces OEM part numbers 663-43118-01 and 6F5-43116-00, offering reliable interchange compatibility.

• Complete assembly includes handle, screw, pad, pin, and bolt
• Suitable for both freshwater and saltwater environments
• Bolt-on installation to transom bracket

Part Number Matrix

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

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Technical Specs

Product Type

Transom Clamp Assembly

Application

Outboard motor transom mounting

Condition

Brand new aftermarket

Material

Marine-grade metal and composite

Components Included

Handle, screw, pad, pin, bolt

What's in the Box

• 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

Installation Notes

1. Disconnect battery and remove engine cover before beginning work.
2. Remove old transom clamp assembly by loosening the existing bolt and pin.
3. Clean the transom bracket mounting surface and inspect for wear or damage.
4. Position the new pad (6F5-43114) onto the transom bracket.
5. Insert the handle (663-43118-00) into the transom clamp slot.
6. Align the screw (6F5-43116) through the handle and bracket.
7. Insert the pin (90243-04007) to secure the handle pivot point.
8. Install the bolt (90109-06M12) and tighten to manufacturer's torque specification.
9. Test clamp operation by opening and closing the handle several times to verify smooth movement.
10. Ensure the engine is securely mounted to the transom before operation.

Troubleshooting & FAQ

How do I know if this clamp assembly fits my Yamaha outboard?

Verify your engine's horsepower rating (40, 48, 55, or 60HP 2-stroke) and confirm the original part number matches 663-43118-01 or 6F5-43116-00. Check your engine model plate or service manual for compatibility.

Can I use this on a 4-stroke Yamaha engine?

This assembly is specifically designed for 2-stroke Yamaha engines rated 40–60HP. For 4-stroke applications, consult your parts diagram to confirm the correct transom clamp specification.

What should I do if the clamp handle feels loose after installation?

Check that the pin (90243-04007) is fully seated and the bolt (90109-06M12) is torqued to specification. Inspect the pad for proper alignment and verify all components are assembled in the correct order.

How often should the transom clamp assembly be replaced?

Replace when you notice difficulty opening or closing the clamp, visible cracks or corrosion, or if the engine does not stay securely locked to the transom. Annual inspections are recommended for saltwater use.

Is thread locker required on the bolt?

Yes, apply marine-grade thread locker to the bolt threads to prevent loosening from vibration. Follow the manufacturer's recommended torque values during installation.

Will this clamp work with tilt/trim systems?

This assembly is compatible with engines that include tilt/trim mechanisms, provided your model originally used part numbers 663-43118-01 or 6F5-43116-00. Verify against your engine's parts diagram.

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 against 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.