Timing Belt – Fits Yamaha F300/F350 V8 Outboards (Replaces 6AW-W4624-00-00, 6AW-46241-00-00)

Timing Belt – Fits Yamaha F300/F350 V8 Outboards

This aftermarket timing belt is engineered to meet or exceed OEM specifications for Yamaha 4-Stroke outboards, including the F300 4.2L V6 and F350 5.3L V8 models from 2006 to the present. It ensures precise engine timing for reliable performance and longevity.

This component is a direct replacement for Yamaha part numbers 6AW-W4624-00-00 and 6AW-46241-00-00, as well as Sierra part number 18-15139.

• Installation Method: Direct OEM-style replacement
• Fuel Compatibility: Designed for gasoline engines
• Included Components: Comes with the necessary rotor bolts for a complete installation

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

• 1 x Timing Belt with Rotor Bolts (Replaces 6AW-W4624-00-00)

Installation Guide

Professional installation is highly recommended. The following steps are for reference purposes only.

1. Safety First: Disconnect the battery terminals and ensure the engine has completely cooled down.
2. Access the Belt: Remove the engine cowling and any flywheel covers necessary to gain clear access to the timing belt area.
3. Align Timing Marks: Carefully rotate the engine to align the timing marks on the crankshaft and camshaft sprockets. Confirm they are perfectly aligned before proceeding.
4. Remove Old Belt: Loosen the bolt on the tensioner pulley to release tension, then carefully slide the old timing belt off the sprockets.
5. Inspect Components: Check the tensioner and idler pulleys for any signs of wear, wobble, or damage. Replace them if they are not in perfect condition.
6. Install New Belt: Route the new timing belt correctly around all sprockets, ensuring the teeth are properly engaged.
7. Apply Tension: Re-apply tension to the belt according to your engine's service manual specifications. Warning: Overtightening can cause premature failure.
8. Verify Alignment: Double-check that all timing marks are still perfectly aligned after tensioning the belt.
9. Final Check: Manually rotate the crankshaft two full revolutions clockwise and re-verify that the timing marks align perfectly once more.
10. Reassemble: Reinstall the flywheel cover, engine cowling, and any other removed components.
11. Test Operation: Reconnect the battery, start the engine, and let it idle to confirm smooth operation and check for unusual noises.

Troubleshooting & FAQ

How do I confirm this timing belt fits my Yamaha V6/V8?
The best way to ensure compatibility is to verify your engine's model and year against the "Compatible Engine Models" table on this page. Additionally, cross-reference your existing part number with those listed in the "Part Number Cross-Reference" section. If you are uncertain, use our Yamaha diagrams to visually confirm the part.

How often should I replace the timing belt on my Yamaha outboard?
As a general maintenance guideline, Yamaha recommends inspecting the timing belt every 200 hours and replacing it every 1000 hours or 5 years, whichever comes first. However, you should always consult your specific engine's service manual for the exact recommended interval.

What are the signs of a failing timing belt?
Common symptoms include a ticking or clicking noise from the engine, engine misfires, difficulty starting, rough idling, or visible damage to the belt itself (cracking, fraying, or missing teeth). A failed timing belt can cause catastrophic engine damage, so it is critical to replace it as part of preventative maintenance.

Does this kit include the rotor bolts required for installation?
Yes, this timing belt kit includes the necessary rotor bolts. You will receive both the belt and bolts as shown in the product images and described in the "Package Contents" section.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.