6G8-46241-00 Timing Belt for Yamaha F8A-B F9.9A-B | JLM Marine

Timing Belt for Yamaha F8A-B F9.9A-B Marine Outboard Engine – Replaces 6G8-46241-00

This aftermarket timing belt is engineered for Yamaha F8A-B and F9.9A-B outboard engines, delivering reliable performance and precise timing control. Designed to meet OEM specifications, it ensures smooth operation and extends engine life.

Direct Replacements: Yamaha 6G8-46241-00, Sierra 18-15133. This timing belt provides a cost-effective alternative to OEM parts while maintaining quality and durability.

• Fits Yamaha F8A-B and F9.9A-B outboard models
• Manufactured to OEM specifications for reliable performance
• Essential component for maintaining proper engine timing

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 × Timing Belt

Installation Guide

1. Disconnect the battery and ensure the engine is completely cool before starting work.
2. Remove the engine cover and any shrouds or components obstructing access to the timing belt area.
3. Locate and remove the timing belt cover by unscrewing the retaining bolts. Keep all fasteners organized for reassembly.
4. Rotate the crankshaft to align timing marks on the camshaft and crankshaft gears according to your service manual.
5. Release tension on the old timing belt by loosening the tensioner assembly. Remove the old belt carefully.
6. Inspect the tensioner, idler pulleys, and gears for wear or damage; replace if necessary before installing the new belt.
7. Install the new timing belt by routing it around the crankshaft and camshaft gears, ensuring proper engagement with all teeth.
8. Verify timing marks are still aligned after the belt is seated. Double-check alignment before proceeding.
9. Apply proper tension to the new belt using the tensioner assembly according to manufacturer specifications.
10. Reinstall the timing belt cover and secure with all retaining bolts. Tighten to specification.
11. Reassemble all components in reverse order, including shrouds and engine cover.
12. Reconnect the battery and test-run the engine to confirm smooth operation and proper timing.

Troubleshooting & FAQ

Q: How do I confirm this timing belt fits my Yamaha outboard?
A: Verify your engine model is F8A-B or F9.9A-B and cross-reference your current part number with Yamaha 6G8-46241-00 or Sierra 18-15133. Check the compatibility table above or consult your engine's parts diagram.

Q: How often should I replace the timing belt?
A: Follow your Yamaha service manual recommendations, typically every 3–5 years or based on operating hours. Regular inspection is essential; replace immediately if you notice cracks, fraying, or excessive wear.

Q: What are the signs of a failing timing belt?
A: Symptoms include rough idling, misfires, difficulty starting, unusual engine noises, or loss of power. If you notice any of these signs, inspect the timing belt immediately to prevent engine damage.

Q: Can I install this timing belt myself?
A: Installation requires mechanical knowledge and proper tools to align timing marks accurately. Incorrect installation can cause severe engine damage, so professional installation is recommended unless you have experience with timing belt replacement.

Q: What's the difference between this aftermarket timing belt and the OEM version?
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.