Engine Timing Belt – Fits Yamaha F9.9, FT9.9, T9.9 Outboards (Replaces 6G8-46241-00-00)

Engine Timing Belt – Fits Yamaha F9.9, FT9.9, T9.9 Outboards

This engine timing belt is a high-quality replacement for Yamaha 4-stroke 9.9 HP outboards, including models F9.9, FT9.9 (High Thrust), and T9.9 manufactured between 1985 and 2005. It ensures precise synchronization between the camshaft and crankshaft, which is essential for optimal engine performance and longevity.

It serves as a direct replacement for Yamaha part number 6G8-46241-00-00 and Sierra part number 18-15133, offering a reliable fit and function equivalent to the original component.

• Installation Method: Direct OEM Replacement
• Key Function: Synchronizes camshaft and crankshaft rotation
• Package Includes: 1 x Engine Timing Belt

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 Engine Timing Belt (Replaces 6G8-46241-00-00)

Installation Guide

1. Safety First: Disconnect the battery terminals and ensure the engine is cool. Disconnect the spark plug wires to prevent accidental starting.
2. Access the Belt: Remove the engine cover (cowling) and any other components obstructing access to the timing belt cover, such as the flywheel cover or recoil starter assembly.
3. Align Timing Marks: Carefully rotate the crankshaft to align the timing marks on the camshaft pulley and the crankshaft gear with the marks on the engine block. This is a critical step for correct engine timing.
4. Release Tension: Loosen the timing belt tensioner bolt to release the tension on the old belt.
5. Remove Old Belt: Carefully slide the old timing belt off the pulleys.
6. Install New Belt: Slide the new belt into place, starting with the crankshaft gear and then routing it around the camshaft pulley. Ensure the belt's directional arrows (if present) are pointing in the direction of engine rotation.
7. Apply Tension: Re-engage the tensioner to apply the correct tension to the new belt. Tighten the tensioner bolt to the manufacturer's specified torque.
8. Verify Alignment: Rotate the crankshaft by hand two full rotations and re-check that all timing marks are perfectly aligned. If they are not, you must repeat the process.
9. Reassemble: Re-install all covers and components that were removed.
10. Final Check: Reconnect the spark plug wires and battery. Start the engine and listen for any unusual noises, then check for smooth idling.

Troubleshooting & FAQ

How do I confirm this timing belt fits my engine?
First, check your original part for the number 6G8-46241-00-00. Next, consult our "Compatible Engine Models" table on this page. Use our Yamaha serial number guide to confirm your exact model and year range (1985-2005 for F9.9/FT9.9/T9.9 models).

What are the signs of a failing timing belt?
Common signs include a ticking noise coming from the engine, rough idling, misfires, or a complete failure to start. A visual inspection may reveal cracks, fraying, or missing teeth on the belt.

How often should I replace my outboard's timing belt?
Refer to your Yamaha owner's manual for the recommended service interval, which is typically every 5 years or 1000 hours of operation, whichever comes first. Proactive replacement is crucial to prevent catastrophic engine damage.

My engine is a post-2005 F9.9 model. Will this belt fit?
No. This belt is specifically for models up to April 2005. Newer models (F9.9-2, T9.9-2) require the superseded part number 66M-46241-00-00.

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.