Timing Belt – Fits Yamaha 25HP-70HP 4-Stroke Outboards (Replaces 6C5-46241-00)
Timing Belt – Fits Yamaha 25HP-70HP 4-Stroke Outboards (Replaces 6C5-46241-00) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Timing Belt – Fits Yamaha 25HP-70HP 4-Stroke Outboards (Replaces 6C...
Timing Belt – Fits Yamaha 25HP-70HP 4-Stroke Outboards (Replaces 6C5-46241-00) is backordered and will ship as soon as it is back in stock.
Product Details
This replacement Engine Timing Belt – Fits Yamaha 25HP-70HP 4-Stroke Outboards is designed for a wide range of Yamaha engines from 2005 to 2017. It is compatible with F25, T25, F30, F40, F50, T50, F60, T60, F70, and MURENA EFI 40XSR/70 models, ensuring reliable performance for maintaining engine timing.
This belt is a direct replacement for Yamaha part number 6C5-46241-00 (also listed as 6C54624100) and aftermarket equivalent Sierra 18-15130.
- Installation Method: Serpentine
- Manufacturing Standard: ISO9002 Certified
- Construction: Synthetic rubber compound without internal wire reinforcement
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 6C5-46241-00 |
| Yamaha | 6C54624100 |
| Sierra | 18-15130 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is designed for the following Yamaha 4-Stroke models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F25 | 25 | 4-Stroke | 2009–2017 | 6C5-46241-00 | |
| Yamaha | T25 | 25 | 4-Stroke | 2009–2017 | 6C5-46241-00 | High thrust model |
| Yamaha | F30 | 30 | 4-Stroke | 2013–2017 | 6C5-46241-00 | |
| Yamaha | F40 | 40 | 4-Stroke | 2008–2017 | 6C5-46241-00 | |
| Yamaha | F50 | 50 | 4-Stroke | 2005–2017 | 6C5-46241-00 | |
| Yamaha | T50 | 50 | 4-Stroke | 2005–2010 | 6C5-46241-00 | High thrust model |
| Yamaha | F60 | 60 | 4-Stroke | 2005–2017 | 6C5-46241-00 | |
| Yamaha | T60 | 60 | 4-Stroke | 2005–2017 | 6C5-46241-00 | High thrust model |
| Yamaha | F70 | 70 | 4-Stroke | 2010–2017 | 6C5-46241-00 | |
| Yamaha | MURENA EFI 40XSR/70 | 40/70 | 4-Stroke | 2005+ | 6C5-46241-00 |
Technical Specs
- Product Type
- Engine Timing Belt
- Installation
- Serpentine
- Number of Teeth
- 94
- Housing Material
- Synthetic Rubber Compound
- Weight
- 1.0 lbs (0.45 kg)
- OEM Specifications
- ISO9002 certified manufacturing
- Warranty
- 1-year against manufacturing defects
- Other Technical Attributes
- No internal wire reinforcement
What’s in the Box
- 1 x Timing Belt (6C5-46241-00)
Installation Notes
- Ensure the engine is off and completely cool. Disconnect the battery.
- Loosen the alternator pivot bolt and any tensioner bolts.
- Note the belt's path around the pulleys before removal.
- Relieve tension by swiveling the alternator or tensioner, then slip the old belt off.
- Inspect and clean all pulley grooves to ensure they are free of debris, rust, or wear.
- Route the new belt following the original path, ensuring it is seated in all grooves.
- Tension the new belt by swiveling the alternator. Proper tension is about 1 cm (½″) of deflection under moderate thumb pressure on the longest span.
- Tighten the adjuster plate bolt first, then the main pivot bolt to factory torque specifications.
- Reconnect the battery.
- Start the engine and observe the belt to ensure it is tracking correctly and running smoothly.
- Shut down the engine and recheck tension, as a new belt may stretch slightly after its initial run.
Troubleshooting & FAQ
How do I confirm this belt fits my engine?
Verify your engine's model, horsepower, and year against the "Engine & Model Compatibility" table. You should also cross-reference your existing part number with the "Part Number Matrix" to ensure it's a match.
What are common signs of a worn or failing timing belt?
Inspect your current belt for signs of wear such as cracking, fraying, glazing (a shiny surface), or missing teeth. You might also hear ticking or high-pitched sounds from the engine bay, which can indicate a problem.
What is the recommended replacement interval for this belt?
While a maximum service interval isn't specified, standard marine practice is to inspect the timing belt annually and replace it every 500-1000 operating hours or every 3-5 years, whichever comes first, especially in saltwater environments.
Is this belt different from the original Yamaha part?
This is an aftermarket part built to meet or exceed OEM specifications using a durable synthetic rubber compound. Unlike some factory belts, it does not feature internal wire reinforcement, but it is manufactured in an ISO 9002 certified facility for quality assurance.
Can I install this timing belt myself?
Yes, installation is achievable for individuals with good mechanical skills. Please follow the installation steps carefully and ensure the belt is tensioned correctly. If you are unsure, we recommend consulting a professional marine mechanic.
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 vs 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.
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