CDI Unit Assy – Fits Yamaha 25HP/30HP 2-Stroke Outboards (Replaces 61N-85540-00/10/11/12/13)
CDI Unit Assy – Fits Yamaha 25HP/30HP 2-Stroke Outboards (Replaces 61N-85540-00/10/11/12/13) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
CDI Unit Assy – Fits Yamaha 25HP/30HP 2-Stroke Outboards (Replaces ...
Product Details
This CDI Unit Assy – Fits Yamaha 25HP/30HP 2-Stroke Outboards is an essential electronic component designed to restore ignition performance on a range of Yamaha 2-stroke 25HP and 30HP outboard engines manufactured between 1993 and 2006. It directly fits models including C25, C30, E25B, E30H, 25B, and 30H.
It serves as a direct cross-reference for multiple Yamaha OEM part numbers, including the entire 61N-85540 series from -00 through the latest supersession, -13.
- Engineered for direct plug-and-play installation.
- Controls ignition timing for 2-cylinder gasoline outboard engines.
- Includes one CDI Unit Assembly as pictured.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Yamaha | 61N-85540-00-00 | 61N-85540-13-00 | Original part number |
| Yamaha | 61N-85540-10-00 | 61N-85540-13-00 | First supersession |
| Yamaha | 61N-85540-11-00 | 61N-85540-13-00 | Second supersession |
| Yamaha | 61N-85540-12-00 | 61N-85540-13-00 | Third supersession |
| Yamaha | 61N-85540-13-00 | Latest OEM replacement part |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | C25 | 25 | 2-Stroke | 1993–2006 | 61N-85540-00/10/11/12/13 | Various part supersessions |
| Yamaha | C30 | 30 | 2-Stroke | 1993–1996 | 61N-85540-00/10/11/12/13 | Models include C30ERR, C30MHS, C30ERS, C30ELRT, C30ERU |
| Yamaha | E25B | 25 | 2-Stroke | 1993–2006 | 61N-85540-13 | Later production model |
| Yamaha | E30H | 30 | 2-Stroke | 1993–2006 | 61N-85540-13 | Later production model |
| Yamaha | 25B | 25 | 2-Stroke | 1993–2006 | 61N-85540-13 | Later production model |
| Yamaha | 30H | 30 | 2-Stroke | 1993–2006 | 61N-85540-13 | Later production model |
Technical Specs
- Product Type
- CDI Unit Assembly
- Installation
- Direct OEM replacement
- Fuel Type
- For gasoline engines
- Engine Type
- 2-Stroke outboard
- Housing Material
- Metal with plastic connectors
- Housing Color
- Black
- Dimensions
- 9.5 cm L x 11.0 cm W x 6.5 cm H
- Other Technical Attributes
- Electronic ignition control module for 2-cylinder outboard engines
What’s in the Box
- 1 x CDI Unit Assembly (Replaces 61N-85540-00/10/11/12/13)
Installation Notes
- Disconnect the battery terminals to prevent electrical shorts.
- Locate and unplug the old CDI unit from the engine's wiring harness.
- Unbolt and remove the old unit from its mounting point.
- Mount the new CDI unit securely in the same location.
- Connect the new unit's plugs to the wiring harness, ensuring a snug fit.
- Reconnect the battery terminals.
- Test the engine to confirm proper ignition function before operation.
Troubleshooting & FAQ
How do I know if this CDI unit fits my engine?
First, check the Engine & Model Compatibility table on this page. Your engine's model, horsepower, and year should be listed. Second, visually compare your old part to our product images to ensure the plugs and housing match. If there are any differences, do not purchase.
What are the signs of a failing CDI unit?
Common symptoms of a faulty CDI module include no spark to the spark plugs, engine misfiring at various RPMs, intermittent stalling, difficulty starting, or a complete loss of power. These issues occur because the CDI is responsible for controlling the precise timing of the ignition spark.
What is the difference between part numbers like 61N-85540-10 and 61N-85540-13?
These numbers represent a supersession chain from Yamaha. The number ending in -10, -11, etc., were earlier versions, while 61N-85540-13 is the latest and final revision from the manufacturer. This aftermarket part is designed to be a direct replacement for all of them, offering the same fit and function.
Can I install this part myself?
While installation can be straightforward for those with mechanical experience, we recommend professional installation. This ensures all connections are secure, and the ignition system is correctly diagnosed and functioning safely. Improper installation can lead to engine damage or electrical issues.
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.
Payment & Security
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