CDI Unit – Fits Yamaha 8HP/9.9HP 4-Stroke Outboard Motors (Replaces 68T-85540-00)
CDI Unit – Fits Yamaha 8HP/9.9HP 4-Stroke Outboard Motors (Replaces 68T-85540-00) is backordered and will ship as soon as it is back in stock.
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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 – Fits Yamaha 8HP/9.9HP 4-Stroke Outboard Motors (Replaces...
Product Details
This CDI Unit – Fits Yamaha 8HP/9.9HP 4-Stroke Outboard Motors (Replaces 68T-85540-00) is an electronic ignition control module for Yamaha 4-stroke outboard motors in the 8HP and 9.9HP range. It's designed to manage spark timing for optimal engine performance, fitting models primarily produced between 2001 and 2021.
It serves as a direct replacement for Yamaha OEM part numbers 68T-85540-00, 68T-85540-00-00, 68T-85540, and 68T8554000.
- Engineered for direct OEM replacement and bolt-on mounting.
- Controls spark timing via a multi-pin electrical connector.
- Includes one CDI unit assembly required for installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 68T-85540-00 |
| Yamaha | 68T-85540-00-00 |
| Yamaha | 68T-85540 |
| Yamaha | 68T8554000 |
| Yamaha | 68T85540 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is compatible with various Yamaha 4-stroke 8HP and 9.9HP outboard engines. Please verify your specific model and production year before ordering.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F8LMHB | 8 | 4-Stroke | 2015–2021 | 68T-85540-00 | |
| Yamaha | F8SMHB | 8 | 4-Stroke | 2015–2021 | 68T-85540-00 | |
| Yamaha | F8CMLH | 8 | 4-Stroke | 2008–2010 | 68T-85540-00 | |
| Yamaha | F8CMSH | 8 | 4-Stroke | 2007–2009 | 68T-85540-00 | |
| Yamaha | F8LMHA | 8 | 4-Stroke | 2011–2014 | 68T-85540-00 | |
| Yamaha | F8MLHB | 8 | 4-Stroke | 2003 | 68T-85540-00 | |
| Yamaha | F8MSH | 8 | 4-Stroke | 2005–2006 | 68T-85540-00 | |
| Yamaha | F8MSHA | 8 | 4-Stroke | 2002 | 68T-85540-00 | |
| Yamaha | F8MSHB | 8 | 4-Stroke | 2003 | 68T-85540-00 | |
| Yamaha | F8SMHA | 8 | 4-Stroke | 2011–2014 | 68T-85540-00 | |
| Yamaha | T8DELH | 8 | 4-Stroke | 2007–2010 | 68T-85540-00 | |
| Yamaha | T8DEXH | 8 | 4-Stroke | 2007–2009 | 68T-85540-00 | |
| Yamaha | T8DPLH | 8 | 4-Stroke | 2007–2010 | 68T-85540-00 | |
| Yamaha | T8DPLR | 8 | 4-Stroke | 2009–2010 | 68T-85540-00 | |
| Yamaha | T8DPXH | 8 | 4-Stroke | 2007–2009 | 68T-85540-00 | |
| Yamaha | T8DPXR | 8 | 4-Stroke | 2010 | 68T-85540-00 | |
| Yamaha | T8ELH | 8 | 4-Stroke | 2005 | 68T-85540-00 | |
| Yamaha | T8ELHB | 8 | 4-Stroke | 2003 | 68T-85540-00 | |
| Yamaha | T8ELHC | 8 | 4-Stroke | 2004 | 68T-85540-00 | |
| Yamaha | T8ELHD | 8 | 4-Stroke | 2005 | 68T-85540-00 | |
| Yamaha | T8ELHA | 8 | 4-Stroke | 2002 | 68T-85540-00 | |
| Yamaha | T8EXHD | 8 | 4-Stroke | 2005 | 68T-85540-00 | |
| Yamaha | T8PLH | 8 | 4-Stroke | 2005–2006 | 68T-85540-00 | |
| Yamaha | T8PLHD | 8 | 4-Stroke | 2005 | 68T-85540-00 | |
| Yamaha | T8PLR | 8 | 4-Stroke | 2005–2006 | 68T-85540-00 | |
| Yamaha | T8PLRB | 8 | 4-Stroke | 2003 | 68T-85540-00 | |
| Yamaha | T8PLRD | 8 | 4-Stroke | 2005 | 68T-85540-00 | |
| Yamaha | T8PLRZ | 8 | 4-Stroke | 2001 | 68T-85540-00 | |
| Yamaha | T8PXH | 8 | 4-Stroke | 2006 | 68T-85540-00 | |
| Yamaha | T8PXHA | 8 | 4-Stroke | 2002 | 68T-85540-00 | |
| Yamaha | T8PXHD | 8 | 4-Stroke | 2005 | 68T-85540-00 | |
| Yamaha | T8PXHZ | 8 | 4-Stroke | 2001 | 68T-85540-00 | |
| Yamaha | T8PXRA | 8 | 4-Stroke | 2002 | 68T-85540-00 | |
| Yamaha | T8PXRB | 8 | 4-Stroke | 2003 | 68T-85540-00 | |
| Yamaha | T8PXRD | 8 | 4-Stroke | 2005 | 68T-85540-00 | |
| Yamaha | T8PXRZ | 8 | 4-Stroke | 2001 | 68T-85540-00 | |
| Yamaha | F9.9FELR | 9.9 | 4-Stroke | 2008 | 68T-85540-00 | |
| Yamaha | F9.9FMLH | 9.9 | 4-Stroke | 2010 | 68T-85540-00 | |
| Yamaha | F9.9FMSH | 9.9 | 4-Stroke | 2007–2010 | 68T-85540-00 | |
| Yamaha | F9.9LEA | 9.9 | 4-Stroke | 2011 | 68T-85540-00 | |
| Yamaha | F9.9LEB | 9.9 | 4-Stroke | 2013–2021 | 68T-85540-00 | |
| Yamaha | F9.9LEHB | 9.9 | 4-Stroke | 2014 | 68T-85540-00 | |
| Yamaha | F9.9LMHA | 9.9 | 4-Stroke | 2012 | 68T-85540-00 | |
| Yamaha | F9.9LMHB | 9.9 | 4-Stroke | 2013–2021 | 68T-85540-00 | |
| Yamaha | F9.9SMHA | 9.9 | 4-Stroke | 2011 | 68T-85540-00 | |
| Yamaha | F9.9SMHB | 9.9 | 4-Stroke | 2014–2022 | 68T-85540-00 | |
| Yamaha | T9.9GELH | 9.9 | 4-Stroke | 2010 | 68T-85540-00 | |
| Yamaha | T9.9GEXH | 9.9 | 4-Stroke | 2007–2010 | 68T-85540-00 | |
| Yamaha | T9.9GPLR | 9.9 | 4-Stroke | 2007–2010 | 68T-85540-00 | |
| Yamaha | T9.9GPXH | 9.9 | 4-Stroke | 2007–2010 | 68T-85540-00 | |
| Yamaha | T9.9GPXR | 9.9 | 4-Stroke | 2008–2010 | 68T-85540-00 | |
| Yamaha | T9.9LEHA | 9.9 | 4-Stroke | 2011–2012 | 68T-85540-00 | |
| Yamaha | T9.9LEHB | 9.9 | 4-Stroke | 2013–2016 | 68T-85540-00 | |
| Yamaha | T9.9LPA | 9.9 | 4-Stroke | 2011–2012 | 68T-85540-00 | |
| Yamaha | T9.9LPB | 9.9 | 4-Stroke | 2016–2022 | 68T-85540-00 | |
| Yamaha | T9.9LPHA | 9.9 | 4-Stroke | 2011–2012 | 68T-85540-00 | |
| Yamaha | T9.9LPHB | 9.9 | 4-Stroke | 2015–2021 | 68T-85540-00 | |
| Yamaha | T9.9LWHB | 9.9 | 4-Stroke | 2017–2020 | 68T-85540-00 | |
| Yamaha | T9.9XPA | 9.9 | 4-Stroke | 2012 | 68T-85540-00 | |
| Yamaha | T9.9XPB | 9.9 | 4-Stroke | 2014–2021 | 68T-85540-00 | |
| Yamaha | T9.9XEHA | 9.9 | 4-Stroke | 2011–2012 | 68T-85540-00 | |
| Yamaha | T9.9XEHB | 9.9 | 4-Stroke | 2013–2016 | 68T-85540-00 | |
| Yamaha | T9.9XPHA | 9.9 | 4-Stroke | 2011–2012 | 68T-85540-00 | |
| Yamaha | T9.9XPHB | 9.9 | 4-Stroke | 2013–2022 | 68T-85540-00 | |
| Yamaha | T9.9XWHB | 9.9 | 4-Stroke | 2017–2022 | 68T-85540-00 |
Technical Specs
- Product Type
- CDI Unit (Capacitor Discharge Ignition)
- Installation
- Direct OEM replacement
- Fuel Type
- Gasoline (Petrol)
- Connection
- Multi-pin electrical connector
- Housing Color
- Black
- Dimensions
- 10.5 x 10.5 x 10.5 cm
- Fitting Type
- Bolt-on mount
- Other Technical Attributes
- Electronic ignition control module
What’s in the Box
- 1 x CDI Unit Assembly
Installation Notes
- Disconnect the battery terminals to prevent electrical hazards.
- Locate the existing CDI unit on the engine block. Note the wiring connections.
- Carefully unplug the electrical connector(s) from the old unit.
- Unbolt and remove the old CDI unit from its mounting point.
- Mount the new CDI unit, ensuring it is securely fastened.
- Reconnect the electrical connector(s) firmly.
- Reconnect the battery terminals.
- Start the engine to test the new CDI unit and check for proper ignition timing and performance.
Troubleshooting & FAQ
How do I know if my CDI unit has failed?
Common symptoms of a faulty CDI include engine misfires, difficulty starting (or no-start), intermittent stalling, weak or no spark, and a reduction in overall engine power.
Will this fit both 8HP and 9.9HP models?
Yes, this unit is designed for a range of Yamaha 4-stroke outboards from 8HP to 9.9HP. Refer to the detailed compatibility table to confirm it fits your specific engine model and year.
Is any programming required for this CDI unit?
No, this is a plug-and-play component. It comes pre-programmed to match the OEM ignition curve and requires no additional setup.
What is the main difference between this and an OEM part?
This is an aftermarket part built to meet or exceed original manufacturer specifications for fit, form, and function. It provides a reliable, cost-effective alternative to the genuine OEM component.
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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