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Description
66M-85540-01 CDI Unit for Yamaha F9.9 F15 T9.9 | JLM MarineCDI Unit for Yamaha F9. 9 F15 T9. 9 Replaces 66M 85540 01 This aftermarket CDI Unit is designed for Yamaha 4 stroke outboard engines, including F9. 9, F15, and T9. 9 models from 2000 and later. Engineered to meet OEM specifications, this ignition control module ensures reliable spark timing and smooth engine performance across a wide range of operating conditions. Direct replacement for Yamaha OEM part numbers 66M 85540 01, 66M 85540 10, and 66M 85540
CDI Unit for Yamaha F9.9 F15 T9.9 | Replaces 66M-85540-01
This aftermarket CDI Unit is designed for Yamaha 4-stroke outboard engines, including F9.9, F15, and T9.9 models from 2000 and later. Engineered to meet OEM specifications, this ignition control module ensures reliable spark timing and smooth engine performance across a wide range of operating conditions.
Direct replacement for Yamaha OEM part numbers 66M-85540-01, 66M-85540-10, and 66M-85540-01-00. Compatible with F15A 15HP engines in the 66M series, this CDI assembly delivers dependable ignition control for both recreational and commercial marine applications.
- Fits Yamaha 4-stroke outboards: F9.9HP, F15HP (F15A), and T9.9HP models
- Direct plug-and-play installation with OEM-style connectors
- Aftermarket replacement manufactured to OEM specifications
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket sources.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 66M-85540-01 | Primary OEM reference |
| Yamaha | 66M-85540-10 | Alternate OEM reference |
| Yamaha | 66M-85540-01-00 | Full OEM part number |
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.
| Brand | Model | Rated HP | Stroke | Years | Notes |
|---|---|---|---|---|---|
| Yamaha | F15ELHY | 15 | 4-Stroke | 2000 | ELECTRICAL 1 |
| Yamaha | F15ESHY | 15 | 4-Stroke | 2000 | ELECTRICAL 1 |
| Yamaha | F15MLHY | 15 | 4-Stroke | 2000 | ELECTRICAL 1 |
| Yamaha | F15MSHY | 15 | 4-Stroke | 2000 | ELECTRICAL 1 |
| Yamaha | F15ELHZ | 15 | 4-Stroke | 2001 | ELECTRICAL 1 |
| Yamaha | F15ESHZ | 15 | 4-Stroke | 2001 | ELECTRICAL 1 |
| Yamaha | F15MLHZ | 15 | 4-Stroke | 2001 | ELECTRICAL 1 |
| Yamaha | F15MSHZ | 15 | 4-Stroke | 2001 | ELECTRICAL 1 |
| Yamaha | F15PLHZ | 15 | 4-Stroke | 2001 | ELECTRICAL 1 |
| Yamaha | F15PLRZ | 15 | 4-Stroke | 2001 | ELECTRICAL 1 |
| Yamaha | F15ELHA | 15 | 4-Stroke | 2002 | ELECTRICAL 1 |
| Yamaha | F15ESHA | 15 | 4-Stroke | 2002 | ELECTRICAL 1 |
| Yamaha | F15MLHA | 15 | 4-Stroke | 2002 | ELECTRICAL 1 |
| Yamaha | F15MSHA | 15 | 4-Stroke | 2002 | ELECTRICAL 1 |
| Yamaha | F15PLHA | 15 | 4-Stroke | 2002 | ELECTRICAL 1 |
| Yamaha | F15PLRA | 15 | 4-Stroke | 2002 | ELECTRICAL 1 |
| Yamaha | F15ELHB | 15 | 4-Stroke | 2003 | ELECTRICAL 1 |
| Yamaha | F15ESHB | 15 | 4-Stroke | 2003 | ELECTRICAL 1 |
| Yamaha | F15MLHB | 15 | 4-Stroke | 2003 | ELECTRICAL 1 |
| Yamaha | F15MSHB | 15 | 4-Stroke | 2003 | ELECTRICAL 1 |
| Yamaha | F15PLHB | 15 | 4-Stroke | 2003 | ELECTRICAL 1 |
| Yamaha | F15PLRB | 15 | 4-Stroke | 2003 | ELECTRICAL 1 |
| Yamaha | F15ELHC | 15 | 4-Stroke | 2004 | ELECTRICAL 1 |
| Yamaha | F15ESHC | 15 | 4-Stroke | 2004 | ELECTRICAL 1 |
| Yamaha | F15MLHC | 15 | 4-Stroke | 2004 | ELECTRICAL 1 |
| Yamaha | F15MSHC | 15 | 4-Stroke | 2004 | ELECTRICAL 1 |
| Yamaha | F15PLHC | 15 | 4-Stroke | 2004 | ELECTRICAL 1 |
| Yamaha | F15PLRC | 15 | 4-Stroke | 2004 | ELECTRICAL 1 |
| Yamaha | F15ELHD | 15 | 4-Stroke | 2005 | ELECTRICAL 1 |
| Yamaha | F15ESHD | 15 | 4-Stroke | 2005 | ELECTRICAL 1 |
| Yamaha | F15MLHD | 15 | 4-Stroke | 2005 | ELECTRICAL 1 |
| Yamaha | F15MSHD | 15 | 4-Stroke | 2005 | ELECTRICAL 1 |
| Yamaha | F15PLHD | 15 | 4-Stroke | 2005 | ELECTRICAL 1 |
| Yamaha | F15PLRD | 15 | 4-Stroke | 2005 | ELECTRICAL 1 |
| Yamaha | F9.9ELR2D | 9.9 | 4-Stroke | 2005 | ELECTRICAL 1 |
| Yamaha | F9.9MLH2D | 9.9 | 4-Stroke | 2005 | ELECTRICAL 1 |
| Yamaha | F9.9MSH2D | 9.9 | 4-Stroke | 2005 | ELECTRICAL 1 |
| Yamaha | T9.9ELH2D | 9.9 | 4-Stroke | 2005 | ELECTRICAL 1 |
| Yamaha | T9.9ELR2D | 9.9 | 4-Stroke | 2005 | ELECTRICAL 1 |
| Yamaha | T9.9EXH2D | 9.9 | 4-Stroke | 2005 | ELECTRICAL 1 |
| Yamaha | F15ELH | 15 | 4-Stroke | 2006 and Later | ELECTRICAL 1 / 1Z |
| Yamaha | F15ELHK | 15 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F15ESH | 15 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F15ESHK | 15 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F15MLH | 15 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F15MLHK | 15 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F15MSH | 15 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F15MSHK | 15 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F15PLH | 15 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F15PLHK | 15 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F15PLR | 15 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F15PLRK | 15 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F9.9ELR2 | 9.9 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F9.9ELR2K | 9.9 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F9.9MLH2 | 9.9 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F9.9MLH2K | 9.9 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F9.9MSH2 | 9.9 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | F9.9MSH2K | 9.9 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | T9.9ELH2 | 9.9 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | T9.9ELH2K | 9.9 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | T9.9ELR2 | 9.9 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | T9.9ELR2K | 9.9 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | T9.9EXH2 | 9.9 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
| Yamaha | T9.9EXH2K | 9.9 | 4-Stroke | 2006 and Later | ELECTRICAL 1 |
Technical Specifications
| Specification | Value |
|---|---|
| Part Type | CDI Unit (Ignition Control Module) |
| OEM Reference | 66M-85540-01, 66M-85540-10, 66M-85540-01-00 |
| Engine Type | 4-Stroke |
| Compatible Models | Yamaha F9.9, F15, T9.9 |
| Year Range | 2000 and Later |
| Manufacture Type | Aftermarket Replacement |
Package Contents
- 1 × CDI Unit Assembly
Installation Guide
- Disconnect the battery: Turn off the engine and disconnect the negative battery terminal to prevent electrical shock or short circuits.
- Locate the existing CDI unit: Refer to your engine's service manual or parts diagram to identify the CDI unit mounting location.
- Remove the engine cover: Carefully remove any cowling or protective covers to access the electrical components.
- Disconnect electrical connectors: Unplug all wiring harness connectors from the old CDI unit; note connector orientations for correct reinstallation.
- Remove mounting hardware: Unbolt or unscrew the CDI unit from its mounting bracket or base.
- Install the new CDI unit: Position the replacement unit in the same location and secure it with the original hardware; torque fasteners to manufacturer specifications if available.
- Reconnect wiring harness: Plug in all electrical connectors firmly until they click into place; ensure no pins are bent or corroded.
- Reinstall engine covers: Replace the cowling and any protective covers removed earlier.
- Reconnect the battery: Attach the negative battery terminal and ensure a secure connection.
- Test the engine: Start the engine and verify smooth ignition, idle, and throttle response; listen for any irregular firing or misfires.
- Inspect for error codes: If your engine has a diagnostic system, check for any fault codes and clear them if necessary.
- Final checks: Confirm all connectors are secure and no warning lights remain illuminated on the instrument panel.
Troubleshooting & FAQ
Q: How do I confirm this CDI unit fits my Yamaha engine?
A: Cross-reference your engine model and year with the compatibility table above. You can also check your current CDI unit's part number (stamped on the unit itself) against 66M-85540-01, 66M-85540-10, or 66M-85540-01-00. For additional verification, consult the Yamaha parts diagrams linked in the Compatible Engine Models section.
Q: What are the signs of a failing CDI unit?
A: Common symptoms include difficulty starting, intermittent or complete loss of spark, rough idling, engine misfires at certain RPM ranges, or sudden stalling. If you experience these issues after ruling out spark plugs, ignition coils, and wiring faults, the CDI unit may be the cause.
Q: How often should I replace the CDI unit?
A: CDI units typically do not require scheduled replacement and should last the lifetime of the engine under normal conditions. Replace only when failure symptoms occur or if the unit has been exposed to water ingress, electrical surges, or physical damage.
Q: Will this aftermarket CDI perform the same as the original Yamaha part?
A: Yes, this unit is manufactured to OEM specifications using comparable-grade components. It provides the same ignition timing and spark control as the original part. However, always verify fitment and part number compatibility before installation.
Q: Can I install this CDI unit myself, or do I need a professional?
A: If you have basic mechanical skills and familiarity with outboard electrical systems, you can perform the installation using the steps provided. However, professional installation is recommended to ensure correct wiring connections and to avoid potential ignition or safety issues.
Q: Is this an OEM part or an aftermarket replacement?
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.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 9 reviews
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Product Reviews
★★★★★ 5
Stop complaining about the size and review the actual product! (Rant, Review, & Recipe)
Flavor Name: Culinary, Size: 1.06 oz (Pack of 1), Flavor Name: Culinary, Size: 1.06 oz (Pack of 1)
I was a little hesitant at first to buy this starter size pouch because of the price. I wanted good quality but kept asking myself, "What if I don't like it?" The company offers a 100% refund on their product so I went for it. Problem solved!
RANT: The biggest complaint I see from people on here is in regards to the amount you are getting for the price. They are not reviewing the quality of the item within the packaging or the flavor, etc. If you don't review the actual product and focus only on the quantity or packaging, the review is mostly worthless. As consumers, we get enough worthless reviews that are paid for, we don't need more worthless reviews because people only want to focus on the quantity and packaging and not review the quality. All are important in a review but the quality should be what is focused on.
Why is that that because it is a smaller size, people feel entitled to receive it for next to nothing? These are probably the same people that pay almost $2 for a 20 oz bottle of soda while the 2 liter bottle is only $1 and they don't bat an eyelash.
What they fail to understand is that making smaller sizes like this is not very cost effective for them to make. It probably costs them the same, or close to the same amount of money to purchase the bags they use for this size as it does for a larger size. These sampler sizes don't sell as well either. Unlike the bottle of soda that is "personalized" in size for the consumer to grab and go, this is a product that takes time and effort for the consumer to prepare. It is not meant to be a personalized size. If it were, people would have no problem paying for the convenience. Consumers are so spoiled and don't understand the costs associated with what it takes to import, pay the farmers a fair wage, the manpower and materials it takes to package the product, etc. I can guarantee you however, if a fair wage is not paid, someone is bound to call the 5:00 news! If you want sample sizes, fair wages, and the like, the consumer is going to have to pay for them or the company will go out of business really fast.
How many people have purchased an actual vanilla bean? Or saffron? Or truffles? No one seems to have a problem paying a high price for these items but complain about $10 for 30g of quality culinary matcha. Just like those items, a little matcha goes a long way.
It depends on how you plan to use it. If you are going to bake with it, buying a starter size is not cost effective for you.
If you are using it to make a tea latte, which is why I bought it, this is still gives you enough for 15 lattes that are 16 oz in size making them roughly $1.63 each (my recipe for this is below). Costs will vary depending on your ingredients of choice, and the area you live in. My numbers are based on $10 for 15 servings of this matcha and $0.08 per oz of organic vanilla almond milk in Austin, TX. Go to a coffee shop and you will pay at least $5 for a matcha latte of the same size, which is yet another thing buyers won't complain about. OK, RANT OVER...ON TO THE REVIEW!
REVIEW/COMPARISON: I used to hate the taste of Matcha but after years of taste bud readjustment, I decided to give it another try at Starbucks. They use Teavana brand for their lattes which is like Jade Leaf and does not use fillers and is organic. I try to avoid dairy so I used almond milk for my iced latte instead. Neither their tea or almond milk is sweetened so I added 3 pumps of vanilla to their venti size (they usually use 6 if you want it sweetened). Something about their almond milk leaves a bad aftertaste but before that hit, it was really good. Like most people, I can't afford $5 a day for one of these so I decided to buy the powder to make on my own at home (I was a barista in a former life so I often do this with my coffee concoctions too).
What I don't like about the Teavana brand is that it is much more expensive ($25 for 40g) and they claim it is ceremonial grade and yet, it looks and tastes exactly like Jade Leaf's culinary grade. In the brief research I did before buying, not a single self-proclaimed matcha aficionado EVER said to use ceremonial grade for a latte. They all very plainly stated that it was NOT for culinary use and that the taste is quite different. It is also higher in chlorophyll so it is a much brighter green color. That begs the question as to why Teavana, which looks and tastes the same as Jade Leaf is labeled ceremonial grade and being used for lattes when it is clearly the same culinary grade.
This morning, I made my first iced latte with this stuff from Jade Leaf. Using an organic, vanilla (sweetened) almond milk I found it was perfectly sweet and still had the very slight hint of the bitterness that comes from green tea. No weird almond milk aftertaste like the one from Starbucks. Needless to say, in the end, I will be buying this again in a larger size. It does say to store it in the fridge so that is where mine went when I was done with it. I plan to do a juice fast soon and a few recipes I have seen call for green tea for an extra metabolic and antioxidant boost. I plan to use this instead since it is so much more nutritionally dense than regular tea leaves.
RECIPE: They offer some recipe options on their Amazon listing and also on their website, but this was my super simple one that I threw together and was delicious.
Iced Matcha Vanilla Almond Latte:
4 oz (1/2 c) hot water (not boiling but barely steaming to help dissolve the matcha easily)
1 tsp Jade Leaf Organic Matcha
12 oz (1-1/2 c) cold vanilla flavored almond milk, or other milk of choice
Sweetener of choice, to taste (optional, I don't use any because my almond milk is already sweetened)
Ice cubes
NOTE: Sweetening options will have to be done at different steps depending on what you are using. If you are using liquid sugars like Torani or homemade simple syrups, those can go in at any time. Honey, agave, coconut nectar, sugar, and artificial sweeteners, should be blended in when you whisk the matcha into the hot water otherwise they will not dissolve properly and will settle at the bottom of the cup.
1. In a glass measuring cup, add 4 oz hot water.
2. Add 1 tsp of matcha powder and whisk together (see note for adding optional sweeteners)
3. Pour into a 16-20 oz cup over a few ice cubes to cool it.
4. Top off with the 12 oz vanilla almond milk (or other milk of choice) and stir to blend.
Add more ice if desired.
ENJOY Y'ALL!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 24, 2017
★★★★★ 5
Matcha Powder
Flavor Name: Culinary, Size: 1.06 oz (Pack of 1)
Jade Leaf Matcha has become my go-to matcha powder, and I keep coming back to it time and time again. The quality is consistently great, with a fresh flavor and vibrant green color that mixes well into drinks and recipes. I use it regularly for matcha lattes, smoothies, and even baking, and it always delivers great results.
For a culinary-grade matcha, I think the flavor is excellent—not overly bitter and smooth enough to enjoy daily. It blends easily and provides the perfect matcha taste without breaking the budget. I’ve tried other brands over the years, but this is the one I continue to repurchase. If you’re looking for a reliable, high-quality matcha for everyday use, I highly recommend giving this one a try.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 7, 2026
★★★★★ 5
Good taste,
Flavor Name: Culinary, Size: 3.53 oz (Pack of 1)
This matcha has a nice, rich flavor and works really well for lattes. It mixes easily without clumps and the color is vibrant. Good quality for the price and perfect for daily use.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 26, 2026
★★★★★ 4
Matcha
Flavor Name: Culinary, Size: 1.06 oz (Pack of 1)
I haven’t decided if I really like Matcha, as I got this, just to find that out. I find that the packaging is interesting, and it is best, probably, to store it in the package it comes in. It has a mild flavor, and I am just making tea with it, as I don’t bake any more. It is a bright green powder with a smooth, mild taste, and in a clever package.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 7, 2026
★★★★★ 5
A Premium Matcha Experience for the True Connoisseur
Flavor Name: Culinary, Size: 1.06 oz (Pack of 1)
I recently had the pleasure of trying the Jade Leaf Matcha Organic Premium Ceremonial Grade Matcha Green Tea Powder, and it truly lives up to its reputation as a high-quality product. As someone who enjoys matcha regularly, I was eager to compare this offering to others on the market, and I have to say I was very impressed.
The first thing I noticed was the vibrant green color of the powder. It’s a rich, deep green that is indicative of the quality and freshness of the leaves. When prepared, the tea has a smooth, silky texture and a natural sweetness that makes it enjoyable both on its own and as an addition to smoothies or lattes. I appreciate that this matcha doesn’t have the bitterness that can sometimes accompany lesser-quality varieties, making it a perfect choice for ceremonial use or a relaxing daily treat.
As a ceremonial grade matcha, it’s clear that Jade Leaf has carefully sourced and processed the tea leaves. The flavor is balanced and complex, with grassy, vegetal notes followed by a subtle sweetness. It has the perfect level of umami, which is an essential characteristic of a high-quality matcha. I’ve tried a variety of brands, but this one stands out for its consistency and superior taste.
The packaging is also noteworthy. The resealable bag ensures the matcha stays fresh, which is crucial for preserving its delicate flavor and antioxidants. It’s easy to scoop out the right amount without making a mess, and the instructions on the back are clear and helpful for those new to preparing matcha.
Whether you’re a seasoned matcha drinker or new to the world of green tea, this Jade Leaf matcha provides a top-notch experience. I highly recommend it for anyone looking for an authentic, high-quality matcha that delivers excellent taste and a sense of calm and clarity with every sip.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 12, 2026