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CDI Unit for Yamaha 40HP 2-Stroke Outboard | 6F6-85540-00
CDI Unit for Yamaha 40HP 2-Stroke Outboard | 6F6-85540-00
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Product Overview
Replacement 12-pin CDI ignition unit for selected Yamaha 40HP 2-stroke outboard engines, including compatible E40, 40MH, E40M, E40W, 40WH, and 40W applications.
Designed to replace Yamaha OEM 6F6-85540-00, this CDI features an 8+4 male plug configuration and measures approximately 71 × 63 × 26mm.
Before ordering, verify the OEM number, complete outboard model code, 12-pin connector configuration, dimensions, mounting points, and original CDI appearance.
Product Compatibility
| Make | Model / Series | Engine | Engine Type | OEM Reference |
|---|---|---|---|---|
| Yamaha | E40 | 40HP | 2-Stroke Outboard | 6F6-85540-00 |
| Yamaha | 40MH | 40HP | 2-Stroke Outboard | 6F6-85540-00 |
| Yamaha | E40M | 40HP | 2-Stroke Outboard | 6F6-85540-00 |
| Yamaha | E40W | 40HP | 2-Stroke Outboard | 6F6-85540-00 |
| Yamaha | 40WH | 40HP | 2-Stroke Outboard | 6F6-85540-00 |
| Yamaha | 40W | 40HP | 2-Stroke Outboard | 6F6-85540-00 |
Fitment Note: Yamaha used different ignition components across 40HP outboard families and production years. Match OEM 6F6-85540-00 and the original CDI configuration rather than relying on horsepower alone.
OEM Cross-Reference Numbers
Yamaha
- 6F6-85540-00
- 6F6-85540-00-00
The extended 6F6-85540-00-00 format may appear in Yamaha dealer or parts-catalog listings for the same base part reference.
Specifications
| Specification | Details |
|---|---|
| Product Type | CDI Unit / Ignition Module |
| OEM Reference | 6F6-85540-00 |
| Engine Type | 2-Stroke Outboard |
| Horsepower | 40HP |
| Connector | 12-Pin Male |
| Connector Configuration | 8+4 Pin |
| Length | 71 mm / 2.80 in |
| Width | 63 mm / 2.48 in |
| Height | 26 mm / 1.02 in |
| Mounting Hole Distance | 86 mm / 3.39 in |
| Housing Material | ABS |
| Application | Yamaha Outboard Motor |
| Condition | New |
| Package Quantity | 1 CDI Unit |
Key Features
- 12-Pin CDI Configuration: Features an 8+4 male connector arrangement for compatible Yamaha ignition systems.
- OEM-Specific Replacement: Designed to replace Yamaha 6F6-85540-00.
- 40HP 2-Stroke Application: Suitable for selected E40, 40MH, E40M, E40W, 40WH, and 40W outboard models.
- Compact Housing: Approximately 71 × 63 × 26mm for comparison with the original module.
- Fitment Reference: 86mm mounting-hole spacing provides an additional physical reference before installation.
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Fitment FAQ
Will this part fit my specific model and year?
This CDI is designed for selected Yamaha 40HP 2-stroke E40, 40MH, E40M, E40W, 40WH, and 40W outboard applications associated with OEM 6F6-85540-00.
Because the original listing does not specify a complete year range, confirm your engine model code and original CDI rather than relying on horsepower alone.
Do I need to match the OEM part number?
Yes. Matching the OEM number is strongly recommended.
Primary references:
6F6-85540-00 / 6F6-85540-00-00
If your original CDI carries a different OEM number, verify interchangeability before ordering.
What models or situations does this part not fit?
Do not assume this CDI fits:
Every Yamaha 40HP outboard
Yamaha 40HP 4-stroke engines
Outboards using a different CDI OEM number
CDI units using a different connector configuration
Applications without the matching 8+4 pin arrangement
Modules with different mounting dimensions or wiring
Similar horsepower does not guarantee ignition-system compatibility.
What should I check before ordering?
Confirm:
Yamaha outboard model
Complete model code
40HP 2-stroke engine
OEM 6F6-85540-00
12-pin / 8+4 male plug
Connector shape and pin arrangement
Approx. 71 × 63 × 26mm module dimensions
Approx. 86mm mounting-hole distance
Original CDI appearance