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CDI Unit for Yamaha 9.9HP 15HP 2-Stroke Outboard | 6B4-85540-00
CDI Unit for Yamaha 9.9HP 15HP 2-Stroke Outboard | 6B4-85540-00
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Product Overview
Replacement 8-wire CDI ignition unit for compatible Yamaha 9.9HP and 15HP 2-stroke outboard engines.
Designed to replace Yamaha OEM 6B4-85540-00, this CDI module is intended for compatible marine ignition systems using the same wiring, connector configuration, mounting dimensions, and original CDI design.
The unit measures approximately 77 × 59 × 21mm with an approximately 77mm mounting-hole distance.
Before ordering, verify the OEM number, engine model, 8-wire configuration, connectors, mounting dimensions, and original CDI appearance.
Product Compatibility
| Make | Engine | Engine Type | Fitment Notes | OEM Reference |
|---|---|---|---|---|
| Yamaha | 9.9HP | 2-Stroke Outboard | Selected compatible models | 6B4-85540-00 |
| Yamaha | 15HP | 2-Stroke Outboard | Selected compatible models | 6B4-85540-00 |
Important: This CDI should not be selected by horsepower alone. Yamaha used different ignition modules across 9.9HP and 15HP outboard engine families.
Match OEM 6B4-85540-00 and compare the original CDI before ordering.
OEM Cross-Reference Numbers
Yamaha
- 6B4-85540-00
- 6B4-85540-00-00
The extended -00-00 format may appear in Yamaha parts catalogs or dealer listings for the same base part reference.
Specifications
| Specification | Details |
|---|---|
| Product Type | CDI Unit / Ignition Module |
| OEM Reference | 6B4-85540-00 |
| Engine Type | 2-Stroke Outboard |
| Listed Horsepower | 9.9HP / 15HP |
| Wiring | 8-Wire |
| Length | 77 mm / 3.03 in |
| Width | 59 mm / 2.32 in |
| Height | 21 mm / 0.83 in |
| Mounting Hole Diameter | 13 mm / 0.51 in |
| Mounting Hole Distance | 77 mm / 3.03 in |
| Housing Material | ABS |
| Application | Yamaha Outboard Motor |
| Condition | New |
| Package Quantity | 1 CDI Unit |
Key Features
- 8-Wire CDI Configuration: Designed for compatible Yamaha 2-stroke outboard ignition systems.
- OEM-Specific Replacement: Replaces Yamaha 6B4-85540-00.
- 9.9HP / 15HP Application: Intended for selected compatible Yamaha outboard engines.
- Marine Ignition Component: ABS housing provides protection for the internal electronic components.
- Fitment Reference Dimensions: 77 × 59 × 21mm housing and approximately 77mm mounting-hole spacing help confirm compatibility.
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Preguntas frecuentes sobre compatibilidad
¿Esta pieza es compatible con mi modelo y año específicos?
This CDI is intended for selected Yamaha 9.9HP and 15HP 2-stroke outboard engines using OEM 6B4-85540-00.
Because horsepower alone does not identify the ignition system, verify your complete engine model and original CDI before ordering.
¿Necesito que coincida el número de pieza OEM?
Yes. Matching the OEM number is strongly recommended.
Primary references:
6B4-85540-00 / 6B4-85540-00-00
The OEM number provides a much more reliable fitment reference than simply matching a 9.9HP or 15HP engine.
¿Qué modelos o situaciones no son compatibles con esta pieza?
Do not assume compatibility with:
Every Yamaha 9.9HP outboard
Every Yamaha 15HP outboard
4-stroke engines
CDI units using a different OEM number
7-wire CDI systems
Modules with different connectors
Applications with different mounting dimensions or wiring
In particular, this 8-wire 6B4-85540-00 CDI should not be confused with the 7-wire 63V-85540-00 CDI used on other Yamaha 9.9HP / 15HP 2-stroke applications.
¿Qué debo verificar antes de hacer un pedido?
Confirm:
Yamaha outboard engine model
Engine type
2-stroke configuration
OEM 6B4-85540-00
8-wire configuration
Connector shapes and terminal arrangement
Approx. 77 × 59 × 21mm module dimensions
Approx. 77mm mounting-hole distance
Original CDI appearance