CDI Unit for Yamaha 40HP 2-Stroke Outboard | 6F6-85540-00

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.