# 688-85540-12 Yamaha CDI Unit | Genuine Used Part

🔧 Product Description

  

Genuine Yamaha CDI Unit - Part Number: 688-85540-12

  

A genuine Yamaha CDI ignition unit from the 688 two-stroke ignition family. This CDI is used on compatible Yamaha 75HP, 80HP, 85HP and related 3-cylinder two-stroke outboards requiring the 688-85540-12 control unit configuration.

  

⚙️ Key Features

  

• Genuine Yamaha CDI ignition unit

• Correct Yamaha part number 688-85540-12

• Part of the 688-85540 CDI family used on Yamaha 75HP to 90HP two-stroke applications

• Related replacement-family references include 688-85540-13, 688-85540-14, 688-85540-15 and 688-85540-16

• Must be matched by exact model code, ignition configuration and connector layout

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 688-85540-16 related later CDI family reference

• 688-85540-15 related CDI family reference

• 688-85540-14 related CDI family reference

• 688-85540-13 related CDI family reference

• 688-85540-12 earlier / supplied CDI reference

  

OEM / Related Numbers:

  

• 688-85540-12

• 6888554012

• 688-85540-12-00

• 688-85540-13-00

• 688-85540-14-00

• 688-85540-15-00

• 688-85540-16-00

• Related aftermarket ignition pack reference: CDI Electronics 117-6301

  

Aftermarket / Verified Equivalents:

  

• CDI Electronics: 117-6301

• Aftermarket replacement family: 688-85540-12-00 / 688-85540-13-00 style CDI

  

🚤 Compatibility

  

Commonly used on:

  

• Yamaha 75HP, 80HP and 85HP two-stroke CDI ignition systems using the 688 electrical family

  

Typically suits:

  

• Engine models:

• Yamaha 75A 1990-1996 two-stroke applications using the 688 CDI family

• Yamaha C75TLR 1994-1996 applications using the 688 CDI family

• Yamaha E75MLH 1995-1996 applications using the 688 CDI family

• Yamaha 80A 1988-1991 applications using the 688 CDI family

• Yamaha 85A 1990-1996 applications using the 688 CDI family

• Yamaha C85TLR 1991-1996 applications using the 688 CDI family

• Yamaha CV85ETL 1989-1990 applications using the 688 CDI family

• Yamaha 90 ETL / 90 XL 1984-1987 applications using related 688 CDI-family replacement listings

  

• HP Range: commonly 75HP - 90HP depending on exact model and CDI family reference

• Engine Type: Yamaha three-cylinder two-stroke outboard CDI ignition

• Year Range: approximately 1984 - 1996 for the listed 688 CDI-family applications

• Fitment Note: connector count, charge-coil system and model code must match the removed CDI

  

🔌 Function

  

The CDI stores and releases ignition energy based on pulser-coil and charge-coil inputs, controlling spark timing and coil firing for the two-stroke ignition system.

  

Common signs of failure:

  

• No spark on one or more cylinders

• Intermittent ignition failure when warm

• Hard start or no-start condition

• Misfire, hesitation or poor acceleration

• Loss of ignition timing control after stator and pulser checks

• No tachometer signal where the CDI provides the pulse

• Damaged CDI case, connector pins or wiring

  

📦 Condition

  

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated

## Details

- **Price:** 350.0 AUD
- **Vendor:** Sawley's Auto and Marine
- **Tags:** Sawley’s AAM Used Parts – Electronic Components | ECU CDI & Electrical Parts

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 350.00 AUD | In stock |

## Images

- 688-85540-12 Yamaha CDI Unit | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/688-85540-12-yamaha-cdi-unit-genuine-used-part)
> Updated: 2026-06-29