PRODUCT DETAILS
CDI Unit / Ignition Module for Mariner Outboards
High-quality marine-grade aftermarket CDI ignition unit for selected Yamaha-built Mariner 9.9 HP, 15 HP, 20 HP and 25 HP 2-stroke outboard engines.
Designed as a replacement for Mercury / Mariner references including:
43077M / 43077T / 430775 / 430775M
This CDI family also cross-references to Yamaha 695-85540 ignition modules used on the corresponding Yamaha-derived engine platform.
Fits Selected Mariner 2-Stroke Outboards
9.9 HP
Selected:
Mariner 9.9C
15 HP
Selected models including:
- Mariner 15C
- Mariner 15K
- Mariner W15
20 HP
Selected:
Mariner 20C
25 HP
Selected:
Mariner 25C
Fitment Summary
| HP | Selected Mariner Models | Engine |
|---|---|---|
| 9.9 HP | 9.9C | 2 Stroke |
| 15 HP | 15C / 15K / W15 | 2 Stroke |
| 20 HP | 20C | 2 Stroke |
| 25 HP | 25C | 2 Stroke |
⚠️ IMPORTANT
These are selected Yamaha-derived Mariner outboards.
This CDI should not be assumed to fit every Mercury or Mariner 9.9 HP, 15 HP, 20 HP or 25 HP engine.
Replaces Mercury / Mariner Part Numbers
- 430775
- 430775M
- 43077M
- 43077T
- 96450M
Yamaha Cross Reference
This CDI family cross-references to selected Yamaha ignition units including:
- 695-85540-10
- 695-85540-10-00
- 695-85540-11
- 695-85540-11-00
- 695-85540-12
- 695-85540-12-00
Also associated with:
TIA01-36A
These Yamaha references are particularly useful when identifying the Yamaha-built Mariner engine family.
Additional Aftermarket Cross References
- Sierra 18-5131
- CDI Electronics 117-695-11
- CDI Electronics 17-69511
- Recmar REC695-85540-11
Yamaha-Built Mariner Engines
This is particularly important when selecting this CDI.
During this period, selected Mariner small outboards were based on Yamaha engine designs and therefore use Yamaha-family ignition components.
The CDI may therefore carry or cross-reference to a Yamaha 695-85540 number even though it is fitted to a Mariner outboard.
Do NOT order by horsepower alone.
Other Mercury / Mariner engines with the same horsepower can use completely different ignition systems.
Product Features
- Marine-grade aftermarket CDI ignition unit
- Suitable for selected Yamaha-built Mariner outboards
- Selected 9.9 HP applications
- Selected 15 HP applications
- Selected 20 HP applications
- Selected 25 HP applications
- 2-stroke applications
- Replacement for 43077M
- Replacement for 43077T
- Replacement for 430775
- Replacement for 430775M
- Cross-references to Yamaha 695-85540 family
- Direct replacement for compatible applications
- New aftermarket ignition component
What Is the CDI Unit?
The CDI – Capacitor Discharge Ignition – unit is an important component of the outboard's ignition system.
It stores and releases electrical energy to control the spark delivered to the ignition system.
A faulty CDI unit can be associated with symptoms such as:
- No spark
- Weak or intermittent spark
- Difficult starting
- Misfiring
- Engine cutting out
- Loss of ignition when hot
- Irregular engine operation
Important
These symptoms do not automatically mean that the CDI is faulty.
Similar problems can be caused by the stator, trigger/pulser components, ignition coils, stop circuit, wiring or poor electrical connections.
Proper diagnosis is recommended before replacing the CDI unit.
⚠️ IMPORTANT – Check Before Ordering
Do NOT order this CDI simply because your engine is:
- 9.9 HP
- 15 HP
- 20 HP
- 25 HP
The same horsepower can have several completely different engine and ignition-system designs.
Before purchasing, please check:
- Mariner engine model
- Horsepower
- 2-stroke engine
- Engine serial number
- Original CDI part number
- Wiring configuration
- Electrical connectors
- Mounting arrangement
Ideally, match your original CDI to one of these references:
430775
430775M
43077M
43077T
96450M
or the corresponding Yamaha:
695-85540-10 / 11 / 12
⚠️ Appearance Does Not Confirm Fitment
If the CDI unit looks the same as the one fitted to your engine, this does not always mean it is the correct part for your outboard.
Different CDI units can look very similar externally but have different internal specifications and wiring.
Please check the original part number and engine details before ordering.
If you are unsure, contact SSI Marine and we will be happy to help.
Before Replacing Your CDI Unit
If your engine has an ignition problem, we recommend checking the complete ignition system before installing a replacement CDI.
Check:
- Stator / source coil output
- Trigger / pulser coil
- Ignition coils
- Spark plugs
- Spark plug caps and leads
- Stop / kill circuit
- Engine earth / ground connections
- CDI wiring
- Electrical connectors
- Burnt or corroded terminals
- Damaged wiring
A fault elsewhere in the ignition system can produce symptoms similar to a failed CDI unit.
Aftermarket Replacement Part
This is a high-quality marine-grade aftermarket replacement part.
It is not a genuine Mercury, Mariner or Yamaha component.
OEM manufacturer names and part numbers are provided for identification and compatibility reference only.
The component is designed as a replacement for compatible Mariner applications using the part numbers listed above.
Buyer Responsibility
It is the buyer's responsibility to confirm compatibility before purchasing.
Please check:
- Engine manufacturer
- Horsepower
- Exact engine model
- 2-stroke engine type
- Engine serial number
- Original CDI part number
- Electrical connections
If you are unsure, contact SSI Marine before ordering. Our technical team will be happy to help identify the correct CDI unit.
Why Buy From SSI Marine?
- Marine-grade aftermarket & OEM-spec parts
- Workshop-tested products
- More than 10 years supplying and working with outboard engines
- Same-day dispatch before 1 PM Monday–Friday
- Royal Mail Tracked 24
- UK stock
- Collection available from Leigh, Greater Manchester
- Technical support from experienced outboard specialists
- Workshop open Monday–Friday, 9 AM–5 PM
SHIPPING & DELIVERY
Delivery & Returns Policy
Delivery
Standard Delivery
- £6: Royal Mail Tracked 24 Service
- £3.99: Large Letter - Royal Mail 1st Class Post (Untracked)
We offer free delivery on all orders over £150 (excludes outboard engines).
Orders placed before 1:00 PM (Monday-Friday) are usually dispatched the same working day.
Most parcels are delivered within 24 hours, but please allow extra time for courier delays that may occur outside our control.
For outboard engines, please contact us for a delivery quote.
Important: Please ensure your shipping address is correct before completing checkout. SSI Marine is not responsible for parcels sent to an incorrect address provided by the buyer.
Tracking Your Order
Once your order has been dispatched, you will receive a tracking number via email (after 5 PM on the day of dispatch).
Tracking is available only for parcels sent via Royal Mail Tracked 24.
Large Letter orders are sent via Royal Mail 1st Class Post (untracked).
Returns
We accept returns of unused and undamaged items within 30 days of purchase.
Returned items must be in sellable condition and include the original packaging.
Please do not tape, label, or write directly on the product's original box.
Important: Do not return items in their original product boxes only, they must be placed inside a protective outer box or bag. Parcels returned like the example below will be subject to a 20% restocking fee.
Return shipping costs are the customer's responsibility.
Please include your order details and reason for return inside the parcel.
Refunds
Refunds are issued for the item purchase price only (shipping costs are non-refundable).
All refunds will be made using the same payment method as your original order.
Items returned in poor condition or without proper packaging may incur a 20% restocking fee.
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