PRODUCT DETAILS
STD Piston Kit for Yamaha 4 HP 2-Stroke Outboards
Premium-quality aftermarket standard-size piston kit for selected Yamaha 4 HP 2-stroke 6E0 outboard engines.
Suitable for Yamaha 4A, 4AS, 4AC and 4ACMH models using the corresponding standard-size piston.
This kit can also be used on the equivalent Yamaha-manufactured Japanese Mariner 4 HP engines with 6E0 identification.
Kit Contains
- 1 x STD Piston
- Piston Rings
- Piston Pin
- Circlips / Piston Clips
STD = Standard Size
Fits Yamaha Outboards
4 HP – 2 Stroke – 6E0
Fits selected:
- 4A
- 4AS
- 4AC
- 4ACMH
- 6E0 models
Also Fits Selected Mariner Outboards
Can also fit the equivalent Japanese Mariner 4 HP 2-stroke engines manufactured by Yamaha, identified by the 6E0 prefix.
It will NOT fit Mercury-manufactured Mercury / Mariner 4 HP engines.
Replaces Yamaha Part Number
- 6E0-11631-00-98K
- 6E0-11631-00-98
- 6E0116310098K
- 6E0116310098
OEM part numbers are used for identification and reference purposes only.
Product Features
- Complete piston kit
- STD / Standard size
- Yamaha 4 HP application
- 2-stroke engine
- For selected 6E0 models
- Fits 4A / 4AS / 4AC / 4ACMH
- Piston included
- Piston rings included
- Piston pin included
- Circlips included
- Premium-quality aftermarket replacement
- Manufactured to OEM specifications
- New replacement part
⚠️ Important – STD Piston
This is a STANDARD SIZE (STD) piston kit.
Before ordering, please make sure your engine still requires a standard-size piston and has not previously been rebored for an oversize piston.
Important – Please Check Your Engine
Please do not order by 4 HP alone.
This kit is intended for the Yamaha 6E0 engine family.
Before purchasing, please check:
- Engine model
- 6E0 identification
- Original piston part number
- Cylinder condition and bore size
- Required piston size – STD
For Mariner applications, please make sure your engine is the Japanese Yamaha-manufactured 6E0 version.
If you are unsure, please send us a photograph of your engine identification plate before ordering.
Why Buy From SSI Marine?
- Premium aftermarket & OEM-spec marine parts
- Workshop-tested products
- More than 10 years supplying outboard parts
- UK stock
- Same working day dispatch before 1 PM Monday–Friday
- Royal Mail Tracked 24
- Technical support from experienced outboard specialists
- Collection available from Leigh, Greater Manchester
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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