Upper Casing Gasket for Yamaha 20 HP & 25 HP 2-Stroke Outboards

Premium-quality aftermarket upper casing gasket for selected Yamaha 20 HP and 25 HP 2-stroke twin-cylinder outboard engines.

Suitable for 20D and 25N Autolube models using Yamaha gasket part number 6L2-45113-A2 or the corresponding superseded part number.

Manufactured to OEM specifications for accurate fitment and reliable sealing.

Fits Yamaha Outboards

20 HP – 2 Stroke

20D
Twin-cylinder
Autolube models only

25 HP – 2 Stroke

25N
Twin-cylinder
Autolube models only

Engine Family

6L2

Replaces Yamaha Part Numbers

6L2-45113-A1
6L2-45113-A2
6L245113A1
6L245113A2

OEM part numbers are used for identification and reference purposes only.

Product Features

Upper casing gasket
For selected Yamaha outboards
20 HP & 25 HP
2-stroke applications
Twin-cylinder engines
Fits 20D / 25N
Autolube models only
6L2 engine family
Marine-grade quality aftermarket part
Manufactured to OEM specifications
Direct replacement for the corresponding Yamaha gasket
New replacement part

⚠️ Important – Autolube Models Only

This gasket is specifically listed for selected Yamaha:

20D / 25N – 2 Stroke – Twin Cylinder – Autolube

Please do not assume that it will fit every Yamaha 20 HP or 25 HP 2-stroke engine.

Yamaha produced different versions of these engines, and the upper casing gasket can vary between models.

Important – Please Check Compatibility

Before purchasing, please check:

Engine horsepower
Exact engine model – 20D or 25N
2-stroke engine
Twin-cylinder configuration
Autolube model
Existing gasket
Original Yamaha part number

For the safest identification, your original gasket should correspond with:

6L2-45113-A1 / 6L2-45113-A2

If the gasket looks the same as yours, this does not always mean it is the correct one for your outboard.

If you are unsure, please send us your engine model and serial number before ordering and our technical team will be happy to check compatibility.

Why Buy From SSI Marine?

Marine-grade aftermarket & OEM-spec 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

Yamaha Outboard 20 HP 25 HP 2 Stroke 20D 25N Upper Casing Gasket 6L2-45113-A2