Upper Casing / Lower Leg Access Cover for Yamaha & Mariner Outboards

Quality replacement upper casing / lower leg access cover for selected Yamaha and Yamaha-manufactured Mariner 4 HP and 5 HP outboard engines.

Commonly described as a lower leg access cover, access plug or access grommet, this part fits into the access opening in the outboard's upper casing / driveshaft housing.

Replaces Yamaha part number 647-45151-01 and corresponding Mariner reference 80533M.

Yamaha's parts catalogue officially describes 647-45151-01 as “COVER, UPPER CASING.”

Fits Yamaha Outboards

4 HP

Selected:

4A
4B
6E0 family
2 Stroke applications
Selected F4A 4 Stroke applications

5 HP

Selected:

5C
6E3 family
2 Stroke applications

Fits Yamaha-Made Mariner Outboards

Suitable for selected 4 HP and 5 HP Yamaha-manufactured Japanese Mariner outboards using the corresponding driveshaft housing access cover.

Important

Mariner fitment is for Yamaha-made Japanese models only.

It should not be assumed to fit Mercury-manufactured Mariner engines simply because the horsepower is the same.

Replaces Part Numbers

Yamaha

647-45151-01
647-45151-01-00
6474515101
647451510100

Mariner

80533M

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

Product Features

Upper casing access cover
Lower leg access cover
Driveshaft housing access cover
Also commonly searched as an access grommet / plug
Fits selected Yamaha outboards
Fits selected Yamaha-made Mariner outboards
4 HP
5 HP
Selected 2 Stroke
Selected 4 Stroke
6E0 / 6E3 applications
Marine-grade aftermarket replacement
Manufactured to OEM specifications
New replacement part
UK stock

Important – Cover or Grommet?

This part is often described or searched for as a lower leg access grommet.

However, Yamaha officially identifies 647-45151-01 as the COVER, UPPER CASING.

Please do not confuse it with the separate rubber grommet 90480-10M13 shown next to the cover in Yamaha parts diagrams.

Important – Please Check Compatibility

Please do not order by horsepower or appearance alone.

Before purchasing, please check:

Engine manufacturer
Exact engine model
Engine code
Engine serial number
2-stroke or 4-stroke
Existing cover
Original part number

For Mariner engines, please make sure yours is a Yamaha-manufactured Japanese Mariner model where applicable.

If the part 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 purchasing 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
Workshop open Monday–Friday, 9 AM–5 PM

Yamaha Mariner Outboard 4 HP 5 HP Upper Casing Access Cover 6E0 6E3 647-45151-01 80533M