SR4 cavitation plate height

[M.Thornton]

Hi all you SR specialists,can you let me know the recommended cavitation plate height in relation to bottom of boat on a 4m Sea Rider,also is any engine offset required for a 50 Yam 2-stroke,cheers.

[SimonStDavids]

I have offset mine, from memory it is either 38mm or 55mm I would have to measure it to confirm. Although I have many haven't so I think you will get about a 50/50 split! With it offset I found it a bit less inclined to chine walk as easily

As per height, mine is about 1" above the keel at mid trim. I have moved it about a bit and I found higher was more stable but would cavitate a bit especially in frothy water, lower had more grip but was less stable. When I rig my new one I will go around these again and drill it so that the engine at its lowest setting is level with the cav plate. Not scientific and I am sure others have other settings!

[M.Thornton]

Cheers Simon

[Nightfisher]

To be sure, look up the spec from both your boat and engine manufacturer. Mine's between 1/2-3/4 " below the bottom-flush transom centre. Should be easy to find and it's not a service manual your looking for just the set-up owners manual and they are free as a rule.