ANTI CAVITATION QUESTION- How deep is too deep?!?

[geauxsaints337]

I have a 1980 Yamaha 25 HP Mariner tiller handle motor on a 14' 1985 Cajun Special. The boat is rated for 250 pounds (I am 230 pounds) and I'm just wondering if I am too heavy too sit in the back and steer it. How deep should my motor be in the water? I am afraid to cause damage to it if it is too deep. The picture posted is just to show the location of the motor in reference to the boat. Thanks in advance!

 

[racerone]

You should check the capacity rating on the boat.----No such thing as a 14' boat rated for only 250 LBS.--Cavitation plate should be about 1" below the boat.

 

[Sea Rider]

With engine well trimmed, sit a boater up front to ballance boat better. Check at wot if having over or back transom water splashes. Should start testing with current sitting, if none over or out water splashes engine sits at the sweet engine/trasom height. The AV plate stated height is only a refference, will depend on hull shape and other factors to have into account, proper engine height must be dialed under trial and error.

Happy Boating

 

[geauxsaints337]

No Title

You should check the capacity rating on the boat.----No such thing as a 14' boat rated for only 250 LBS.

I beg to differ...

 

[gm280]

The whole concept of mounting any OB engine for the best possible performance is to mount it high enough to eliminate drag as best you can while maintaining enough water into the water pump to properly cool the engine off. Too low and you hit things in shallower water, too high and you starve the water coming in and allow air to get into the prop causing cavitation. So it is a micro-meter game that is unique to each setup and equipment for that setup. Either just mount it on the transom and happy boating, or move it up a little until you start seeing issues with water inlet and/or prop cavitation.... JMHO!