Transom ideas

[GregF]

When a motor goes in running the concern is that it stop before it ingests a cylinder of water. That will break pistons and rods. Those race boats may have kill switches.
I bet a new 4 stroke would fare better than a 2 stroke submerged (off) because the crank case is fairly well sealed on new motors. You still need to treat it very fast when it comes out. As soon as the air hits it, rust starts.
WD40 to the rescue!

[rancherlee]

sunk a few snowmobiles "water skipping" in the summer and also sunk a few ATV's mudding also. As soon as its out of the water you drain the water out, fill the entire crankcase with Diesel for bit, turn the engine over by hand a few revolutions then drain and fill with oil. Diesel does a great job of driving water out, getting in every nook and cranny, and acting like a lube. After an oil change or two she should be good to go.