Can't think of any, other than having to take the complete mount out to remove the motor, but that is not uncommon. Have you though of pulling the rails out and mounting the engine on bonded in posts?



By doing this you can shorten the posts as much as you need to enable the motor to go as low as you want. The picture is an old play boat of mine and the mounts are simple home made from 1/8" angle, chopped to suit as you see. The posts are aluminium with tapped holes 5mm and the rubbers are bought. I bond the posts in after glueing them to test fix into position with superglue, then bond in with a paste made from polyester resin and microfibres, then cover with a layer of matting or tape.

This lets you get the engine as low as you want to.

Hope it helps, very strong installation - and lighter than rails.

Glenn