Both Motors on our 1/2 Cabin boat have 2 clamps each and are also bolted to the boat.
Am very reluctant to bolt a small outboard (4 to 6HP) to my 2.7m SIB (wood floor) but just use the clamps. Will not be travelling long distances, so to me vibration should not loosen the clamps.
There'll will almost certainly be a hole in the bracket right next to one of the clamp screws. Put a short rope through that and tie it down to an eyelet on the inside of the transom.
If there isn't an eyelet I'd fit one.
Will not be travelling long distances, so to me vibration should not loosen the clamps.
What do you do?
Check clamps after launching - often they need a turn extra. Always tie the bracket down to the transom plate - they mostly have a loop to lash to. I know a bloke who lost his 2.5hp...