In my experience, there are always weight restrictions on Indonesian airlines but application of them seems haphazard. This past summer, leaving Bali for Manado, and later for Bima, we were hit with charges, but returning from Manado, none, not even a question. If your boat arranges the flight or checks you in, they have probably negotiated something. Even if that's not the case, you can negotiate the overage charges. On our way to Manado, I showed my empty wallet and protested I just didn't have the necessary cash. Eventually, I was charged for just a couple of kilos overage rather than the actual weight of all our bags. Incidentally, when you're checking in, if you have oversized or heavy carry-ons, i.e., camera gear. Just keep them away from the sight of the desk agents and security guards by leaving them with another member of your party. None of this is true with Cathay, JAL or any of the international carriers who can be quite strict about both checked and carry-on limits.