What is the desirable compression ratio for a 1993-94 90HP Yamaha outboard? Ours checked out the same in all three cylinders 130 psi. Since all three cylinders checked outthe same, I am assuming that is a good sign, but I don't really know what it is supposed to be.
We just got our 1988 Dynasty ski boat back from the shop. It has a 4.3 v6 Mercruiser. They replaced the lower unit only and now the boat doesn't seem to have nearly as much towing power as it did before. Does anyone know what the possible gear ratios are? Could they have replaced the lower unit...
