Got a new (used) boat with a freshly rebuilt VRO 90hp V4. It runs beautifully but I have a problem with going into forward. It shifts forward great but I have to really put muscle into it to push the shaft forward. I know my wife wont be able to drive it like this. What can I do. My mechanic said to disconnect the cable and if it is still stiff, there is nothing I can do. Any suggestions?