hi, I just bought a exel 18sx bowrider with a volvopenta 230 engine, took it out for the first time today and found that it doesnt really have enough power to get the boat going.it will get up to plane but it takes a few minutes to work its way up. I was wondering, is this just a poor engine choice or is there some way to get more out of it? is there a better choice of engine that will bolt in to my sterndrive/ mounts fairly easily? I was hoping to at least be able to pull the kids on a tube! haha. any advice would be great . thanks