I just bought a boat, a 16 SportCraft center console, with a Suzuki DT-85 engine. The owner didn't use it much, in fact the paint is still on the original prop. The prop size is a 19 pitch and he claims it only does about 25 mph. This seems slow to me and possibly over propped. I'm thinking a 13"-17 pitch might work better. The boat has no tach, but I will be installing one. The thing is that I have a chance to pick up a 17 pitch at a good price. What are your thoughts ??