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Message: <blockquote data-quote="Stumpalump" data-source="post: 452815" data-attributes="member: 13140"><p>Make sure your tach is set for a twin cylinder and not 3. The 17" would be right if you are running in the low 30's if not put the 15 on. Sounds to me like weight may be the problem. My 48hp (basically the same motor as you have) is a on super light rig and can turn a 17" to 33 mph and a 19" to 34 on a cold day when solo. Add summer heat wife and dog and its 30 mph at 5400. That's with the 19. I need an 18 to be perfect. You can also scream that motor to 6500. On a heavy boat I'd prop it to pull over 6000 on a cold day and at least 5500 in the summer. They make gobs of power at high rpm and can run forever. Weight, weight distribution and trim setting is how you get good numbers. It takes practice but most on here can make a 25 mph boat run 28-29. Most can also add fat chicks, batteries, trolling motors, casting decks, bait wells and China bass bling and make a 28 mph boat run 21 just as easy.</p></blockquote><p></p>