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I am the new owner of a 1978 20' outrage fitted with a 1995 150 Yamaha saltwater series that has about 500 hours on it. It runs smoothly throughout the current rpm range. I believe the prop is original to the 1995 motor installation. However at wot it only reaches about 4000 rpms @ 32mph. The motor is rated at 4500-5500 at wot. I was told the prop may be to big. I believe the current prop has a 19 pitch. Any insight or suggestions would be helpful. Thanks