hello a friend of mine repowered his phoenix with a 2025 mercury proxs 250 j\he has 13 hours on it but it doesn't matter what prop a 24 fury or a 25 fury wont go over 5800 rpms i told him check if mechanic set full throttle at 100 % that requires him to go back to shop where he purchased it any other thoughts on what to check thanks for your help