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  1. J

    25HP Mercury 4 stroke efi

    OK got a 2006 25HP Mercury 4 stroke EFI just purchased on a 16ft tracker. Owner said it ran about 21mph, took it out today only runs about 7mph @ 4500 RPM. He did change the prop before he sold it to me not sure what was on before. Right now it's a 9.75x9.5P. Do I have a prop problem? I...
  2. J

    Prop selection help to get max rpm

    I have a 1748 Tracker Grizzly with a 25hp 4 stroke Mercury Bigfoot engine. Now I'm aware of the gear ratio in the motor and it's original purpose to push bigger boats/heavier loads rather than what I have. That being said, I have tested the prop on it now which is the factory 10.88X11. The...
  3. J

    Help with prop selection

    Hi, I've got a 1994 17.5 foot Century fish and ski. It has a 94 Yamaha 115tlrs on it with a 13X17 prop. My problem is at WOT I'm only at about 4300 RPM and according to GPS about 43 MPH and I should be at 5500RPM at WOT, now I don't think this is the original prop for the boat and the engine...
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