502 magnum mpi/bravo 1 vibration help !
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502 magnum mpi/bravo 1 vibration help !

  1. #1
    Member
    Join Date
    Oct 2009
    Posts
    32

    Default 502 magnum mpi/bravo 1 vibration help !

    ok i have a 502 magnum MPI with a bravo 1 drive.i have only owned the boat 1 year now.i have always elt a small vibration in running gear.So i automatically thought drive, i pulled the drive tonight checked gimbal bearing it turns perfect and smooth (plenty of grease) the u-joints also semm just fine.So i plumbed up the motor to run on hose with no drive and started the engine and i still have a what i call a vibration and i dont think its a mis or rough running it runs and idles smooth and will run up to 5,100 rpm so at this point not sure were to go now.I did a full service this spring oil,filters,plugs ect. thanks for your time jerry

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  3. #2
    Junior Member
    Join Date
    Mar 2013
    Posts
    8

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    Do you have threw transom exhaust wit internal flappers . I had the same vibration in till figured it out . I had just replaced my internal flappers and had a huge vibration . I was racking my brain in till I stuck my hand up the exhaust pipe and grabbed the flappers and the vibrations stopped

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