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  • Magneto Flywheel

    I just measured the runout on my seadoo 97 xp 800 magneto flywheel, using a dial indicator and stand, the outside and inside of the flywheel had .4mm. and the two little trigger lumps only had .1mm difference.

    I measured this with the magneto flywheel bolted to the starter flywheel, and that bolted on the crank. I know the crank is straight its just been rebuilt and I put the dial indicator on the nose of the crank and the needle didnt even move.

    Would this .4mm cause vibrations or anything bad to happen?? Just incase I'm not explaining myself properly, I mean it has .4mm up and down, like towards the sky and down to the ground, NOT out the front (like front and back), .4mm out in the same direction as the pistons travel.

    Maybe I should get both flywheels balanced together??

    What do you think team? [img]/graemlins/cwm27.gif[/img]

  • #2
    By all means, get it balanced if you plan on turning higher than normal rpm. Your crankshaft bearings will love you for it.

    The flywheel is pretty much normal, and probably within spec for a stock motor. If you really want to see some gyrating, check out a 580-720 wheel at about 7K rpm. You will run for cover ! They wobble so bad, I'm surprized the crankshafts last a season.
    Bill O'Neal WCM
    <a href="http://www.watercraftmagic.com" target="_blank">www.watercraftmagic.com</a>

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