Strange noise on my 2003 mercury 60/40 jet

by Keith
(Chambersburg PA USA)

I never had a boat with a jet motor before. So today I went for my first run. Boy was it fun!when at full throttle she was nice and quiet. Then when I'm just in neutral, at idle, I hear like a rattle or something coming from what I think is in the shafts area between motor and jet. Not loud, just worrysome. Soon as I power it up, it's gone. Should I bee concerned? What could it be? Do jets make little more noise or should I make an appointment?

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