Welcome to the forum I have a 2007 50 hp mercury bought brand new always been rough to start just thought it was cold starting engine starter was giving me problems after the fourth time bought a new one and starts on the first try now I use my boat a lot that starter has been cranked no telling how many times so I seem to think it was the starter the whole time got a buddy with the same motor and his boat sounds the same way mine did so it could have been a bad started all this time it cost $ 250 might be worth a shot very easy to change can do it in less than 10 minutes hope this helps
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