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    1988 mercury 9.9hp 2 stroke won’t get up to gig rpm

    Hi, I have a mercury 9.9hp 2stroke and will not get up to high rpm while in the water.. I can rev it up in neutral and it will rev high but when in forward gear seems to only get up to 2500rpm or so ( just a guess don’t have a tach). I’ve done a lot of work to it but nothing has fixed it, please...
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