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    experiance with spark plugs

    picked up a set of champion rv12ycy plugs for my 165 mercruiser,properly gapped them,installed them.started my boat and low and behold,,,,3 dead ones right off the bat.I got the champions because they were out of the ACs and NGKs,,so i exchanged the champs for ACs and she runs smooth..seems more...
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    need help with prop selection

    Hey Folks,i'm stuck on which prop for my boat, Its a 18 foot steury v518,it has a 165 i6 mercruiser.when i got the boat ,it had a 15x15p prop but its chunked pretty bad.I bought a 14x19p prop..boat seems to have good top end,but lags out of the hole.wot is about 3800rpm.the boat weighs about...
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