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  1. S

    Converting Mercury 4 stroke 30hp to 40hp

    Hi Faztbullet I am interested in 30hp to 40hp upgrade on my Mercury four stroke EFI. You mentioned the "isolator" where is that located on the engine? Regards Scotty
  2. S

    30hp efi four stroke to 40hp upgrade

    Hi, I am running a Mercury 2003 30hp efi four stroke 3 cylinder engine on a wee 15ft boat. I was wondering if anyone knows how I can go about increasing the output to 40hp? I believe the displacement is the same SN, 219733 made in Belgium. Thanks for looking Scotty
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