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    Fuel question

    I have a Mercury 225 EFI which has experienced problems this summer resulting in pistons to score the cylinders. I have had the powerhead rebuilt and the rebuilder has told me to start burning high test fuel due to the ethanol. Can anyone confirm that this is necessary? And if I don't burn high...
  2. C

    Mercury 225 EFI slow out of the hole

    My Mercury 225EFI recently had a new power head installed. I have gone through the break-in period but the top RPM's are only 4500 and the boat is slow to come up on plane, especially when pulling a tube. Any ideas on my problem?:eek:
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    Mercury 225 EFI stalling problem

    Recently had a new powerhead installed. Proceeding through break-in period. Engine runs fine (3500-4500rpm) on lift at 30-45 min. duration but under load the engine stalls out after 10-15 minutes and continues to stall on the way back to the dock. Is this a fuel or electrical problem? Strong...
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