Merc Mark 55 40hp no power

MercMe

Seaman Apprentice
Joined
Aug 25, 2011
Messages
44
Hello all,
This is my first boat and I have some problems I need help with.
1st off. The first time I had the boat out this summer it was not firing on all cylinders I took it to a shop and they did a basic tune up and told me the last owner had the wrong plugs in. I took it back out and it seems to still be way under powered. I can barley do 5mph with a very light 14f fiberglass boat.

The second problem is that when I take the throttle down low enough to switch gears the motor stalls. Any ideas??? Thank you!
 

rivermouse

Senior Chief Petty Officer
Joined
Jun 16, 2011
Messages
661
Re: Merc Mark 55 40hp no power

I think the "basic"tune up was TOO BASIC,,,,,,,LOL Sounds like you have a fuel delivery issue to me. Find someone else to check it out..
 
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