Mark 55 under powered and other problems help please!

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. They cleaned the carbs and made sure there was in fact compression in all four cylinders and there is. :confused: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!
 
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