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I have a 2009 Mercury 50 hp engine. It starts to shutter…

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I have a 2009 Mercury...
I have a 2009 Mercury 50 hp engine. It starts to shutter slightly (once every 30 seconds to 3 minutes) from 1200 RPM to 2000 RPM. It has done it since day one. But its worse when the engine is cold. It runs great above 2000 Rpm and at idol. I had the carbs rebuilt, new reed valves, new plugs, wires ect. However, I do have a 4 blade turbo prop. I do a lot of stop and start fishing going from spot to spot, each time I need to pump the ball up. Is that normal? In the old days my dads boat only required the ball pump once at the beginning of the trip. Do you have any ideas as to the engine shutter.
Submitted: 2 years ago.Category: Boat
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Answered in 1 minute by:
3/6/2016
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 18,158
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Verified

Hi John, my name is Jason.

Is the engine actually misfiring, or is it just a shutter?

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Marine Mechanic: Jason, Marine Mechanic replied 2 years ago

It looks like you read my reply and logged off, did you still need help with this?

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Customer reply replied 2 years ago
It does not shake or any thing it sputters for a second and then resumes. How can I tell a misfire other than a shutter
Customer reply replied 2 years ago
the boat slows and then resumes speed within a second or two
Customer reply replied 2 years ago
are you there
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago

Hello, sorry for the delay. We all do this on the side, out of our houses. When you first asked your question this morning I replied back 2 minutes after you asked it, I waited around for 1/2 an hour or so and didn't hear from you, so I went on with my day .

Does this issue happen at any other speed other than 1200 to 2000? If you idle around, or run it at close to full throttle, will it do the same thing?

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