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Motor Buckin'




My motor is bucking a bit when I open the throttle up. basically when I am moving forward at a minimal clip, it works perfectly. When I open the motor up, it feels and sounds like it is 'down shifting'. After decelerating and accelerating a couple of times we were able to get the motor humming at full speed. I have replaced the spark plugs, fuel lines and connectors to the fuel line.

I was thinking that it was the spark plug but its not, we are getting good firing. Do you have any other ideas on what else could be causing this.

The gas is new, with the correct amount of seafoam. We have gone through about 3 gallons puttering around.

this is a 40hp Mariner.


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I think they are easy to do I have done a few on mercurys and it's a simple diaphragm pump.

Carbs are really not that bad either they are a bit intimidating at first but they are really not that tough.

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Personally I think carbs are the easiest thing to rebuild, they're really simple when you break them down and see how few parts there are. If your feeling a little apprehensive about doing the work yourself its better to just bring it to a shop and have them do it. Better to spend the coin on getting them done the right.

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