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Old 24-07-2017, 17:42   #1
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Location: Portland maine
Boat: 1986 Catalina 27
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Mercury 40 hp bogging down

Hello. I have a 2001 Mercury 3 cyl four stroke outboard. It has recently been acting weird. Firstly, it revs up to almost 6000 in neutral, which means It cannot even be shifted into gear. However, if i start the engine and shift into gear fast enough, i can catch it at 1000 rpm before it revs up. when its in gear, it bogs down, and as soon as i touch the throttle it dies unless i pump the throttle back and forth. when i pump it back and forth the engine runs fine until i move the throttle at all. Once the throttle is touched the engine bogs down and dies. I replaced the fuel pump and throttle and gear control unit recently, which made no change. My thought is that the electronic choke on the 40 is stuck, because when I choke my yamaha 8 it throttles up a lot in neutral by itself, then when i put it into gear it has no power and it dies. I have no idea what to do next.
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Old 24-07-2017, 17:56   #2
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Re: Mercury 40 hp bogging down

Have you looked at the throttle linkage as it enters the carb?

Seems like you have stuck linkage or butterfly in the carb.

It is carborated right?
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Old 24-07-2017, 19:25   #3
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Re: Mercury 40 hp bogging down

Butterflies are all closed and operating normally
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