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Mercury 225hp, 6 cylinder, 2stroke, power issues

Gogocam1999

New member
Hey I have this Mercury from late 1900s

It's a 6 cylinder 2 stroke with 225hp

I'm having kind of some weird issues with it.
1. When running it's running rough and shaking a bit (not much)
2. when trying to get the boat up in speed it looses power at 2000rpm and has a hard time getting the boat up going fast. But once the boat is up and riding the water it has no problems.
3. when going fast all of a sudden it reps up and then it dies completely. (Yes I can start the engine right after again)

Does anyone have any ideas what this can be? I just gave it 6 new spark plugs.
 
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