Vibration

[madmax]

i have a 23 ft 1980 septer. i had the same vibration with a seadrive 225. i just replaced the motor and had a armstrong bracket put on, i have not used it enough to see if i have the same vibration. my boat also list slightly to port.
i will pay attention next time i use the boat.
mad max

[barnacle]

I can not see the hull causing this kind of problem. If it is a outboard then this is the rpm range the idle and midrange jets start to fight one another. The engine does not know what jet to pull from thus causes a shake. This is just the nature of the carb 2 stroke. Most people do not feel it. Some engines do it more than others.

[Jpilot]

I'm sure that is it. I just installed an Armstrong bracket and closed in the transom and really don't remember the vibes before. My friend also has the same carb motor and has the same vibration with a standard transom.