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How to get rid of vibration of the flex shaft?

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How to get rid of vibration of the flex shaft?

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Old 01-05-2019, 06:39 PM
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khkim0102
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Default How to get rid of vibration of the flex shaft?

Hi, Boaters

When I spin the prop by a hand to see if the flex shaft wobbles near the coupling, I do not see any wobble and the flex shaft, coupling, and motor are in the straight alignment.

However, around the half throttle, the flex shaft wobbles with vibration, and then, at the higher rpm, wobbling and vibration are much decreased.

What causes this? What will be the solution for wobbling and vibration at the mid-rpm? Advanced boaters' advice will be greatly appreciated. Here is a picture of the boat set up.
Thanks for your attention.
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Old 01-06-2019, 10:05 PM
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Hydro Junkie
 
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Is the prop balanced?
Is there play between the shaft in the strut or motor bushings?
Are the screws securing the strut, motor and motor mount all tight?
These three are usually where I would start looking
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