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2007 F250 has a knocking sound that's got me worried. Please see video.

In my opinion mate i would seek serious advice.Sounds same as the noise i had seen a few times, in the cases i have seen not to say it is the same.The yamaha 225 has valve seat problems and destroyed 1 cylinder. My opinion is dont run the motor and have it sorted if it is the same as the issue we have had(2 motors have done this to us)it will result in the valve parting with the stem and causing lots of damage.Sort it befor oyur bill goes in the thousands.Good luck with it i hope it isnt what i said.
 
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