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550 case vibration

push2shove

New Member
Joined
May 29, 2017
Messages
2
Location
Washington state
Anyone familiar with a 550 case, I believe its a 91.
I starts great, Idles smooth but vibrate when you rev it. it rattles the screens on the Rop. Its not real bad but Ive ran other 550's that rev smooth, so I'm looking for the problem. I looked at the drive shaft and seems to rotate free.
Is something loose or bent maybe. Looking for suggestions to check from anyone. I'm more of an operator then mech.
 
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