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Oliver 550 runs rough

Dave Smith Oliver 550 gas runs fine for 1 hour then it will run rough. I can pull the choke closed and it runs fine. I rebuilt the carburetor and preformed a valve job and replaced of the upper gaskets. I have not been able to find a vacuum leak. Any ideas?
Bob C My 550 did the exact same thing. I replaced the gas filter and it ran fine.


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