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After running at 4900 rpms for about 45 minutes I will lose 600-800 rpms. My throttle lever is still in the same position I had it at 4900 rpms and does not move when this happens. If I pull the throttle back a few inches and push it all the way forard again I'll get back up to 4900 rpms for a minute or so but the rpms will drop off again. I just change out the fuel filter and my oil tank has pleanty in it.
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