Engine struggles above idle speed

Are you meaning condensation because the fuel is low and the mower has been standing for 6 months?
Yep condensation. If there is ethanol in the fuel it will make it 10x worse. You would be surprised how much will collect in the fuel tank.
 
After fresh fuel and 30 minutes of occasional spluttering out of remaining water via white exhaust smoke; I completed 3 hours of full power mowing.

There was nowhere to take the mower and get it fixed. Coronvirus has closed everything down. I could not have done this with out the assistance of those on this site. Thank you again.
 
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