I bought a used mower primarily for the transmission and deck, but it does have an engine that starts and runs. Unfortunately it randomly sputters and loses power for 3-5 seconds. As it heats up it becomes more frequent and actually died a couple of times when I tried to mow a section of the lawn. Someone suggested it might be a fuel flow issue so I replaced the fuel line, pump, vacuum line and even swapped the carb for one taken off an engine with a thrown rod. Still does the same thing.
Any suggestions on where to start next? One odd thing I noticed after running it this last time was that there was a sound like water boiling coming from the front of the engine immediately after shutting it off. I thought it was the carb float bowl but I can’t be sure it wasn’t coming from the valve cover. The engine is a B&S 20hp V-twin OHV from around 2005 or so.
Any suggestions on where to start next? One odd thing I noticed after running it this last time was that there was a sound like water boiling coming from the front of the engine immediately after shutting it off. I thought it was the carb float bowl but I can’t be sure it wasn’t coming from the valve cover. The engine is a B&S 20hp V-twin OHV from around 2005 or so.