I've got a GX160 driving a Davey Firefighter pump. It starts readily and runs fine but then starts misfiring and stops. Sometimes 30 secs, sometimes 5 minutes. Not good for fighting fires. I have had the carby apart and didn't find any blockage or sediment in the float bowl or sediment bowl. Jet and tube are clear and all holes blow through with cleaner.
What I did notice is that the sediment bowl has a very fine filter which is additional to and downstream of the filter in the tank pickup. However, this filter is not present on some web-sourced descriptions of the carby. Is it possible that the fineness of the filter is causing some problem for the flow of fuel, eg viscosity in cold weather, varnishing-out of fuel products? If so, could I not just remove it?
