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11A-A22J766 mower. Engine is a Chinese Honda clone 140cc. I cleaned carb w/ USC = no joy. New carb installed = no joy. Valve lash good at .005 Int & Exh. I can only get a 3 second run - seems moderately strong. Sounds like fuel delivery, eh? Fuel line flows adequately out of tank. Governor Spring seems new & not stretched. Compression is only 60 PSI - is that enough? Thanks, Doug

60 PSI is good for and engine with a cam compression relief built in.

This favors a lack of fuel supply from the tank.

Thanks, Auto Doc's. I'll chase fuel delivery.

Look for one of these shoved in the fuel tank line nipple or down inside the fuel line. Most people have no idea this is the fuel filter used on many small mowers:


I remove this hidden "pencil" filter and install an inline filter that can be serviced.

Good tip. Will look this pm.