I think he may not have cleaned out that carb jets enough. for the record, I was the first recorded dealer telling everyone many years ago about the issues with corn syrup (ethanol) or corn crap clogging the jets in these small carbs. Best advice is to buy ethanol gas and let the engine run out of fuel every time. Many who do this report back no issues with engiens for years. Of course it could be other issues but the above advice given and to what I said should always be adhered to.