I heat a 100 foot x 38 foot greenhouse all winter now we still are picking tomatoes and peppers. Have a month down in January then Feb has to be 75 degrees until May. Last Feb I burned a 8 cord grapple load in two weeks. Sounds like a lot but greenhouses are just plastic and don't hold much heat. Also heating My farmhouse old and not well insulated plus a farmstand all winter. I use two John Deeres one 45 hp 2150 with a dump trailer and run the verticle log splitter on my 140 hp 4455. Anyway the 660 I changed the plug today dumped out the residual gas and she fired right up. Maybe very sensitive to choke compared to my other saws. It had rum half hour but sat about an hour so I pulled it twice with the choke like I would the 046 or 038 but maybe caused the problem?? HD