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2007 Troy Bilt 13AN77TG766 with B&S 17.5 OHV Itech 31C7070603 E1 I have had this machine for 2 years strong engine till it blew head gasket. I changed head gasket and ran 2 or 3 hours and blew another gasket I could wigle piston so I tore it down honed it out and replaced piston and rings...