More than 4,000 Toro riding lawnmowers have been recalled after reports of faulty coolant overflow containers on the machines becoming over-pressurized and spraying hot engine coolant on operators.There have been six reports of people suffering burns in accidents involving the defective mowers, the Consumer Product Safety Commission said. Each year, defective lawn mowers, garden tractors, and other similar tools and machines account for hundreds of consumer injuries or deaths. Defective engines