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2018 KYMCO Mongoose 90S, 3 Yr warranty thru 06/30/2019 2018 KYMCO Mongoose 90S The Mongoose 90S offers parents variably controlled speed settings for maximum confidence and instant adventures for the young guns. A youth-sized sporting ATV with moderating parental control, the KYMCO Mongoose 90S is a slick sport-quad with credentials for beginners. Powered by an air-cooled, carbureted 89cc, 4-st...