2005 Yamaha TT-R90E, Used Motorcycles for sale Columbus, OH Indepen, Fun mini dirt bike! - The smallest member of our four-stroke family of off-road motorcycles. The TT-R90E. Air-cooled, 89cc, 4-stroke engine puts out smooth, reliable power perfectly suited to the smaller novice rider. Convenient electric start. A smooth-shifting, 3-speed transmission with automatic clutch (designed to ease the beginner into the basics of shifting) helps make riding simpler. CD ignition system delivers hot, reliable spark and requires minimal maintenance. A low, 24.6" seat height provides handling-enhancing low center-of-gravity and allows most riders to put both feet down for added confidence.