2022 Yamaha TT-R50E 2022 Yamaha TT-R50E Our littlest TT-R boasts big YZ styling, four-stroke power, a three-speed automatic-clutch gearbox and it even comes with push-button electric starting. So go ahead... play in the dirt! Features may include: ENGINE An air-cooled, 50 cc, SOHC, 2-valve, 4-stroke powerplant produces smooth, reliable, novice-friendly power that will help ease new riders up the learning curve. Convenient, push-button electric starting makes learning to ride much easier. Compact engine cases. Proven, 2-valve cylinder head design. Intake & exhaust valves feature special "carbon cutter" valve stem design. Automatic ratchet-type cam chain adjuster. Lightweight crankshaft design.