I have one. The engine is great !! The Gear box is poor. Very noisy, tried adding GO 90 and it made it worse. The oil made it only slightly quieter, but then the clutch slipped with oil. so.. I drained the oil, the clutch quit slipping, but it is back to being super loud !!! I can not hear the engine the Gear box is so loud !! It is embarrassingly loud. I quit riding it with only 90 miles on it. I have heard some say the gear box gets a little quieter after a few hundred miles. I am not sure of this since I quit riding mine. I am not sure if it gets quieter for those folks or if they are going deaf from the loud gearbox. It was then I then decided to pursue other avenues using 4 stroke engines. Thanks.. Enjoy the ride...