I agree, they all come in a box from china, sticker or no sticker there all the same! as a hobby engine, its a roll of the dice! its how the motor is set up on frame and mounted and tuned and adjusted! unless the claim is, its had extra mods done, such as a few do, to make the engine that much better. from what Ive seen about the skyhawk is, they use the small bmx chain in their kit opposed to the HD 415. I use #41 chain anyway, but other than that there all the same if you ask me! Ive bought many motors from a few distributer's and installed and (knock on wood) have not had a motor failure yet! 3500 miles in year and a half on my first motor and still rides strong, top speed 38MPH!