Just tested my new Engwe y600 scooter. Everything was tight and ready to go out of the box. The only issue that i found was with the seat mount threads being very tight. I shoold have run a tap through the holes. This is when i took the seat mount off and exchanged it for the rear footrest. Took it up some long steep streets without any loss of power. Even rode double with my grandson standing in front of me. This scooter is a beast!! I am now trying to change the finger throttle to read and dispay MPH instead of KM. Does anyone out there know?