GY6 149cc Scooter Won't Turn Over

[XauroraRAIN]

I've seen situations where the flywheel needs two full revolves before the valve clearance can be adjusted, even though the Mark's are aligned. I know with one of mine, if I turn the flywheel just once to the mark, it doesn't move the springs. I have to turn it around again. Trying to adjust the valve in that state will cause the rocker arm to be very tight against it and it wont move. After you adjusted it, did you turn the flywheel and try wiggling the rocker arm to see if it moves freely? Assuming that it worked fine before you adjusted it and that's all you've done, I don't see many problem ideas.