this is my first ever bike I put together. predator 212cc engine. I start my minibike , put it on run and go to twist the throttle and it revs and gets louder like a working bike should but it doesn’t move .if I lift up the back of the bike the back tire spins by itself because it’s on the run setting like it should but when i gas it it won’t move . even if I push the bike myself the back tire chain and all that moves but not when I gas it? it all worked before, i go to sleep, wake up and now it’s not. help?