not starting

Bought a brand new Coleman BT200X, had a defective front end, got an exchange next day. Got the new one put together only to have it not start. It’s igniting in the carb but it won’t ignite fully to start the bike itself (sounds like it’s JUST about too). The throttle also wasn’t closing...

I'm not sure whats going on i put a brand new engine and carb and it still doesn't go the new engine doesn't even start i don't know what i'm doing wrong is there a way to install a new engine ? i put oil , it has gas , new spark plug and it makes a bit of a squeak noise. anyone has any advice ...