Hey guys So I'm really at my wits end with my 2013 yz450f . I changed my spark plug to the cr8eix, replaced my idle/hot start plunger and cleaned the throttle body. I fired her up 2-3 kicks and warmer her up before killing. I geared up and tried to start, nothing. I felt a kick back 1 or 2 times after kicking through the stroke. I then push started her to get going, but she would not start any other way throughout the entire day. What old be wrong? What am I missing out?