hey all i just bought a lifan 140 off one of the members here and after i put the new oil sling on it i put it on a engine mount wired it up and started it , works great but thge sprocket is moving when it is in neutral its tight and its as if its in 1st but its in the right gear if that makes sence. i have no idea on how to correct it and i don't want to go pulling it apart if i don't know how to fix it, has anyone else had this problem before? can anyone help me please?