Ok, so I have been battling the chain for weeks now, finally got the chain aligned and its staying on, however, now I cant get it started, its a grubee gt5, It only starts when I have the choke wide open ( when its closed I cant get it to start at all ) If I peddle like mad and drop the clutch, it starts, but it wont idle unless im peddling and if I give it some throttle, it gives me a 3 second burst of power then it chokes out and dies, whats wrong here? any help would be great, thanks