Hey there, I just bought the same model leaf blower off Craigslist and it has the same symptoms. Getting full throttle with the choke off is nearly impossible, but at half choke throttle response is fine. The guy I got it from said he just used it at half choke 'cause that's the only way he could get it to run for him since he got it new, he only used it for a couple of hours and got a bigger one as a gift shortly after. This thing looks like it too! It's brand new, but I'm a mechanic with plenty of ambition, but very little small engine experience and wanna get this thing figured out. Any ideas outside of the fore mentioned?