I bought a new lawnmower last year for home and it has a briggs 5.5hp motor. It worked great for the 8 months that ive had it but i pulled it out to start it this spring and it wouldnt start. I noticed that the choke was closed so i got my daughter to hold it open a bit while i pulled the cord and it roared to life first pull. It doesnt have a visible card and the sring open the choke is connected to a small shaft that disappears into the motor housing. Any help with this one would be great. My small engine knowledge is lacking. Should something be opening the choke when i start it? Am i looking at tearing this thing down further, and if so does anyone know where i can at least download a manual? Thanks in advance.