I know how important it is to have as much useful information about your appliance as possible so that it is easier to find replacement parts and part numbers. While you are waiting for an expert answer, I did manage to find a link in where you can enter your model number and the owners manual from the Manage My Life website. Hope this helps!
If there are mixture screws on your carburetor (some don't have them) then turn the high speed screw all the way in until it stops. Do not force it when it stops as this will damage the taper on the end of the screw. Once the screw is all the way in, back it out by about 1-1/2 turn. Then start the engine and tune it out 1/4 turn at a time until you get it to run smooth.