Hi, this is Russ, I'll be helping you with your problem today. THANKS! How long since it was last run?
If it was a long time as I suspect, MAKE CERTAIN THE FUEL CAP IS VENTING the hole in the cap must allow air to flow through. If that is not it, remove the carburetor, disassemble it and SOAK IN CARB CLEANER OVERNIGHT MINIMUM, then reassemble with a carb kit from the local dealer. NOTE: BE SUFE TO TAKE DIGITAL PICTURES OR DRAW A DIAGRAM OF ALL LINKAGE AND PARTS SO REASSEMBLY GOES WELL! THANKS