[Mike Peters]

Sounds like a fuel issue. You might try cracking open the gas line at the carburetor and turning on the gas at the tank valve to see if you have a good flow. If gas gushes from the carb line, then remove the carburetor and clean it thoroughly. The inlet screen could be partially plugged. Tom Endy has an excellent article on using the lowly paper clip to clean out internal Zenith passage ways without removing passage plugs. I tried it and it works. Good luck