Free kick offer has expired. Installed the new vent tube, got a new key and installed it, cleaned carb and all is fine. Also picked up a cast iron flywheel for my 3.5 hp briggs so if dthe Tecumseh has another attitude problem, it will be replaced. Dr clone is working fine, string may last longer with the 10 inch saw blade protecting getting too close to a fence post.
Thanks you all.