I had something similar myself a couple of weeks ago, Aldo. My bent-shaft trimmer needed choke for about 15 minutes after cold start, with the carburetor settings optimised. One of the carburetor insulator gaskets looked pretty crummy, though not cracked or with pieces missing, just had some surface ripples. I squeezed it between a couple of flat plates. Tried 1 ton and it wasn't flat enough. Tried 2 tons and it looked flat. I didn't want to go further because gasket material just flows like butter when you put it under a press. The snipper now starts easily and runs well. It still needs choke for a hot restart, but only until it fires, then it runs very nicely unchoked. It still won't idle slowly enough to disengage the clutch, so the gasket is probably still leaking very slightly, but it has become a pleasant machine to use, which is quite a change.
Carburetor insulator gasket air leaks are a common source of trouble on engines that have flanged and bolted, gasketed intake pipes that have been dismantled at some time. Briggs had a better idea, on their small side valve vertical crankshaft engines, with the O ring seals they use, but of course that means no insulator, so less power from the engine.
If your final test on that blower isn't satisfactory, please bring us up to date. If I don't hear from you I'll take that as good news and close this thread.
