Have a Echo ST 2620 Extreme Have had it 3 or 4 years. Allways started right up and still does but once its warmed up will stall right out on restarts and have to prime the bulb and choke it to get it to restart. In the past would start right up on 1st pull. Cold start is fine just the restart once you shut it off. Runs fine once started only problem is the warm restart Any Ideas ?? Thanks Glenn