Just to add to my last story of the mechanic who told me I needed a new carb for my Husky 272XP due to a leak behind the high speed screw. I put another air filter on it and put my old carb back on after replacing the carb kit and adjusted the high and low and it ran like a new saw. I went back to the mech and he actually refunded me 233.00 for parts and labour and wanted to make sure I was satisfied. Happy Ending. Dolmar 7900 on hold! Thank you sincerely to everyone who responded to my posts. You were all very helpful. I hope I can be of some help to others on this site.