Flew my BME 50 GP Patty W. today for the first time in a yr and half. Could not fly the big planes due to a back injury last summer and then had to have it operated on this year. Anyway plane started up just fine, but transtion from low to full was slow. Engine did not bog down but hesitated noticably even after a few flights. Engine has three gallons threw it, running a Menslik 22x8. In air engine poped some at idle but never died. The engine would also tick over very nice and slow at idle.