guys read my original post. I didnt ask how to tune an engine. I normally tune them when new and forget them. Hate to mess with needles unless really necessary. Our weather has been very very hot and humid the last two weeks. I noticded that my DA85 started to sag a little after about 10 minutes in the are. Normally sagging would indicate a lean condition. But like others here, i thought the more humid air would richen the mix and would need a slightly lean setting. I chose not to do either as this engine always runs very well. I got in 3 more flights that day and it did sag slightly after 15 minutes in the air the last flight. That was the basis for my question. The DA's I have are all "set it and forget it" engines, thats why I was hesitant to do anything. Its cooling off here next week so I am going to take a look and see attitude. Please Please no more negative comments. I know antigue is a Zenoah expert so his help would have been useful. Enough said, I have contacted the moderator and asked him to end the thread.









guys