ORIGINAL: Nitro Fumes
Once in tune, it stayed in tune. You only had to tweak the high end a little bit depending on the ambient temp. Cool weather you run leaner than warm weather. I just kept my engine so it would run at 285ºF. None of this tune, refuel and tune again.
Thats seems to a little high especially if your not racing. The .21 engines shouldn`t go past 280 tops . You will get a lot longer life out of it if you kept it around 250.