Thanks Kraivuth,

To be honest, the last time that I calibrated this engine was over 1 year ago. The only real change in that time has been a new reciever when I converted to 2.4ghz.)

I know you (PST) reccomend the engine is calibrated on a regular basis, however, as it has been performing so well for the last 3 years, I have never bothered with doing it regularly.

I will do this calibration check, and then do some more ground running to ensure all is good...And, make the calibration check a routine before the first flight of the day...

I am glad you consider it might just be a slight fueling issue, as this engine is otherwise very reliable. I will let you know how it goes.

Thanks again.

Roger P