Hi All:
Thanks for the prompt replies.
The engine is a 1970 OS MaxH .40S. This is the stunt engine with only a rear ball bearing and a plain front bearing.
The fuel runs great in other engines in weather that was 20 degrees warmer. The fuel was 11-11 with 6% more castor oil added and the nitro was 10%.
The temperature was 55 degrees down from the 77 degrees from the last time that it was flown.
The prop was a 11X6 that was replaced by a 11X5. Both wooden props.
The glow plugs were both "used" but ran well in other engines.
The engine ran like a Swiss watch the last time it was used. Same settings today as last flight.
The load is a Green Box Nobler that is light in weight.
I adjusted the needle valve a bit but I always got a great 4-2-4 run but the 4 cycle was rough. The next time that I fly this plane I will use a new glow plug as I have seen glow plugs go bad from the last time that they were used.
![Huh ???](https://stunthanger.com/smf/Smileys/classic/huh.gif)
Respectfully,
Frank McCune