Wait what, sorry been away fro a while but do you mean I am running it over compressed or under compressed?
If you are referring to the black stuff on the tank that is not burnt oil, it is what's left of the paint that someone put on the tank.
It sounds like it's running slow?
That's because it is, it is running a 7x4 APC prop and rich.
Since the video was taken I have played with head shims and eventually settled with how it was in the video originally , one above and one below the disk so far I have put around 30 minutes of run time on it and checked inside and all looks good so far.
By no means am I telling people not to buy Davis is Cox HD cranks as they are great and good for high rpm glow engines too, I am sure a smaller prop and the crank would break but what I wanted to see is if I could get it diesel, not run a small prop.
May have to fly it soon