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This is just a little bench running of my OS .91HZ-R. The running of this engine changed considerably after coming back from having a Center Glide Bearing installed and was very unreliable in my helicopter. A quick trip the the bench gave me a better feel for how this engine runs and how the needle need to be set.
All that is left is to re-install it in my toy and see how it goes.
I should add that my hobby is models and not photography.... Not the best production value but I'm trying to get better.