well i decided to go fly the modeltech magic today and the st51 just did not want to run good. It starts easy, but has no throttle response, basically one speed, and the high speed needle does not adjust it at all, basically half power throughout any throttle position and runs very rough. this motor has not been ran in over a year, but i let it warm up through a whole tank. compression is not the greatest, if i turn in slow i can feel a lot of blowby, would that explain the problem? i changed the rings about 3 hours of running time ago. any help would be appriciated