I now have 2 of these engines, and I cant get either one to run worth a damn! Is there a trick to tuning these? I have OS, Saito and Super Tigers and I haven't had any problems. I think it is in the low end. Not sure about the low end adjustment bar. It moves back and forth, not sure if thats my problem or not? By the way the manual reads it should stay still and I should be able to move it myself for slight adjustments.....someone please help!