I JUST PURCHASED MY FATHERS HANGAR 9 ALPHA 40 TRAINER OFF HIM IT ONLY FE LIKE 6 TIMES LAST YEAR. WE WERE TRYING TO FINE TUNE THE MOTOR THIS AFTERNOON. AND WE COULD NOT GET IT SET RIGHT AT ALL. WE THEN NOTICED AIR BUBBLES COMMING FROM THE HIGH SPEED NEEDLE VALVE WHICH IS LOCATED AT THE BACK OF THE MOTOR CARRYING FORWARD INTO THE CARB CAUSING IT TO RUN IRRADICALLY AT FULL THROTTLE AND RUN VERY LEAN. WECHANGED ALL THE FUEL TUBING, AND OPUT SOME FUEL TUBING AROUND THE NEDLE THNKING MAYBE IT WAS SUCKING AIR. WE JUST GOT BACK FROM RUNNING IT AGAIN AND NOW THERE ARE AQ TONE IF LITTLE AIR BUBBLES COMMING RIGHT FROM THE FULE TANK LINE TO THE HIGH SPEED NEEDLE. WE KNOW THERE MUST BE A PROBLEM SOMEWHERE IN THE FUEL TANK BUT IT IS NOT LEAKING AT ALL AND NONE OF THE LINES APPEAR TO BE TANGLED OR ANYTHING. IF ANYONE OUT THERE IN RC LAND COULD GIVE ME SOME INSIGHT AS TO WHAT COULD BE WRONG IN THE TANK TO CAUSE SO MANY BUBBLES IN THE FUEL LINE THAT WOULD BE GREAT!...ALSO FOR REFERENCE THE MOTOR IS THE EVOLUTION .45 POWER TRAINER SYSTEM. THANKS IN ADVANCE TO ALL WHO MAY TRY TI HELP IN REGARDS TO MY PROBLEM!