THANK YOU FOR YOUR ADVICE. HAVE FLOWN THIS EVENING AFTER ADJUSTING THE HIGH SPEED NEEDLE HALF A TURN RICHER. THERE WAS A VAST IMPROVMENT. IT DIDN'T STALL OR OVER HEAT. THE HIGH SPEED NEEDLE IS TWO CLICKS OFF TWO TURNS OPEN .PUT TWO TANKS THROUGH WITH NO PROBLEMS.STILL SOME FINE TUNNING TO DO BUT IT LOOKS LIKE IT MIGHT BE SORTED. THANKS AGAIN.