I have a suer tigre 2300 and i am having a problem with it. I cant get the top end to hold in vertical. I am running it on 15% nitro with a 18x8 prop it will run fine when it is level on the ground at full throttle but when i point the nose stright up it dies. I will die running rich or lean i have tried all diffrent needle positions i have checked the furl tank for air leaks and there arnt any. Anyone have an idea?