Hello guys i have brand new YS140 that has only 4 tanks of gas through it and i have dead sticked my plane in everytime with it. What is happening is after i first start the engine it runs flawless, idles nice and excellerates verywell, If i leave the throttle wide open for anything over 5 sec. it goes lean and dies everytime. I have the motor in a Quique Somenzini YAK-54. I have large fuel tubing through out the fuel system, fuel filter, YS glow plug in it I am running 17-6 APC prop. I have tryed a 18-6 wide blade ,16-10 APc prop also and get the same thing out of it. When it I am done running the plane i go to relieve the pressure in the tank and theres not that much pressure there,there is no leaks in the fuel system anywhere, i have checked that a couple times. My old YS 120 used to have a lot of pressure. Do i need to turn the pump pressure up to fix the problem here? The motor has plenty of cooling access to the motor. If any one has any suggestions i would sure appriciate it.