So i need a little guidance my engine has about 2 gallons on it and ran awesome i swtched to an 053 pipe and it ran stellar for 2 tanks and then it went south it leans itself out will run 2 laps and i can turn the hsn 1 full turn out and it will run fine for 2 laps and the go lean. I have taken the motor apart and seald the backplate carb and pinch bolt still the same thing i have changed all the fuel line and everything i also put a different motor in and it ran fine i am at a loss any help woulb be appretiated also all the o rings look ok and there is good tension when i turn the needles