I have now put a cline regulator in mine to improve the general running of the engine. I also took out the stock tank and installed an 11 1/2 ounce bubbless bladder tank from Central Hobbies. ($18.00). I did this to be able to place the tank closer to cg, and to be assured a good fuel flow regardless of the attitude of the plane. I placed the cline regulator on about a 1.5 inch length of tubing curving back and into the area underneath the carb. (Remember, the engine is inverted. This would be the area above the carb if looking at an upright engine.) I have not flown the plane yet, but I will post some good info on it when I do.