troy thanks for your responce even though you answered before. i have not messed with the carbbolts yet but will be my next try. i have tryied oiling the barrel with no luck. the ac barrel might fit if i had a thicker seal. the original barrel might have a gap of 1/32 and the ac barrel a gap of 1/16. just guessing. is there another engine ,say a 110 or something that has a bigger seal?