Originally Posted by BLC1
i took them to my mechanic and they cleaned out the carbs and mufflers. One is working fine and the other went back in already. I think all five units have broken pull cords of some kind. A few of them the string broke and a few the cord would wind back up. This problem has to be the guys yanking them way to hard.
Pull start unit is easy, only have to take out 4 screws at the back to remove it. Buy yourself a few of the pull start unit and change it yourself next time.
You try switching gas yet? Multiply unit have the same symptom got to have a common denominator. I really don't believe is oil, chances are high it's your gas. I use Shell 91, but we are in different state. Chevron here smell very sweet alcohol like to me.