Hi guys let me try this again, I have a 16 HP OHV Murray lawn mower with a non adjustable carb. it would only run and cut with the choke partly engaged. The filter is ok, plenty of fresh gas. I took the little plastic insert with the small orifice out where the gas goes into the jets, with it out the mower runs ok without the choke, just a little rough. I have cleaned out the jets with a stran of electric wire, the mower is about 12 years old but very few hours, what am I over looking. Your help is much appreciated.