I had problems with surging on my 6 year old GCV 160 on my Toro lawnmower. I did the usual things but ended up ordering a new carb from Amazon. It’s identical and after installing it, the mower works perfectly. I dropped the bowl on the old one and it is absolutely clean. The mower has an automatic choke that is separate from the carb and I did not touch it. Here is a pic. Old carb is on the left. Anyone have any tips on inspecting the old carb?