I have a 22hp V-twin in my 5 year old Ariel’s tractor mower. It was surging and needed to be run nearly with the choke on by the end of last summer. I replaced the rubber gaskets around the carb bowl, jets, and fuel pick-up tube. Afterwards, the throttle ran in the right spot, but still surged. So I pulled it all apart and checked the gaskets thinking I may have crimped something when I assembled it. Everything was good. While I was in there, I replaced the intake gaskets after cleaning the heads surface really well. Changed absolutely nothing. Still surging like crazy. Anyone have ideas or experience what I should try next? Any help appreciated.