Buy a Brand new Kohler Air Filter and Pre Filter for your engine. The part number for this item is KP47-883-03-S1. However, this part has previously gone by part numbers KP47-083-03-S1 and 47 083 03.
This is a genuine part supplied by Kohler.
To Service Kohler Engine Model: Command Pro Twin CV17HP - CV25HP
You will need this Air Filter/Pre Filter and
Oil Filter, part number: KP12-050-01-S1
Fuel Filter, part number: KP25-050-22-S
Spark Plug, part number: BCPR5ES