I had an AC 650 with that Kawasaki V-twin and LOVEd it. The thing rode great and was fast. That V-twin had a wonderful exhaust note. I wish I still had it.
Occasionally we ride in deep water and mud.
Over time the radiator becomes clogged with mud that hardens over time.
Relocation keeps it out of the mud and easily cleaned.
The PVC tubes are "snorkels" for the engine air intake, the belt cooling air intake and exhaust.
The engine exhaust pipe is also modified to prevent water intrusion.