Virago1959

Hi I'm in the VSOC and one of our members has a very perplexing proglem. He has a Dragstar Trike. After being on a ride-out, after a while the clutch slips and doesn't drive the bike. If left to cool for half an hour, all is OK again. We have broached the possibility that the Oil is becoming too viscous and allowing the clutch to slip when the oil is too hot, and suggested maybe an oil cooler. I have asked if the bike ever had anything like slik50 put in - not to his knowledge. Any Ideas?