Honda XL500 Episode: pilot
Another early "S" model Honda XL, again I think 500.
Triumph Bonneville T120 R Episode: Pilot
Triumph Bonneville T120 R minor vehicle
Twin carb Triumph with pancake air filters, T120R Bonnie anyone?
BSA Unknown Episode: Pilot
BSA Unknown minor vehicle
Based on nothing other than the curvature of the headers, I'd say there's a big BSA twin in there.