The water cooled bike looks like a 50cc E13, not a B1 or C1. That rear arm is scary for twice the hp of a Cag. If you have a welder, you might add another tube from the upper frame down to the back part off the rear arm for strength.
I have 3 house compressors..One I made for the hobbyroom out of an airbrush compressor and a Mapp gas bottle with coil hose to quick fill pocketbike tires.............Heres my other bigger house compressor...I just had to order a new air compressor, today from H/F Tools, 2.5 hp, 125 PSI, vertical 21 gallon tank, and about 5 cu ft a min. 90 lbs. Onsale $149.99 or something. $12 CA. tax and $21.94 S/H, or $183.93 to my door. It would cost me $20 to drive my truck 75 miles so I will let FedEx handle it, my old 2 hp motor gave up.