i did this mod to my 1974 honda TL-125 when i was 15. my metal shop teacher let me use the machinist lathe at school to center drill and thread the fork caps for air valves. the results were fantastic.
Interesting that the bike in the upper pictures has a control switch mounted on the lower part of the bars below the cross brace, and the kill switch on the control looks a bit like a Honda switch. I added air fittings to one of my CB750s (a K3) back when I worked at the last Honda shop before going to the Police Garage job in '76 and it rode nice. At first, I only added air over the stock springs, but later I took the springs out and ran on air only at about 65 lbs IIRC. It always topped out the forks when parked on the side stand, and the guys I worked with started calling me "chopper" because it made the forks look like they were extended a bit
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