I did a service on my rear shock before a week.
I cleaned it ,changed the oil and reload it with new nitrogen.
The way to reload it is to make a hole and put a valve.
The valve has the same diameter with these on the tires.
Here in Greece we have at some gas stations nitrogen for the tires.So i did the job at a gas station.
For beginning i put 35psi but i can load it up to 60psi if it needs.
So i will leave it for now with 35 and see in the future if it needs more or less pressure.
The way to reload it is to make a hole and put a gas valve.
I-factory in Japan sells a kit with a valve for this job.
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Owner of : Honda NSR250 MC28 95sp colours / Honda NSR250 MC18 R6K SP / Honda RS250 NF5 89 in boxes
/ Honda C50 12V cub / Honda C50 12V super cub Japanese version /Yamaha XT600 89 benetton