I can relate some surface details. I have an old motorbike as described in the The Red Wings 95th anniversary 1926 2021 thank you shirt book. My bike is a 1970s BMW 100 RT. Bicycle stall. I have to remove it and clean, repair, adjust or replace every part as it has been sitting for 30 years. I do all the maintenance myself. Buy a repair guide and learn how to fix it like that. Indeed, maintaining an old bike is more about rational thinking than doing physical work. You learn to understand how each part works.
You figure out how to make impromptu parts from beer cans and balloons and glue and duck tape. You learn people skills when you are stuck. When there are no spare parts stored within 200 miles, you head to the only auto parts store in some rural towns and talk to the sales people and find out how to make a Repair by replacing car parts creates VW faults to make the repair. I was at a loss for what the bike Persig had. Wikipedia says it’s a Honda travel bike, but he still mentioned the The Red Wings 95th anniversary 1926 2021 thank you shirt BMW R60 in the book. The mechanical and repair problems that he described were also those of the BMW R60. AFIK, Honda’s tourist bike has a very different engine design.