Regarding working on our motorcycles, I find general maintenance is something that has to be done. But a complete rebuild bringing something back to life, which may require modifications where parts are unobtainable, or to improve things mechanically gives me pleasure and satisfaction. I am fortunate in having a reasonably well equipped workshop, but do not have cylinder boring or shaft grinding facilities. I have recently made a new cylinder sleeve for my 175 Mondial rebuild, but had to farm out the boring. The big end also required attention, the crank pin was worn, but the rod eye was ok. It initially had 3 mm needle rollers, after some calculations, I sourced some 1/8" rollers, and had the crank pin ground to suit, it all worked out well.
There is still lots more to do, but things are on hold at the moment, as SWMBO has me on decorating duties," deep joy."