I have a 1977 CB550F and it has one threaded grease fitting (6mm) in the middle of the swingarm pivot. I suspect the fitting is the Japanese style mentioned, so I replaced it with a regular U.S.A. fitting (6mm) that I purchased at a cheesy auto parts store.
The grease must be old and solidified because when I attach the grease gun to the new fitting, grease is force out between the fitting and nozzle. Is there an effective solution to this without disassembling the swingarm to remove the old grease?
I don't feel any side to side movement with the wheel removed but shocks installed. By the end of the year, I will happily send it to HM for a rebuild but for now I would like to perform maintenance and get a chance to ride it a bit.
I haven't created a thread for my project, but I am freshening up a last-plated in '88 w/ 14k miles. After the summer, I plan to rebuild the whole bike.