Lube the cable before you try anything else. Spray WD40 in and leave overnight. Then make a funnel with tape or card and tape it to the cable, support it upright, fill with light oil, and leave overnight. Or, buy a cable oiler. I bet that is it.
PS I had an RD250 in 1979 and an RD400 in 1982.
"May all your traffic lights be green and none of your curves have oncoming semis in them." Rocky, American Biker.
"Those that give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." Benjamin Franklin, 18th C.
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