The traditiona method for lubing a throttle cable is to disconnect both ends & put the pedal (the lowest) end in a plastic baggie. Then fabricate a funnel out of typing paper & masking tape & tape it securely to the throttle end of your cable. Fill the funnel with some motor oil. Set it upright and wait for oil (and likely, water, dirt and rust) to make it into the baggie in front, thus proving that the whole cable is oiled. Let it drain from bolt ends until you get no more slop out, re-hook it up and you should be good-to-go. Worked on my Pantera and countless motorcycles over the years.
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