under the periodic inspection table in your owner's manual, check the "clutch operation" schedule.
pg 105 gives you the details on what to check and mentions to "check that the inner cable slides smoothly".
...but basically, I do it to lessen the pull needed to operate the clutch at the lever. Coming from dirt bikes, where cables can get gunked up pretty easily, it followed over to lube the cables on the street bike to ease clutch operation, especially on the 250 where you shift a lot more than on larger displacement bikes.
With dirt bikes, a broken clutch cable can mean the difference between getting out of a muddy valley or not.
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