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i got bug and tar remover sprayed the crap out of it while twisting it back and forth... then sprayed white lithium grease in both cables twisting it some more... now its shooth...
If the bike has been over on its right side (as my 900rr was) it may have a bent clip-on, which would cause the throttle tube to bind. Not saying thats what's wong, just an option to check. My brother's 1992 600F2 had just needed the cables lubed
If the lube is a heavy wax that may cause it to stick worse... I'd go with an oil based cable lubricant and blow it into the cable liner with compressed air.