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i think its 5/8" actually. i leave the tank on but have the fairings off. i just use a 5/8" spark plug tool (which has a rubber grip to grab the plug) and a short 3" extender, i put the plug tool on the extender and put it down there, then click the ratchet on. once its loose, i click off the ratchet and take it out by hand.
i also just use either a pair of channel locks, or if i'm in a pinch a hammer and a chissel for tapping the preload adjuster. but people give me **** for that.
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