Your other option is to get 1 or 2 mc18 sprocket carriers, cheap enough on that there auction, instead of the lugs being pressed into the sprocket, they screw into the carrier with a nice big allen key, making it much easier to change sprockets, this is what i do, with no probs. give it a go see how much easier it is.
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Proud Father of , 05 ktm 400exc supermoto 2018 honda crf rx supermoto