Feedback from this side of the planet:
The nut for the front sprocket for the N250, N300, N650, N1000, Z1000 and ZX10 are all difficult to remove. It's like they're spot welded on. The dealer's shop even asked me not to bring it to them when I want to change the front sprocket.
The best way to remove it manually is to use a 6 foot lever. A buddy uses a Pneumatic impact gun with 800lbs.of breakaway torque. He says it works like a charm.
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