A 520 chain is lighter, less rotating mass, so it's possible to pick up some HP. Plus, a 520 chain and sprocket set is cheaper than the proprietary 525 size that came on newer ZX7's, easier to get and there's more variety in the ones available. I'll be doing the same (once the parts arrive). Got an RK 520SHO and 15/43 set for $100.
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