the stock chain on the zr 600-01 20-39-70pitch, zr 600 efi 22-41-72 pitch,zl 600 efi 22-41-72 pitch and zl 600 efi esr 19-39-70 pitch. for the chain to fit 18/39 70 would be the choice of chain. 18/44-72, 18/40/70, 18/39/70, 18/3768 chains. hope this helps you.
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