Keihin needle jet [Press fit ]. Original jet will need to be pulled out. Nickel plated for extra resistance to wear, longer service life. This is the jet in the base of the venturii. Not available from Keihin or Kawasaki [no part number, not shown on parts list] Wear in this part causes rich running in the midrange, common problem with the ZZR1100 ZX-1100.    This is NOT 13091-1698, whick is simply an emulsion tube and main jet holder

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