Join Date: Nov 2010
Location: Mulberry, FL. USA
…...I have a newer '90 KZ750 called the Zephyr and has Keihin CVK32 carbs. These carbs have 3 fuel openings facing the bowls: The Main Jet, the Pilot Jet, and the Starter Jet. Of these, only the Main and Pilot jets are screwed-in replaceable. The Starter jet is a pressed-in insert non-replaceable which looks flat. I believe this is what you called 'empty'. Your carbs may be older CV32s or Mikunis.
The Starter Jet is for ..well...starting the engine. The Pilot is for low RPMs,...and the Main and needle take over as the revs climb.
Last edited by Hugojose; Today at 05:10 AM.