Also, before troubleshooting more complex carb issues did you service the enricher/choke “management system” aka cable and lever? May be they are sticky. Mine were in a poor state. I completely disassembled the lever housing cleaned it up and lubed the area where the lever slides with a bit of silicon grease. Sprayed cable lube into the cable housing using the cable lubrication contraption which cleaned the staff out and lubricated it. I have also removed and lubricated the enricher slide. Then checked the cable tention and slack. Our ZZRs I believe have the cable length adjustment built intk the canle housing. I think its located under the tank. Just make sure your cable opens and closes the enricher valves properly. After I did mine it works way better, I can adjust almost in 1000 rpm increments when its cold.
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