The original front sprocket has a rubber liner on the inside to reduce ringing vibrations. Are the rear wheel spacers in the proper sides. FWIW I have 98 C1 ZX9 that I still have owned since 99. If the rear cush drive rubbers are worn you should be able to rock the sprocket carrier back and forward, they make a squashing popping sound at low speed if they are worn, and you wont hear them at higher speeds reacting to torque torture. Can you put it on a paddock stand, well tied down and run the revs up in gear to listen for the noise. Another option is to be pushed on the road in neutral so the chain and wheels are rotating. We used to achieve this by having a mate on another bike pushing us from behind using a straightend leg on the passenger peg as they are not towed and there is no physical connection. We used to get broken trailbikes home this way in our young dumb and broke days while we were still at High school
When bearings make noise they tend to run hotter, so if it is not gearbox output shaft related something must be warmer than usual. Also check the rear brake caliper pins.
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