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No markings on jets indicates a jet kit was installed. In your case, sensing its running rich...which size mains would you then choose?
Thus my choice to use (marked) Keihin jets only, never opting for UNMARKED, far east jet "kits" EVER.
Complicating your issue, internal measurement of your main jet followed by Keihin replacement is now called for, if not imperative.
For now...concentrate on the valves, one hurdle at a time. When ready, I'm at your call.
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