This problem sounds very familiar to one i had with my ZZR250, though it was never that severe. It used to splutter and lose power when it was hot. My mechanic said it was worn needle float valves, and very common. Dont know about the ping noise though. Try looking for a 2nd hand but newer carbie on trademe, or bite the bullet and get new parts. But take it to a garage first and ask them to diagnose it for you.
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