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Oh okay, then that is the OEM Japanese carburetor. Do you have a tachometer? I would highly suggest you get one and set the idle at 1300 rpm and see how it does.

I got it a few years ago, so it will take some digging to find it. It was sold as an OEM carb in a Kawasaki box and says Mikuni on the side. I think it was around $170. It's possible it was a copycat, but it did look identical to the original. I specifically tried to avoid risking a knockoff!

Could you post a link to the carburetor used. I had a similar issue with mine last year and it turned out i was not adjusting the idle jet screw properly... the way to set it like it came from the factory is to unscrew, or screw it in until the engine reaches the highest idle, then adjust the throttle stopper screw to 1300 RPM Those chinese aftermarket carbs are crapshoot if you get a good one or not. I have one on mine that is a KIPA brand from amazon.