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Speed ball 1 has a good answer, venting sounds like the issue. Go with that

There is a notch in the stem that the handle goes on to. If the notch is at the top side, the cartridge is turned on, turn a half turn and install your handle

Sounds like there is a valve that may not be open all the way some times that creates a vibration when water passes through

I have a 1980 kx 80. The bike starts within the first few kicks and idles fine on choke. I let it idle down until it comes to an even smooth idle, and the pipe is warm. I push the choke in and it...