No and no. By shift sensitive, do you mean you get neutral when trying to shift from 1st to 2nd? If so, eliminate the obvious stuff first. Make sure the shifter isn't catching on anything, and maybe try a different tranny oil, eg 10w40 motor oil. Also, shift forcefully - give it a good stomp when going from 2nd to 1st.
The hesitation off idle sounds like a jetting issue. Have you had a look at the
carb tuning article on the justkdx site?
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