When you have such problems (stuttering) first thing to look is at FUEL LINE ! control and remove ALL fuel filters (even those inside tank) I went mad to find a solution, and even ordered a new CDI ....but just in time an "old hand" mechanic told me to feed the bike from a canister ..and the problem was solved : impurities in filters simply reduce the flux , that is enough for normal running, but not enough when the CV cuts in ...the effect is VERY similar to a ignition problem ...but is way less costly and easy to solve ...:-)
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