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Check that the 'Round' & 'Square' location pegs of the rotor are not catching on the weights of the advance mechanism, I just checked a new MSD I have here for an FE and the mech advance would not function for this reason, a quick trim with a craft knife solved the problem ( only required the tiniest amount removed ), In your case it may only be one weight caught which would explain the 14° instead of 28°.
Rotor fitted 1/2 turn out of phase ;ie square peg in round hole could cause same problem.
Jac Mac
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