i have seen few of those burned iginition stators (ec and exc:s).
all tree had a similar problem on the stator coil .
the black coil was bubbled and they didn`t take full rpm:s on WOT.
I think you have the problem in the carb or the reeds.
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04 ec300 --> 05 ec300 --> 06 ec300 -- 07 ec300
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