Hey CC,
My 07 ec 300 used to rev out to about 7-7.5k and then do the same thing.
I did not go into it much, just checked coil wiring-ok, fuel tap etc - all ok.
When I replaced the original muffler with an Fmf powercore 2 off of a 98 rm the motor instantly reved out to about 9-9.5.
More power everywhere....now very happy.
Cheers Mark
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